CN108254594A - The alternating temperature hysteresis fixture and test method of material under a kind of high electric field - Google Patents
The alternating temperature hysteresis fixture and test method of material under a kind of high electric field Download PDFInfo
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- CN108254594A CN108254594A CN201810065551.4A CN201810065551A CN108254594A CN 108254594 A CN108254594 A CN 108254594A CN 201810065551 A CN201810065551 A CN 201810065551A CN 108254594 A CN108254594 A CN 108254594A
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- alternating temperature
- electric field
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- voltage interface
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Measurement Of Resistance Or Impedance (AREA)
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Abstract
The present invention relates to the alternating temperature hysteresis fixture and test method of material under a kind of high electric field, which includes：Alternating temperature thermostat；On alternating temperature thermostat and the sample cell of liquid insulating medium is accommodated, preparation has top electrode and the ceramic sample of lower electrode to be immersed in liquid insulating medium；It is located at below ceramic sample in sample cell and is immersed in the metal conducting layer in liquid insulating medium；The vacuum chamber of alternating temperature thermostat and sample cell is accommodated, vacuum chamber is equipped with the first high voltage interface and the second high voltage interface；The output terminal of first high voltage interface is connected with top electrode, and the input terminal of the first high voltage interface is connected with the high-pressure side of ferroelectric hysteresis loop measuring instrument；The input terminal of second high voltage interface is connected with the exit of metal conducting layer, and the output terminal of the second high voltage interface is connected with the testing current end of ferroelectric hysteresis loop measuring instrument.The present invention can not only apply high electric field and realize that ferroelectric hysteresis loop during nonlinear dielectrics loading high electric field measures, but also can realize change temperature measurement simultaneously applying high electric field.
Description
Technical field
The invention belongs to the electric parameters technical field of measurement and test of dielectric substance, and in particular, to dielectric substance
Alternating temperature hysteresis fixture and test side of the test more particularly to nonlinear dielectrics of ferroelectric hysteresis loop under high electric field
Method.
Background technology
With the continuous development of nuclear physics technology, electron beam, accelerator, laser-produced fusion etc., Pulse Power Techniques national defence,
The fields such as new and high technology, civilian are used widely, and wherein energy-storage system is the important component in pulse power device.
Capacitor has many advantages, such as fast energy rate of release, output power, combines flexible, technology maturation, is cheap, at present should be
With widest energy-storage travelling wave tube.Two class of the heterogeneous linear dielectric of dielectric material and nonlinear dielectric as impulse capacitor, by
In nonlinear dielectrics dielectric constant with electric field in nonlinear change, therefore can not be characterized with the dielectric constant under small electric field
The energy storage characteristic of material.Energy storage density is the key index for weighing impulse capacitor.
Non-linear dielectric material energy storage density W is represented byWherein, E be apply electric field strength, P
For polarization intensity, PmFor maximum polarization, PrFor remanent polarization, it can be seen that, the electric strength of material is higher, material
Energy storage density it is higher.It is well known that ferroelectric hysteresis loop is to characterize a kind of survey of polarization intensity P and electric field strength E correspondences
Amount means, it is therefore desirable to a kind of hysteresis method of material under high electric field, you can obtain the storage of nonlinear dielectrics
It can density.For the engineer application of impulse capacitor nonlinear dielectrics, the temperature stability of energy storage density is assessed to pass
It is important, therefore enough sufficiently high electric fields of application are needed not only to, while also need to realize in alternating temperature for the measurement of ferroelectric hysteresis loop
Under the conditions of test.
Ceramic material hysteresis method generally use GB/T 6426-1999《Ferroelectric ceramic material ferroelectric hysteresis loop
Quasi static test method》, regulation sample is unpolarized thin slice in standard, and thickness is not more than 1mm, and two main surfaces are all applied
Metal layer is as electrode.It is currently that detected materials are directly measured by ferroelectric hysteresis loop measuring instrument.Impulse capacitor is with non-linear Jie
The applied electric field of material is higher, even higher in tens kV/mm or so, measures the electric field strength applied during ferroelectric hysteresis loop extremely
It is greater than applied electric field less, therefore the field strength that need to be loaded will also reach tens kV/mm, corresponding test voltage also needs to reach several kilovolts
(it is usually 10kV that the highest on-load voltage of ferroelectric hysteresis loop measuring instrument is limited by high voltage power supply or high-voltage amplifier at present).
Using method as defined in GB/T 6426-1999 standards, the hysteresis of material under high electric field, sample are tested
It will appear edge breakdown and lead to not apply tens kV/mm high electric fields.Alternating temperature, especially low temperature ferroelectric hysteresis loop are measured,
Due to the easy moisture absorption of low-temperature sample, frosting, leakage current increases, and application high electric field is made to become more difficult, currently without available
Low temperature, Hi-pot test fixture and test method.
Invention content
For above-mentioned technical problem, the purpose of the present invention is to provide a kind of alternating temperature ferroelectric hysteresis loop surveys of material under high electric field
Fixture and test method are tried, is on the one hand conducive to study nonlinear dielectrics polarization with temperature and the development law of electric field, separately
On the one hand the performance parameters such as material different temperatures energy storage density can be obtained, there is important academic significance and engineer application valency
Value.
In order to solve the above technical problems, the alternating temperature hysteresis of material presss from both sides under a kind of high electric field provided by the present invention
Tool, including：Alternating temperature thermostat；On the alternating temperature thermostat and the sample cell of liquid insulating medium is accommodated, on preparation has
The ceramic sample of electrode and lower electrode is immersed in the liquid insulating medium；It is located at the ceramic sample in the sample cell
Lower section and the metal conducting layer being immersed in the liquid insulating medium；Accommodate the vacuum of the alternating temperature thermostat and sample cell
Chamber, the vacuum chamber are equipped with the first high voltage interface and the second high voltage interface；The input terminal and electric hysteresis of first high voltage interface
The high-pressure side of go-and-return measurement instrument is connected, and the output terminal of first high voltage interface is connected with the top electrode；Second high pressure
The input terminal of interface is connected with the exit of the metal conducting layer, and output terminal and the electric hysteresis of second high voltage interface return
The testing current end of line measuring instrument is connected.
Test fixture according to the present invention, can both apply high electric field, when realizing nonlinear dielectrics loading high electric field
Ferroelectric hysteresis loop measures, and the measurement for becoming temperature measurement, especially low temperature high electric field can be realized while high electric field is applied, for research
Impulse capacitor in practical application has been provided with correlated performances such as the energy storage densities under nonlinear dielectrics temperature match curing conditions
Sharp condition.According to above structure, research material polarization is not only contributed to temperature and the development law of electric field, can also obtain material
Expect outer unit for electrical property parameters off field suffered by reality.And the fixture is also equipped with simple in structure, is easy to the advantageous effects such as universal.
Also, in the present invention, the upper surface of the alternating temperature thermostat is coated with thermal grease conduction.Thus sample cell is bonded in alternating temperature
The upper surface of thermostat.Thermal grease conduction is used to form the medium for transmitting heat, and the temperature of alternating temperature thermostat is promoted to pass to sample cell,
Thermal grease conduction can be APIEZON H fat, APIEZON N fat.
Also, in the present invention, the sample cell is concave structure, bottom thickness 0.5-1.0mm.Sample trench bottom is as possible
Thin, the temperature for making sample cell is synchronous as early as possible with the temperature of alternating temperature thermostat.
Also, in the present invention, the material of the sample cell is aluminium nitride ceramics, thus make sample cell meet simultaneously high heat conduction and
The demand of height insulation.
Also, in the present invention, the metal conducting layer is directly prepared in the bottom of the sample cell.
In addition, the present invention also provides a kind of sides that the alternating temperature ferroelectric hysteresis loop of material under high electric field is tested using aforementioned fixture
Method after the completion of the connection of the fixture, is vacuumized by the vacuum chamber, and passes through the alternating temperature thermostat regulation and control alternating temperature, is treated
After temperature reaches set temperature, start the ferroelectric hysteresis loop measuring instrument application electric field and tested.
Also, in the present invention, the size of the ceramic sample is less than the size of the metal conducting layer.So as to by ceramic sample
Lower electrode is drawn.
Also, in the present invention, the lower surface of the ceramic sample prepares full electrode as lower electrode, under the ceramic sample
The area of electrode is much larger than the area of top electrode.Top electrode area is small, can reduce breakdown probability, improves sample electric strength.
Also, in the present invention, the thickness of the ceramic sample is 0.1-0.2mm.Ceramic sample is thinner, and electric strength is higher.
Also, in the present invention, the ceramic sample is fixed on the metal conducting layer by conductive silver paste.It is achieved in ceramics
The lower electrode of sample and the electric communication of metal conducting layer.
Also, in the present invention, the ferroelectric hysteresis loop measuring instrument can be aixACCT TF Analyzer 2000 or other iron
Electroanalyzer.
According to following specific embodiments and refer to the attached drawing, it is better understood with the above of the present invention and other mesh
, feature and advantage.
Description of the drawings
Fig. 1 is used in the alternating temperature hysteresis method of material under the high electric field according to an implementation form of the invention
The structure diagram of test fixture；
Fig. 2 and Fig. 3 respectively illustrates PLZT anti-ferroelectric ceramic materials under high electric field different temperatures according to an embodiment of the invention
Alternating temperature ferroelectric hysteresis loop measurement result chart；
Reference numeral：
1st, alternating temperature thermostat；
2nd, sample cell；
3rd, metal conducting layer；
4th, ceramic sample；
5th, top electrode；
6th, liquid insulating medium；
7th, lower electrode；
8th, vacuum chamber；
9th, the first high voltage interface；
10th, the second high voltage interface.
Specific embodiment
Illustrate the progress of the substantive distinguishing features of the present invention and conspicuousness with reference to specific implementation form and attached drawing.Ying Li
Solution, these implementation forms are only used for that the present invention is further described, it is impossible to be interpreted as limiting the scope of the invention.
Direction concept as shown below is only for convenience of description, and non-limiting, and when specific implementation can change as needed.
In order to assess the performance of material energy storage density under temperature match curing conditions, the present invention provides one kind can be in high electric field, alternating temperature
Under the conditions of material ferroelectric hysteresis loop test fixture.
Test fixture according to the present invention can measure the ferroelectric hysteresis loop of material under high electric field, alternating temperature, not only contribute to study
The cognition of material phase transformation rule and intensification to phase-change mechanism can also obtain outer electrical property off field suffered by material reality, extension
The application of material has important academic significance and engineering application value.
Fig. 1 shows what is used in the alternating temperature hysteresis method of material under the high electric field according to implementation form of the present invention
The structure diagram of test fixture；Fig. 2 and Fig. 3 shows PLZT anti-ferroelectric ceramic materials under high electric field according to embodiments of the present invention
Respectively in the chart of 23 DEG C and -20 DEG C ferroelectric hysteresis loop measurement results.
As shown in Figure 1, a kind of test clip of alternating temperature ferroelectric hysteresis loop for being used to test material under high electric field of this implementation form
Tool includes：Alternating temperature thermostat 1；On alternating temperature thermostat 1 and accommodate the sample cell 2 of liquid insulating medium 6.Preparation powers on
The ceramic sample 4 of pole 7 and lower electrode 5 is immersed in liquid insulating medium 6.The test fixture, which is additionally included in sample cell 2, to be located at
4 lower section of ceramic sample and the metal conducting layer 3 being immersed in liquid insulating medium 6.The metal conducting layer 3 can be directly prepared in sample
The bottom of product slot 2.Aforesaid liquid dielectric 6 for example can be silicone oil.As shown in Figure 1, it is immersed in sample cell 2 in silicone oil 6
The top electrode 5 for being from bottom to top followed successively by metal conducting layer 3, the lower electrode 7 of ceramic sample 4, ceramic sample 4 and ceramic sample 4.
The test fixture further includes the vacuum chamber 8 for accommodating alternating temperature thermostat 1 and sample cell 2.The vacuum chamber 8 is equipped with the first high voltage interface
9 and second high voltage interface 10.The output terminal of first high voltage interface 9 is connected with top electrode 5, the input terminal of the first high voltage interface 9 with
The high-pressure side of ferroelectric hysteresis loop measuring instrument (diagram is omitted) is connected.Second input terminal of high voltage interface 10 and drawing for metal conducting layer 3
Outlet is connected, and the output terminal of the second high voltage interface 10 is connected with the testing current end of ferroelectric hysteresis loop measuring instrument.
Above-mentioned ferroelectric hysteresis loop measuring instrument can be aixACCT TF Analyzer 2000 or other ferroelectricity analyzers (such as
The RT series of Radiant companies).It all has aforementioned high-pressure side, the two ports of testing current end.
It after the completion of the connection of above-mentioned fixture, is vacuumized by vacuum chamber 8, and passes through alternating temperature thermostat 1 and regulate and control alternating temperature, treated
After temperature reaches set temperature, start ferroelectric hysteresis loop measuring instrument application electric field and tested.In this implementation form, sample preparation requirement is
Ceramic sample is thinned to 100-200um, the electrode fabrication of ceramic sample expires electrode, upper surface small electrode into lower surface.Reduce pottery
The thickness and electrode area of porcelain sample, can improve sample electric strength.Assuming that thickness 100um, electric field requires to reach 40kV/mm,
It then needs to apply 4000V high voltages, therefore the present invention devises special fixture.Sample cell, which can be selected, meets high heat conduction and high insulation
The material of demand, such as aluminium nitride ceramics.The high insulation resistance of aluminium nitride ceramics, it is ensured that apply safety during high electric field.Nitridation
The high heat conductance of aluminium ceramics, it is ensured that by the heat transfer of alternating temperature thermostat to ceramic sample.Sample cell is immersed fluid insulation to be situated between
Matter makes upper/lower electrode and its exit be immersed, and electrode leads to client can be avoided to discharge when applying high pressure.Also, together with
Ceramic sample, sample cell and liquid insulating medium are placed in vacuum chamber, and the frosting of low-temperature sample surface is avoided by vacuumizing, leakage
Electric current increases, and leads to not apply high electric field.
Specifically, the preparation of ceramic sample 4 is first carried out：The size of ceramic sample 4 is less than the size of metal conducting layer 3,
The thickness of ceramic sample 4 is thin as possible, for example, 0.1-0.2mm.The lower surface of ceramic sample 4 is full electrode, and upper surface is small electricity
Pole, upper surface electrode diameter are small as possible.
In addition, one layer of thermal grease conduction can be coated in the upper surface of alternating temperature thermostat 1, sample cell 2 is positioned over and is coated with heat conduction
The upper surface of the alternating temperature thermostat 1 of fat.
Wherein, sample cell 2 is concave, and the bottom of concave is thin as possible under the premise of insulating requirements are met, for example, 0.5-
1.0mm.The bottom surface of sample cell 2 should cover metal conducting layer 3, using the exit of metal conducting layer 3 as test lead and vacuum chamber 8
The input terminal of the second high voltage interface 10 be connected, the output terminal of the second high voltage interface 10 and the testing current of ferroelectric hysteresis loop measuring instrument
End is connected.In addition, the material of sample cell 2 should meet high heat conduction and high insulation, such as aluminium nitride ceramics simultaneously.
Further, the lower electrode 7 of ceramic sample 4 is fixed on metal conducting layer 3 with conductive silver paste, realizes ceramic sample
4 lower electrode 7 and the electric communication of metal conducting layer 3.
In addition, the output terminal of the first high voltage interface 9 of vacuum chamber 8 is connected with the top electrode 5 of ceramic sample 4, wherein, and
The input terminal of first high voltage interface 9 is connected with the high-pressure side of ferroelectric hysteresis loop measuring instrument.
Also, liquid insulating medium 6 is inserted in sample cell 2, with submerge the top electrode 5 of ceramic sample 4 and lower electrode 7 and
Subject to its exit, the sample cell, ceramic sample and alternating temperature thermostat are placed in vacuum chamber.
It after the completion of connection, is vacuumized by vacuum chamber 8, alternating temperature is regulated and controled by alternating temperature thermostat 1, treat that temperature reaches setting temperature
After degree, start ferroelectric hysteresis loop measuring instrument application electric field and tested.
The present invention is further described below by way of specific embodiment and measurement result.
(embodiment 1)
By taking PLZT ceramics (PLZT) as an example, it was known that PLZT antiferroelectric ceramics sample parameters are as follows：In the present embodiment, sample
Product and electrode are circle, sample diameter 8mm, thickness 0.15mm, a diameter of 1.5mm of top electrode.But the present invention is not limited to
This, the shape of sample and electrode may be rectangular or arbitrary shape.
Now according to above-mentioned implementation form, one end (high pressure of 2000 ferroelectric hysteresis loop measuring instruments of aixACCT TFAnalyzer
End) it is connect with the top electrode of PLZT antiferroelectric ceramics samples, by 2000 ferroelectric hysteresis loop measuring instruments of aixACCT TF Analyzer
The other end (testing current end) connect with the lower electrode of PLZT antiferroelectric ceramics samples.
It it is 23 DEG C in temperature, loading electric field is measures PLZT antiferroelectric ceramics under the conditions of 45kV/mm after completing above-mentioned connection
The ferroelectric hysteresis loop of sample, test result are as shown in Figure 2.Figure it is seen that loading electric field can to 45kV/mm, much larger than for
Body material, the electric field value that usual ferroelectric hysteresis loop measuring method can load.In the present embodiment, sample is thinned to 150um, simultaneously will
Specimen electrode, which is fabricated to lower surface, expires electrode, and upper surface small electrode can effectively improve sample electric strength.Then first by sample
The sample cell of design is positioned over, sample cell selects aluminium nitride ceramics.The high insulation resistance of aluminium nitride ceramics, it is ensured that apply high electric field
When safety.The high heat conductance of aluminium nitride ceramics, it is ensured that by the heat transfer of alternating temperature thermostat to ceramic sample.Secondly by sample
Drill traverse enters liquid insulating medium, and upper/lower electrode and its exit is made to be immersed, and electrode leads to client can be avoided to apply high electricity
It discharges during pressure.Furthermore it is placed in vacuum chamber together with ceramic sample, sample cell and liquid insulating medium, is avoided by vacuumizing
The frosting of low-temperature sample surface, leakage current increase, and lead to not apply high electric field.
It it is -20 DEG C in temperature in addition, after completing above-mentioned connection, loading electric field is antiferroelectric to measure PLZT under the conditions of 45kV/mm
The ferroelectric hysteresis loop of ceramic sample, test result are as shown in Figure 3.Less than under room temperature, can load high electric field carry out electric hysteresis
Loop testing.In other words, by the test method of the present invention, the ferroelectric hysteresis loop of material under high electric field, temperature match curing conditions can be realized
It measures.
To sum up, it the present invention provides the hysteresis method of material under high electric field, temperature match curing conditions, not only contributes to
The cognition of research material phase transformation law and intensification to phase-change mechanism can also obtain outer electrical property off field suffered by material reality,
With important academic significance and engineering application value.
In the case where not departing from the objective of essential characteristic of the present invention, the present invention can be presented as diversified forms, therefore in the present invention
Implementation form be to be illustrative rather than definitive thereof, be defined by the claims due to the scope of the present invention rather than limited by specification,
And all changes fallen in the full scope of equivalents of the range defined in claim or its range defined are understood to include
In detail in the claims.
Claims (10)
1. a kind of alternating temperature hysteresis fixture of material under high electric field, which is characterized in that including：
Alternating temperature thermostat；
On the alternating temperature thermostat and the sample cell of liquid insulating medium is accommodated, prepares the pottery for having top electrode and lower electrode
Porcelain sample and electrode leads to client are immersed in the liquid insulating medium；
It is located at the metal conducting layer below the ceramic sample and being immersed in the liquid insulating medium in the sample cell；
The vacuum chamber of the alternating temperature thermostat and sample cell is accommodated, the vacuum chamber is equipped with the first high voltage interface and the second high pressure
Interface；
The output terminal of first high voltage interface is connected with the top electrode, and input terminal and the electric hysteresis of first high voltage interface return
The high-pressure side of line measuring instrument is connected；
The input terminal of second high voltage interface is connected with the exit of the metal conducting layer, second high voltage interface it is defeated
Outlet is connected with the testing current end of the ferroelectric hysteresis loop measuring instrument.
2. fixture according to claim 1, which is characterized in that the upper surface of the alternating temperature thermostat is coated with thermal grease conduction.
3. fixture according to claim 1, which is characterized in that the sample cell is concave structure, and bottom thickness is
0.5-1.0mm。
4. fixture according to claim 1, which is characterized in that the material of the sample cell is aluminium nitride ceramics.
5. fixture according to claim 1, which is characterized in that the metal conducting layer is directly prepared in the sample cell
Bottom.
6. a kind of alternating temperature ferroelectric hysteresis loop of material under fixture test high electric field using described in any one of claim 1 to 5
Method, which is characterized in that after the completion of the connection of the fixture, vacuumized by the vacuum chamber, and pass through the alternating temperature constant temperature
Device regulates and controls alternating temperature, after temperature reaches set temperature, starts the ferroelectric hysteresis loop measuring instrument application electric field and is tested.
7. according to the method described in claim 6, it is characterized in that, the size of the ceramic sample is less than the metal conducting layer
Size.
8. according to the method described in claim 6, it is characterized in that, the lower surface of the ceramic sample is prepared under full electrode conduct
Electrode, the area of the lower electrode of the ceramic sample are much larger than the area of top electrode.
9. according to the method described in claim 6, it is characterized in that, the thickness of the ceramic sample is 0.1-0.2mm.
10. according to the method described in claim 6, it is characterized in that, the ceramic sample be fixed on by conductive silver paste it is described
Metal conducting layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810065551.4A CN108254594B (en) | 2018-01-23 | 2018-01-23 | Temperature-changing electric hysteresis loop test fixture and test method for material under high electric field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810065551.4A CN108254594B (en) | 2018-01-23 | 2018-01-23 | Temperature-changing electric hysteresis loop test fixture and test method for material under high electric field |
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| CN108254594A true CN108254594A (en) | 2018-07-06 |
| CN108254594B CN108254594B (en) | 2020-12-11 |
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| CN1529183A (en) * | 2003-09-26 | 2004-09-15 | �Ϻ���ͨ��ѧ | Experiment apparatus for measuring ferro electric-hysteresis loop of ferroelectrics |
| CN104101792A (en) * | 2013-04-11 | 2014-10-15 | 中国科学院上海硅酸盐研究所 | Ferroelectric material ferroelectricity and ferroelasticity measuring system and method under force field, electric field and thermal field |
| CN106092512A (en) * | 2016-06-12 | 2016-11-09 | 中国电子科技集团公司第八研究所 | A kind of irradiation, thermal vacuum and high/low temperature integrated synthesis multichannel on-line monitoring system |
| RO131658A2 (en) * | 2015-07-08 | 2017-01-30 | Institutul Naţional De Cercetare Dezvoltare Pentru Fizica Materialelor | Method of measuring quasi-static ferroelectric hysteresis |
| CN107402316A (en) * | 2016-05-20 | 2017-11-28 | 中国科学院上海硅酸盐研究所 | The fixture of the ferroelectric hysteresis loop of ferroelectric material is measured under a kind of isostatic pressed |
-
2018
- 2018-01-23 CN CN201810065551.4A patent/CN108254594B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529183A (en) * | 2003-09-26 | 2004-09-15 | �Ϻ���ͨ��ѧ | Experiment apparatus for measuring ferro electric-hysteresis loop of ferroelectrics |
| CN104101792A (en) * | 2013-04-11 | 2014-10-15 | 中国科学院上海硅酸盐研究所 | Ferroelectric material ferroelectricity and ferroelasticity measuring system and method under force field, electric field and thermal field |
| RO131658A2 (en) * | 2015-07-08 | 2017-01-30 | Institutul Naţional De Cercetare Dezvoltare Pentru Fizica Materialelor | Method of measuring quasi-static ferroelectric hysteresis |
| CN107402316A (en) * | 2016-05-20 | 2017-11-28 | 中国科学院上海硅酸盐研究所 | The fixture of the ferroelectric hysteresis loop of ferroelectric material is measured under a kind of isostatic pressed |
| CN106092512A (en) * | 2016-06-12 | 2016-11-09 | 中国电子科技集团公司第八研究所 | A kind of irradiation, thermal vacuum and high/low temperature integrated synthesis multichannel on-line monitoring system |
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| CN108254594B (en) | 2020-12-11 |
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