CN104030728B - A kind of material post-treating method improving pyroelectric property - Google Patents
A kind of material post-treating method improving pyroelectric property Download PDFInfo
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- CN104030728B CN104030728B CN201410275895.XA CN201410275895A CN104030728B CN 104030728 B CN104030728 B CN 104030728B CN 201410275895 A CN201410275895 A CN 201410275895A CN 104030728 B CN104030728 B CN 104030728B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 21
- 230000010287 polarization Effects 0.000 claims abstract description 17
- 230000035882 stress Effects 0.000 claims abstract description 7
- 230000032683 aging Effects 0.000 claims abstract description 4
- 230000005684 electric field Effects 0.000 claims description 13
- 229920000334 poly[3-(3'-N,N,N-triethylamino-1-propyloxy)-4-methylthiophene-2,5-diyl hydrochloride] polymer Polymers 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000010955 niobium Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 claims 1
- 230000005616 pyroelectricity Effects 0.000 abstract description 9
- 238000002203 pretreatment Methods 0.000 abstract description 5
- 238000007669 thermal treatment Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005245 sintering Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910000592 Ferroniobium Inorganic materials 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 1
- 230000004297 night vision Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
Landscapes
- Crystals, And After-Treatments Of Crystals (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The present invention relates to a kind of material post-treating method improving piezoelectric pyroelectric property, belong to pyroelectricity Application Areas; Aging and add stress thermal treatment pre-treatment is carried out to piezoelectric by alternating-electric field, common direct current polarization technique is adopted to polarize to piezoelectric again, the pyroelectric property 20-30% of piezoelectric can be improved, be expected to obtain application at pyroelectric detector production field.
Description
Technical field
The present invention relates to a kind of material post-treating method improving piezoelectric pyroelectric property, belong to pyroelectricity Application Areas; Aging and add stress thermal treatment pre-treatment is carried out to piezoelectric by alternating-electric field, common direct current polarization technique is adopted to polarize to piezoelectric again, the pyroelectric property 20-30% of piezoelectric can be improved, be expected to obtain application at pyroelectric detector production field.
Background technology
Since the Gulf War, night vision (imaging) function of the infrared focal plane array device that US military uses, has startled international infrared scientific circles, has caused the fast development of global range infrared detector development.
Pyroelectricity material is the core parts of pyroelectric detector, its the good and bad effect directly determining infrared acquisition of performance, the pyroelectricity material of application at present mainly contains the stupaliths such as lithium tantalate (LT), TGS (TGS) and ferro-niobium lead zirconates (PZFN).
In recent years, Fang Bijun etc. find (1-x) Pb (Zn of improved Booth encoding growth
1/3nb
2/3) O
3-xPbTiO
3(PZNT) monocrystalline (BijunFang, etal., Growthandpyroelectricpropertiesof [001]-oriented (1-x) Pb (Zn
1/3nb
2/3) O
3-xPbTiO
3singlecrystals, Appl.Phys.Lett., 2007,91 (6): 062902/1-3), the 0.8Pb (Mg for preparing of reaction sintering
1/3nb
2/3) O
3-0.2PbTiO
3(0.8PMN-0.2PT) pottery (BijunFang, etal., Largepyroelectricresponseof0.8Pb (Mg
1/3nb
2/3) O
3-0.2PbTiO
3ceramicspreparedbyreaction-sinteringmethod, Mater.Lett., 2012,84:91-93) there is larger pyroelectric coefficient and the higher thermoelectricity detection figure of merit, dielectric, ermal physics and good mechanical performance, stable chemical nature, is applicable to make pyroelectric detector, is expected to obtain application in Uncooled infrared detection and image device.
Piezoelectric ceramics and piezoelectric monocrystal need to carry out direct current polarization process just can present pyroelectric property, common direct current polarization technique be under room temperature or certain temperature condition, apply a certain size DC electric field polarization the regular hour, piezoelectric itself does not need to carry out extra process, as everyone knows, except developing the novel pyroelectricity material of excellent combination property, exploring new material aftertreatment technology and polarization process, is the effective ways improving existing piezoelectric pyroelectric property.
Summary of the invention
The piezoelectric that the present invention selects is improved Booth encoding growth
lead zinc niobium titanate(PZNT) prepared by monocrystalline and reaction sintering
pMNT(PMNT) pottery, applies alternating-electric field respectively aging and add stress thermal treatment and carry out material aftertreatment, then carries out direct current polarization process with the condition of bibliographical information, adopt charge integration method to measure the pyroelectric coefficient of piezoelectric; Result shows, the material aftertreatment technology proposed by the present invention carries out pre-treatment to piezoelectric, then carries out common direct current polarization process, can improve the pyroelectric property 20-30% of piezoelectric, is expected to obtain application at pyroelectric detector production field.
Main contents of the present invention comprise:
Obtained the coercive field of piezoelectric by ferroelectric hysteresis loop measurement, under low frequency, weak electric field, carry out alternating-electric field burin-in process.
Described low frequency refers to below 1kHz, is preferably 1Hz-250Hz.
The strength of electric field of described weak electric field is the 20-50% of piezoelectric coercive field.
The time of described burin-in process is 10
5more than the cycle, for considering of efficiency and aging effect, be preferably 10
5-10
7cycle.
Described piezoelectric refers to PZNT monocrystalline and PMNT pottery.
The T of piezoelectric is obtained by dielectric temperature spectrometry
0or T
mtemperature, T
0for the Curie-weiss temperature of normal frroelectrics, T
mfor the temperature that the specific inductivity maximum value of relaxation ferroelectric is corresponding, apply 50MPa stress, at T
0or T
mheat-treated 2-4h.
Piezoelectric after pre-treatment, adopts common direct current polarization technique to polarize to piezoelectric.
Embodiment
Embodiment 1:
PZNT95/5, PZNT91/9, PZNT85/15 monocrystalline [001] wafer of improved Booth encoding growth applies 200V/mm, 150V/mm, 450V/mm electric field (coercive field E of PZNT95/5, PZNT91/9, PZNT85/15 monocrystalline [001] wafer of improved Booth encoding growth respectively
cbe respectively 742V/mm, 704V/mm, 1240V/mm) (BijunFang, etal., Successivechangeofphasetransitioncharacterinleadzincniob atetitanatesinglecrystals, JournalofthePhysicalSocietyofJapan, 2004,73 (4): 1090-1091.), under 250Hz frequency, alternating-electric field burin-in process 10 is carried out
5cycle; PZNT monocrystalline after alternating-electric field burin-in process applies 50MPa stress, respectively at 150 DEG C, 185 DEG C, 215 DEG C thermal treatment 2h; The pretreated PZNT monocrystalline of the material aftertreatment technology proposed by the present invention, adopts the condition of bibliographical information to carry out direct current polarization process: in 80 DEG C of silicone oil baths, apply 2kV/mm DC electric field polarization 15min, be cooled to room temperature under the condition that electric field reduces by half.
Embodiment 2:
0.8PMN-0.2PT pottery prepared by reaction sintering applies the 150V/mm electric field (E of 0.8PMN-0.2PT pottery prepared by reaction sintering
c=316V/mm) (BijunFang, etal., Largepyroelectricresponseof0.8Pb (Mg
1/3nb
2/3) O
3-0.2PbTiO
3ceramicspreparedbyreaction-sinteringmethod, Mater.Lett., 2012,84:91-93), under 25Hz frequency, carry out alternating-electric field burin-in process 10
6cycle; 0.8PMN-0.2PT pottery after alternating-electric field burin-in process applies 50MPa stress, at 85 DEG C of thermal treatment 4h; The pretreated 0.8PMN-0.2PT pottery of the material aftertreatment technology proposed by the present invention, the condition of bibliographical information is adopted to carry out direct current polarization process: in 120 DEG C of silicone oil baths, to apply 2kV/mm DC electric field polarization 15min, under the condition that electric field reduces by half, be cooled to room temperature.
The pyroelectric coefficient of the PMNT pottery prepared by charge integration method, the PZNT monocrystalline utilizing computer-controlled PY2 pyroelectricity test macro measurement improved Booth encoding to grow, reaction sintering, temperature measuring precision 0.01 DEG C, charge measurement precision 10
-11c.
PMNT pottery prepared by PZNT monocrystalline, reaction sintering that table 1 provides improved Booth encoding growth applies relevant performance index to pyroelectricity; Can find out, the material aftertreatment technology proposed by the present invention carries out pre-treatment to piezoelectric, adopt common direct current polarization technique to polarize to piezoelectric again, specific inductivity, the dielectric loss of piezoelectric monocrystal and piezoelectric ceramics decrease, and pyroelectric coefficient improves 20-30%.
The performance quality of pyroelectricity material uses the current-responsive figure of merit usually
f i =p/
c v, the voltage responsive figure of merit
f v =p/ (
c v ), detection the figure of merit
f d =p/ [
c v(
tan
)
1/2] evaluate, wherein
pfor pyroelectric coefficient,
c vfor volume specific heat (J/m
3k),
=8.854
10
-12f/m is permittivity of vacuum,
for relative permittivity.The material aftertreatment technology that the present invention proposes makes the specific inductivity of the piezoelectric after polarizing and dielectric loss reduction, pyroelectric coefficient improve (table 1), is conducive to the Pyroelectric response figure of merit improving piezoelectric; The Pyroelectric response figure of merit of PMNT pottery prepared by the PZNT monocrystalline that the improved Booth encoding that table 2 is given by above-mentioned formulae discovery grows, reaction sintering; Can find out, the material aftertreatment technology that the present invention proposes improves the over-all properties of pyroelectricity material, is expected to obtain application at pyroelectric detector production field.
Table 1
Table 2
Claims (4)
1. improve a material post-treating method for pyroelectric property, the pyroelectric property 20-30% of piezoelectric can be improved, and the time stability of pyroelectric property improve, and it is characterized in that: comprise the following steps:
(1) under low-frequency ac weak electric field, to piezoelectric, carry out alternating-electric field burin-in process, eliminate space charge defect;
(2) 50MPa holding force is applied, at piezoelectric T
0or T
mheat-treated 2-4h, eliminates the stress of the aging introducing of alternating-electric field, improves the polarization performance of ferroelectric domain;
(3) common direct current polarization technique is adopted to carry out direct current polarization process to piezoelectric;
Described low frequency refers to below 1kHz; The strength of electric field of described weak electric field is the 20-50% of piezoelectric coercive field;
The time of described burin-in process is 10
5more than the cycle.
2. a kind of material post-treating method improving pyroelectric property as claimed in claim 1, is characterized in that: described low frequency is 1Hz-250Hz.
3. a kind of material post-treating method improving pyroelectric property as claimed in claim 1, is characterized in that: the time of described burin-in process is 10
5-10
7cycle.
4. a kind of material post-treating method improving pyroelectric property as claimed in claim 1, is characterized in that: described piezoelectric refers to lead zinc niobium titanate monocrystalline and PMNT pottery.
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| CN106467411A (en) * | 2016-09-08 | 2017-03-01 | 常州大学 | A kind of material post-processing approach improving NBT base piezoelectric ceramics performance |
| CN106631156B (en) * | 2016-09-08 | 2019-07-09 | 常州大学 | A kind of material post-processing approach improving NKN base ceramics stability and piezoelectric property |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102492991A (en) * | 2011-12-14 | 2012-06-13 | 常州大学 | Lead niobate zincate-lead titanate (PZNT) single crystal material and pyroelectric application thereof |
| CN103601489A (en) * | 2013-08-06 | 2014-02-26 | 常州大学 | Pyroelectric material and preparation method thereof |
-
2014
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102492991A (en) * | 2011-12-14 | 2012-06-13 | 常州大学 | Lead niobate zincate-lead titanate (PZNT) single crystal material and pyroelectric application thereof |
| CN103601489A (en) * | 2013-08-06 | 2014-02-26 | 常州大学 | Pyroelectric material and preparation method thereof |
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