CN107759216A - A kind of method that sol-gal process prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material - Google Patents
A kind of method that sol-gal process prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material Download PDFInfo
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Abstract
The invention belongs to ceramic synthesis technical field, there is provided a kind of method that sol-gal process prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material.Prepare strontium lanthanum manganese oxide i.e. LSMO precursor powders, CaCu 3 Ti 4 O and CCTO precursor powders respectively with sol-gal process, adhesive is added after LSMO and CCTO precursor powder mixing, ceramic body is pressed into after well mixed, it is LSMO CCTO compound magnetoelectric ceramics samples that ceramic body, which is sintered, and obtains strontium lanthanum manganese oxide/CaCu 3 Ti 4 O.Raw material it is cheap, cost is low；Course of reaction component is controllable, prevents dephasign；Gelation time is short；Preparation technology is simple, and the dielectric property and magnetic of ceramics sample all embody very strong regularity.Potsherd consistency is high, the crystal grain uniformity is high.Technique is simple, is easy to industrialized production, the ceramics sample consistency height of preparation, particle uniformity are good, and magnetic electricity performance is excellent.
Description
Technical field
The invention belongs to ceramic synthesis technical field, and in particular to a kind of sol-gel process prepares strontium lanthanum manganese oxide/copper titanate
The method of calcium compound magnetoelectric ceramic material, prepared magnetoelectric ceramic material have high dielectric property and magnetic characteristic simultaneously.
Background technology
The fast development of information industry cause " miniaturization, multifunction, wireless penetration " turn into electronic component development must
Right trend.As the electronic material of electronic component carrier, also conform to this trend and develop to highly integrated and multifunction, it is single
One functional material can not increasingly meet the needs of development in science and technology.Therefore, the research of multifunctional composite in recent years by
Increasing concern.
Dielectric substance refers under electric field action, the material that bound charge plays a major role.Dielectric feature be with
The influence of electricity is transmitted, stores or recorded to the electric polarization mode that positive and negative charge center of gravity does not coincide.Dielectric substance is in itself without certainly
By electric charge, there are good insulating properties.Magnetic is a kind of basic performance of material, magnetism of material can performance and feature it is good
Bad, can influence material can utilize as a kind of basic magnetic material.The dielectric property of material and grinding for magnetic property
Study carefully it is more ripe, if a kind of material can embody dielectric property and can and embody excellent magnetic property, then will
Have broad application prospects.But passing through years of researches, scientific research persons have found that homogenous material is difficult to embody above-mentioned two simultaneously
Kind characteristic, therefore New Magnetic Field Controlled, composite start to receive the concern of people.
CaCu 3 Ti 4 O（CaCu3Ti4O12, CCTO）It is to be found the most typical, most representational 21 century so far
New high dielectric material, its dielectric constant is very high in 100 K to 400 K temperature ranges, dielectric constant fluctuating very little, 1
The lower dielectric constant of kHz AC fields effect up to 10 more than k, its single crystal samples low-frequency dielectric constant be even up to 100 k with
On.In addition, CCTO is not leaded, preparation technology is simple, required preparation condition is simple, get a good chance of substituting traditional dielectric ceramic material
Material, turns into high dielectric ceramic material of new generation.Strontium lanthanum manganese oxide（La2/3Sr1/3MnO3, LSMO）It is a kind of excellent magnetoresistance material,
Curie temperature is very high（T c =350-375 K）, have excellent magnetoresistance characteristics, it contains double/superexchange interaction, electroacoustic
Coupling and the abundant physical phenomenon such as coulomb interaction, and can occur magnetic field or insulator-metal transition that light arrives again, phase separation
And giant magnetoresistance effect, there is very big actual application value, but the research on LSMO is concentrated mainly on magnetic property at present
Aspect, it is less for Study on dielectric property.Therefore, by CCTO and LSMO carry out it is compound after, it is one to study the double characteristics of its magnetoelectricity
Significantly work.
The preparation technology of magnetic electric compound material has a variety of, such as conventional solid method, molten-salt growth method and sol-gal process.It is above-mentioned
Method cuts both ways, and as solid reaction process is simple and easy, but impurity is readily incorporated in mechanical milling process；Molten-salt growth method preparation process
In need to utilize salt washed samples, also easily influence target product purity；Sol-gal process ratio is more suitable for multicomponent oxide
The compound of the preparation and doping of thing, CCTO and LSMO contains a variety of cation elements such as Ca, Cu, Ti, La, Sr, Mn, through excessive
Amount experimental studies have found that, collosol and gel prepare CCTO and LSMO required solvent, pH value, later stage sintering etc. on experiment condition all
There is larger gap, therefore a step preparation can not be carried out using sol-gal process.
The content of the invention
The invention provides the side that a kind of sol-gel process prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material
Method, prepared compound magnetoelectric ceramic material are the LSMO-CCTO composite ceramics materials for having simultaneously high dielectric property and magnetic characteristic
Material.
The present invention adopts the following technical scheme that realization：It is compound that a kind of sol-gel process prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O
The method of magnetoelectric ceramic material, prepared respectively with sol-gel process strontium lanthanum manganese oxide i.e. LSMO precursor powders, CaCu 3 Ti 4 O and
CCTO precursor powders, LSMO and CCTO precursor powder are using mass ratio as 2:8-3:Adhesive is added after 7 ratio mixing,
Ceramic body is pressed into after well mixed, it is the compound magnetic of LSMO-CCTO that ceramic body, which is sintered, and obtains strontium lanthanum manganese oxide/CaCu 3 Ti 4 O
Electroceramics sample.
Comprise the following steps that：
（1）Strontium lanthanum manganese oxide is the preparation of LSMO precursor powders：A, it is 2 according to the mol ratio of lanthanum, strontium, manganese, citric acid:1:3:
7.2 ratio weighs lanthanum nitrate, strontium nitrate, measures manganese nitrate solution and citric acid, is solvent by lanthanum nitrate, nitre using deionized water
Sour strontium and citric acid fully dissolve, and form A1 solution, and manganese nitrate solution is water-soluble with isometric deionized water dissolving formation manganese nitrate
Liquid, because manganese nitrate solution concentration is larger, it is unfavorable for the progress of subsequent reactions, therefore is diluted；B, side stirring A1 solution
While manganese nitrate aqueous solution is added in A1 solution, it is 7 to adjust pH value with the ammoniacal liquor that mass fraction is 25 ~ 28%, and it is molten to form B1
Liquid；C, 2g polyethylene glycol is added into B1 solution, is stirred to being completely dissolved, stirring in 80 DEG C of water-baths is subsequently placed in and is formed and coagulated
Glue；D, the gel formed is placed in evaporating dish, and drying 0.5h with 500 DEG C of electric furnaces obtains black powder, and then grinding is uniform, is placed in
In Muffle furnace, 2h is incubated at 650 DEG C, organic matter is excluded, obtains LSMO precursor powder；
（2）The preparation of CaCu 3 Ti 4 O and CCTO precursor powders：A, it is 1 according to calcium, copper, titanium, citric acid mol ratio:3:4:9.6
Ratio weigh calcium nitrate, copper nitrate, butyl titanate and citric acid, be solvent by calcium nitrate, copper nitrate and lemon using absolute ethyl alcohol
The fully dissolving of lemon acid, the nitre acid for adjusting pH value for being then 65% with mass fraction is 2 ~ 3, forms A2 solution；Added in butyl titanate
Isometric absolute ethyl alcohol is diluted to B2 solution；B, B2 solution is added in A2 solution when stirring A2 solution and forms colloidal sol；
C, 2g polyethylene glycol is added in the colloidal sol formed, stirred to being completely dissolved, it is dry solidifying to be placed in stirring formation blueness in 80 DEG C of water-baths
Glue；D, the gel formed is placed in evaporating dish, and drying 0.5h with 500 DEG C of electric furnaces obtains grey powder, and then grinding is uniform, is placed in horse
Not in stove, 2 h are incubated at 650 DEG C, organic matter is excluded, obtains CCTO precursor powder；
（3）The preparation of LSMO-CCTO compound magnetoelectric ceramic materials：1）Step is weighed respectively according to mass ratio（1）The LSMO of preparation
Precursor powder and step（2）The CCTO precursor powders of preparation are fully ground mixing, add 4ml adhesives and continue ground and mixed
LSMO-CCTO precursor powders are formed uniformly, disk is made under 200 MPa pressure, then proceedes to grind, cross the mesh of 80 mesh -120
Sieve, ceramic body is pressed into after dumping；2）The LSMO-CCTO base substrates of preparation, which are placed in sintering furnace, to be sintered, sintering temperature 900
DEG C, heating rate is 300 DEG C/h, is incubated 8 hours, then according to 10 DEG C/min Programmed freezings, obtains LSMO-CCTO composite ceramics
Ceramic material.
Step（1）And step（2）Stir speed (S.S.) is 200 rpm in middle water-bath.Step（3）The LSMO-CCTO of middle screening
Base substrate is made under 350 MPa pressure in powder；Dump temperature is 650 DEG C, and dumping soaking time is 30 minutes.Step（3）Middle institute
It is polyvinyl alcohol or glycerine to state adhesive.Step（3）Described in wafer thickness be 5 mm, a diameter of 25 mm.Manufactured ceramic blank
Body thickness about 1 mm, the mm of diameter 12.
By the LSMO-CCTO composite ceramicses sample surfaces prepared polishing, polishing, by silver, make electrode, characterized and
Magnetic, electric performance test.Step（10）The B solution is the butyl titanate diluted by absolute ethyl alcohol, can reduce and be mixed with solution A
When the possibility that hydrolyzes.
For preparation for LSMO-CCTO composite ceramics samples, select suitable moulding process extremely important, controlling agent
It is similarly crucial to measure ratio.The present invention prepares LSMO and CCTO precursor powder using sol-gel process respectively, by solution
The control of the pilot process such as pH value, gelling temperature, mixing speed, pre-burning condition, body preparation pressure, finally realizes consistency
Height, uniformity are good, while have the LSMO-CCTO composite ceramics samples of high dielectric property and excellent magnetic characteristic.
Further, prepared precursor powder crosses the mesh sieve of 80 mesh -120, and base substrate is made under 350 MPa pressure.Base substrate
The powder size and pressure used in preparation process ensure that final product has higher dielectric constant, while the cause of product
Density and uniformity are also effectively improved.
The present invention prepares LSMO and CCTO precursor powder respectively using sol-gal process, then solid phase powder is carried out
Weigh, be sufficiently mixed and then select suitable condition and suppressed, sintered, finally prepare CCTO-LSMO composite ceramic materials.
The present invention the advantages of using above-mentioned technical proposal is：The valency of the raw material such as calcium nitrate, copper nitrate, lanthanum nitrate, strontium nitrate, manganese nitrate
Lattice are cheap, and cost of material is low；Sol gel reaction process component is controllable, prevents dephasign；About 4-8 hour of gelation time,
Reduce time cost；Preparation technology is simple, and ceramics sample better crystallinity degree, the uniformity obtained is high；The dielectric of ceramics sample is special
Property and magnetic all embody very strong regularity.Gelation time is short, and potsherd consistency is high, crystal grain good evenness.The present invention is logical
LSMO and CCTO mass fraction ratio is overregulated, changes the microstructure of composite, and then improve composite magnetic, electricity
The purpose of performance.Method therefor technique is simple, is easy to industrialized production, the ceramics sample consistency height of preparation, particle uniformity
Good, magnetic electricity performance is excellent.
Brief description of the drawings
Fig. 1 is the X-ray diffractogram of LSMO-CCTO ceramics samples in embodiment 1.Fig. 2 is LSMO-CCTO in embodiment 1
The dielectric and magnetic figure of ceramics sample（ε '-f curves）.Fig. 3 is LSMO-CCTO ceramics samples hysteresis curve figure in embodiment 1.
Embodiment
With reference to the accompanying drawings and examples, the present invention will be further described, but is in no way intended to limit the scope of the present invention.
Embodiment 1：A kind of method that sol-gel process prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material, use
Sol-gel process prepares strontium lanthanum manganese oxide i.e. LSMO precursor powders, CaCu 3 Ti 4 O and CCTO precursor powders respectively, LSMO and
Adhesive is added after CCTO precursor powder mixing, ceramic body is pressed into after well mixed, ceramic body is sintered and obtained
Strontium lanthanum manganese oxide/CaCu 3 Ti 4 O is LSMO-CCTO compound magnetoelectric ceramics samples.
Comprise the following steps that：
（1）Strontium lanthanum manganese oxide is the preparation of LSMO precursor powders：A, weigh 29.16 g lanthanum nitrates, 7.13 g strontium nitrates and
50.68g citric acids, using deionized water as solvent, three kinds of raw materials are completely dissolved, obtain white clear mixed solution A 1；
35.79 g manganese nitrate solutions are measured, and add the deionized water of equivalent, stirs to being thoroughly mixed, obtains pale pink manganese nitrate water
Solution, because manganese nitrate solution concentration is larger, it is unfavorable for the progress of subsequent reactions, therefore is diluted；B, solution A 1 is put
In magnetic stirring apparatus, state is kept stirring for, then manganese nitrate aqueous solution is slowly added in A1 solution, until forming transparent mixing
Solution, ammoniacal liquor regulation pH value is 7；C, 2.0 g polyethylene glycol are added to stir to being completely dissolved, promotes plastic, is subsequently placed in 80 DEG C
200rpm is stirred in water-bath, until forming pale pink xerogel；D, obtained xerogel is placed in evaporating dish, adjusts electric furnace
Temperature is 500 DEG C, and the preliminary exclusion of organic matter is carried out in ventilating kitchen, obtains black powder, and then grinding is uniform, is placed in Muffle
In stove, 2h is incubated at 650 DEG C, organic matter is further excluded, finally can obtain black LSMO precursor powders；
（2）The preparation of CaCu 3 Ti 4 O and CCTO precursor powders：A, weigh 7.16 g calcium nitrate, 21.96 g copper nitrates and
60.82 g citric acids, using absolute ethyl alcohol as solvent, three kinds of raw materials are completely dissolved, are 2-3 with nitre acid for adjusting pH value, most
Blue-tinted transparent mixed solution A 2 is obtained eventually；41.25 g butyl titanates are measured, and add isometric absolute ethyl alcohol, are stirred to complete
Full mixing, obtains faint yellow mixed solution B2；B, solution A 2 is placed in magnetic stirring apparatus, is kept stirring for state, then B2 is molten
Liquid is slowly added in A2 solution（Prevent butyl titanate from hydrolyzing）, until forming transparent mixed solution, then add the poly- second two of 2.0 g
Alcohol is stirred to being completely dissolved promotion plastic；It is placed in stir speed (S.S.) in 80 DEG C of water-baths to stir for 200 rpm, until it is dry to form blueness
Gel；C, obtained blue xerogel is placed in evaporating dish, regulation furnace temperature is 500 DEG C, is carried out in ventilating kitchen organic
The preliminary exclusion of thing, obtains grey powder, and then grinding is uniform, is placed in Muffle furnace, 2 h are incubated at 650 DEG C, organic matter is entered
One step excludes, and finally can obtain grey CCTO precursor powders；
（3）The preparation of LSMO-CCTO compound magnetoelectric ceramic materials：1）By step（1）The LSMO precursor powders and step of preparation
（2）The CCTO precursor powders of preparation weigh 3 g according to mass ratio respectively and 7 g are fully ground mixing in mortar, obtain
LSMOx-CCTO1-xThe Precursor Powder of the mixing of (x=0.3)；2）Polyvinyl alcohol, glycerine are added as adhesive, it is mixed to continue grinding
Conjunction is uniformly fully ground, and the mm of thickness about 5 is made under 200 MPa pressure, the mm of diameter 25 disk, is subsequently placed in mortar and grinds
It is broken, cross the mesh sieve of 80 mesh -120, the powder of screening carries out the making of ceramic body, and pressure is 350 MPa, the mm of base substrate thickness about 1,
The mm of diameter 12；The base substrate made is placed in into sintering furnace to be sintered, sintering temperature be 900 DEG C, heating rate be 300 DEG C/
H, the h of soaking time 8, carry out Programmed freezing, the final composite ceramics sample for obtaining LSMO-CCTO, figure according to 10 DEG C/min afterwards
1 shows that LSMO and CCTO two-phases coexist in the composite, and the chemistry of ferromagnetic phase and ferroelectric phase does not occur in sintering process
Reaction.By Fig. 1 it will be seen that with the increase of LSMO mass ratioes, LSMO and CCTO peak intensity are than basic linear increasing
Add, and the impurity peaks beyond LSMO and CCTO do not occur, illustrate the mass ratio for changing LSMO and CCTO, the LSMO of ferromagnetic phase
It still can be very good to coexist with the CCTO of dielectric phase.But the microstructure of the dielectric of composite ceramics and magnetic with material has
Substantial connection, different quality will be entirely different than the microstructure of synthesized composite ceramics, and therefore, different quality is than synthesis
Composite ceramics magnetic electricity performance expection will great changes have taken place.
By the ceramics sample surface prepared polishing, polishing, by silver, making electrode, progress electrical property and magnetism testing.
Fig. 2 shows that sample dielectric constant under 10 Hz is up to 5.06 × 103.Can test scope（10 Hz-2 MHz）It is interior with frequency
Increase dielectric constant have a declining tendency and directric relaxation occur.Fig. 3 shows that the sample when externally-applied magnetic field is 10 kOe
When, magnetic moment is also not up to saturation, there is relatively high saturation magnetic moment（1.16 emu/g, it is about 578.5 emu/ after conversion
mol）, show good magnetic property.Under 400 Oe, magnetic moment is close to 200 emu/mol.
Dielectric property figure can be found, under low frequency（20 Hz）, the sample of x=0.3（Dielectric constant ＞ 5000）Dielectric constant
The almost sample of x=0.05（Dielectric constant about 60）100 times, under high frequency（2 MHz）The sample of x=0.3（Dielectric constant is about
100）Dielectric constant be still x=0.05（Dielectric constant is about 8）More than 10 times.
LSMO-CCTO composites prepared by the present invention can embody excellent high dielectric property, embody simultaneously
Good magnetic characteristic, it is the magnetic electric compound material with very big application prospect.
In order to study influence of the mass ratio between LSMO and CCTO to dielectric properties and magnetic property, following three are have also been devised
Individual embodiment.
Embodiment 2：The present embodiment and the difference of embodiment 1 be, the mass ratio between LSMO and CCTO it is different (x=
0.2) 2 g and 8 g, are weighed respectively, are tested and are found by dielectric properties, compared to embodiment 1, the dielectric constant of sample reduces, and
And the amplitude declined is bigger.Found by magnetism testing, compared to embodiment 1, the magnetic of sample also significantly declines, and declines
To 0.28 emu/g.
Embodiment 3：The present embodiment and the difference of embodiment 1 be, the mass ratio between LSMO and CCTO it is different (x=
0.1) 1 g and 9 g, are weighed respectively, tests and finds by dielectric properties, and compared to Examples 1 and 2, the dielectric constant of sample continues
Reduce.Found by magnetism testing, compared to Examples 1 and 2, sample does not almost show the feature of magnetic.
Embodiment 4：The present embodiment and the difference of embodiment 1 be, the mass ratio between LSMO and CCTO it is different (x=
0.05) 0.5 g and 9.5 g, are weighed respectively, are tested and are found by dielectric properties, compared to embodiment 1,2 and 3, the dielectric of sample
Constant is minimum.Found by magnetism testing, compared to Examples 1 and 2, sample is also the feature for almost not showing magnetic.
The dielectric constant and saturation magnetic moment of the embodiment of table 1.
Claims (7)
1. a kind of method that sol-gel process prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material, it is characterised in that：
Prepare strontium lanthanum manganese oxide i.e. LSMO precursor powders, CaCu 3 Ti 4 O and CCTO precursor powders respectively with sol-gel process, LSMO and
CCTO precursor powder is using mass ratio as 2:8-3:Adhesive is added after 7 ratio mixing, ceramics are pressed into after well mixed
Base substrate, it is LSMO-CCTO compound magnetoelectric ceramics samples that ceramic body, which is sintered, and obtains strontium lanthanum manganese oxide/CaCu 3 Ti 4 O.
2. a kind of sol-gel process according to claim 1 prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material
Method, it is characterised in that：Comprise the following steps that：
（1）Strontium lanthanum manganese oxide is the preparation of LSMO precursor powders：A, it is 2 according to the mol ratio of lanthanum, strontium, manganese, citric acid:1:3:
7.2 ratio weighs lanthanum nitrate, strontium nitrate, measures manganese nitrate solution and citric acid, is solvent by lanthanum nitrate, nitre using deionized water
Sour strontium and citric acid fully dissolve, and form A1 solution, and manganese nitrate solution is water-soluble with isometric deionized water dissolving formation manganese nitrate
Liquid；B, manganese nitrate aqueous solution is added in A1 solution when stirring A1 solution, adjusted with the ammoniacal liquor that mass fraction is 25 ~ 28%
PH value is 7, forms B1 solution；C, 2g polyethylene glycol is added into B1 solution, stirs to being completely dissolved, is subsequently placed in 80 DEG C of water-baths
Stirring forms gel in pot；D, the gel formed is placed in evaporating dish, and drying 0.5h with 500 DEG C of electric furnaces obtains black powder, so
Grinding is uniform afterwards, is placed in Muffle furnace, and 2h is incubated at 650 DEG C, excludes organic matter, obtains LSMO precursor powder；
（2）The preparation of CaCu 3 Ti 4 O and CCTO precursor powders：A, it is 1 according to calcium, copper, titanium, citric acid mol ratio:3:4:9.6
Ratio weigh calcium nitrate, copper nitrate, butyl titanate and citric acid, be solvent by calcium nitrate, copper nitrate and lemon using absolute ethyl alcohol
The fully dissolving of lemon acid, the nitre acid for adjusting pH value for being then 65% with mass fraction is 2 ~ 3, forms A2 solution；Added in butyl titanate
Isometric absolute ethyl alcohol is diluted to B2 solution；B, B2 solution is added in A2 solution when stirring A2 solution and forms colloidal sol；
C, 2g polyethylene glycol is added in the colloidal sol formed, stirred to being completely dissolved, it is dry solidifying to be placed in stirring formation blueness in 80 DEG C of water-baths
Glue；D, the gel formed is placed in evaporating dish, and drying 0.5h with 500 DEG C of electric furnaces obtains grey powder, and then grinding is uniform, is placed in horse
Not in stove, 2 h are incubated at 650 DEG C, organic matter is excluded, obtains CCTO precursor powder；
（3）The preparation of LSMO-CCTO compound magnetoelectric ceramic materials：1）Step is weighed respectively according to mass ratio（1）The LSMO of preparation
Precursor powder and step（2）The CCTO precursor powders of preparation are fully ground mixing, add 4ml adhesives and continue ground and mixed
LSMO-CCTO precursor powders are formed uniformly, disk is made under 200 MPa pressure, then proceedes to grind, cross the mesh of 80 mesh -120
Sieve, ceramic body is pressed into after dumping；2）The LSMO-CCTO base substrates of preparation, which are placed in sintering furnace, to be sintered, sintering temperature 900
DEG C, heating rate is 300 DEG C/h, is incubated 8 hours, then according to 10 DEG C/min Programmed freezings, obtains LSMO-CCTO composite ceramics
Ceramic material.
3. a kind of sol-gel process according to claim 2 prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material
Method, it is characterised in that：Step（1）And step（2）Stir speed (S.S.) is 200 rpm in middle water-bath.
4. a kind of sol-gel process according to claim 2 prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material
Method, it is characterised in that：Step（3）Base substrate is made under 350 MPa pressure in the LSMO-CCTO powder of middle screening；Dumping temperature
Spend for 650 DEG C, dumping soaking time is 30 minutes.
5. a kind of sol-gel process according to claim 2 prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material
Method, it is characterised in that：Step（3）Described in adhesive be polyvinyl alcohol or glycerine.
6. a kind of sol-gel process according to claim 2 prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material
Method, it is characterised in that：Step（3）Described in wafer thickness be 5 mm, a diameter of 25 mm.
7. a kind of sol-gel process according to claim 4 prepares strontium lanthanum manganese oxide/CaCu 3 Ti 4 O compound magnetoelectric ceramic material
Method, it is characterised in that：The manufactured mm of ceramic body thickness about 1, the mm of diameter 12.
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| CN115522157A (en) * | 2022-10-28 | 2022-12-27 | 中国人民解放军火箭军工程大学 | Preparation method of LSMO/AT13 high-temperature wave-absorbing coating based on thermal spraying |
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