CN106518058A - Lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof - Google Patents
Lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 150000001875 compounds Chemical class 0.000 title claims abstract description 13
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title abstract description 83
- 239000011787 zinc oxide Substances 0.000 title abstract description 43
- YPQJHZKJHIBJAP-UHFFFAOYSA-N [K].[Bi] Chemical compound [K].[Bi] YPQJHZKJHIBJAP-UHFFFAOYSA-N 0.000 title abstract description 4
- 229910002115 bismuth titanate Inorganic materials 0.000 title abstract 2
- 239000012071 phase Substances 0.000 claims abstract description 37
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 4
- 238000010532 solid phase synthesis reaction Methods 0.000 claims abstract description 3
- 229910010252 TiO3 Inorganic materials 0.000 claims description 88
- 239000000843 powder Substances 0.000 claims description 21
- 238000000498 ball milling Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 238000001354 calcination Methods 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011858 nanopowder Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 229910000238 buergerite Inorganic materials 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 4
- 230000028161 membrane depolarization Effects 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000002441 X-ray diffraction Methods 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 235000015320 potassium carbonate Nutrition 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910003237 Na0.5Bi0.5TiO3 Inorganic materials 0.000 description 2
- 229910003080 TiO4 Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- 229910002659 PbMg1/3Nb2/3O3 Inorganic materials 0.000 description 1
- 229910003781 PbTiO3 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- JTCFNJXQEFODHE-UHFFFAOYSA-N [Ca].[Ti] Chemical compound [Ca].[Ti] JTCFNJXQEFODHE-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- VKJLWXGJGDEGSO-UHFFFAOYSA-N barium(2+);oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[O-2].[Ti+4].[Ba+2] VKJLWXGJGDEGSO-UHFFFAOYSA-N 0.000 description 1
- FSAJRXGMUISOIW-UHFFFAOYSA-N bismuth sodium Chemical compound [Na].[Bi] FSAJRXGMUISOIW-UHFFFAOYSA-N 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 230000005621 ferroelectricity Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000001757 thermogravimetry curve Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000026683 transduction Effects 0.000 description 1
- 238000010361 transduction Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
- C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
- C04B35/475—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on bismuth titanates
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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Abstract
The invention relates to a lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof, and belongs to the technical field of ferroelectric ceramics. The invention aims at inhibiting the depolarization phenomenon of K0.5Bi0.5TiO3 and promoting the ferroelectric property. K2CO3, TiO2, Bi2O3 and ZnO are taken as raw materials and are compounded to prepare the lead-free compound ferroelectric ceramic K0.5Bi0.5TiO3:ZnO by a two-step solid phase method. Through X-ray diffraction, scanning electron microscope and a dielectric test, the microcosmic structure and dielectric behavior of the compound ceramic are analyzed. The results show that three-phase Zn2TiO4 is generated in the compound ceramic after ZnO is added into K0.5Bi0.5TiO3, the introduction of ZnO can inhibit the phase transformation of K0.5Bi0.5TiO3 from normal ferroelectrics to relaxation ferroelectrics, and the introduction of ZnO has significance in applying and researching K0.5Bi0.5TiO3.
Description
Technical field
The present invention relates to a kind of new K0.5Bi0.5TiO3:The unleaded compound ferroelectric ceramics of ZnO, is by Ca-Ti ore type
K0.5Bi0.5TiO3It is composited with Nano semiconductor ZnO, avoids being changed into relaxor ferroelectric by normal frroelectrics before curie point
Body, the temperature stability with high ferroelectric properties belong to ferroelectric ceramics technical field.
Technical background
Piezoelectric ceramics be one kind to electricity, power, heat, light activated material, be the product that artificial polarization is carried out to ferroelectric ceramics,
It is widely applied in fields such as ultrasonic transduction, sensor, Non-Destructive Testing and communications.Ferroelectric ceramics general at present is with Pb
(Zr,Ti)O3(PZT) ceramic main, wherein lead content are general all more than 70%, volatile at high temperature and when using, in system
It is standby, use and discard in last handling process and all can bring infringement to environment and the mankind.The developed countries such as the U.S., Japan and European Union are
Jing limits the manufacture and use of leaded ceramics by legislative pattern.It is mesh that searching can substitute the lead-free piezoceramic material of PZT
One of urgent problem of front field of electronic materials.
Lead-free ferroelectric ceramics refer to that existing good environment harmony has the class new function ceramics of preferable usability again
Material.The main leadless piezoelectric ceramics system of research has Barium metatitanate. (BaTiO at present3, BT) based leadless piezoelectric ceramics, bismuth-sodium titanate
(Na0.5Bi0.5TiO3, NBT) based leadless piezoelectric ceramics, bismuth potassium titanate (K0.5Bi0.5TiO3, KBT) and based leadless piezoelectric ceramics and niobic acid
Potassium sodium (Na0.5K0.5NbO3, KNN) based leadless piezoelectric ceramics etc..Wherein, perovskite structure K0.5Bi0.5TiO3(referred to as KBT) is
Year nineteen sixties, by a kind of A positions complex perovskite structure ferroelectric of the discoveries such as Smolenskii, belongs to four during room temperature
Square ferroelectric phase, Curie temperature higher (410 DEG C), and sintering temperature it is low (<1100 DEG C), and study more at present
Na0.5Bi0.5TiO3(referred to as BNT) structure is quite similar.Compared with BNT, KBT has higher Curie temperature and relatively low rectifys
Stupid field EC=1.5kV/mm, therefore, there is KBT broader temperature to use interval and relatively low polarization difficulty, become a kind of outstanding
Lead-free ferroelectric material.By the multivariate solid solution system being compounded to form with it, can further improve the sintering and electricity of KBT ceramics
Performance.But, at high temperature, KBT is a cube paraelectric phase, when cooling to 380 DEG C, system turning generation cube-Tetragonal
Become.At T=300 DEG C, there is the second phase in version, and have the presence of thermal hysteresis near 270 DEG C.This transformation and NBT
Phase in version be equally people's bone of contention, also limit the range of application and temperature stability of KBT matrixes system.
In dielectric and piezoelectric ceramics, ZnO is widely used as a kind of sintering aid, and its addition promotes liquid phase
Formed, cause the substantial amounts of ion migration in sintering process, so as to improve the compactness of ceramics, promoted crystal grain and grow up.Grind
Study carefully and show, Zn2+The B positions in perovskite structure can be substituted, so as to change the temperature of phase in version, the electricity of ferroelectric ceramics is improved
Performance.Zn2+Replacement improve ternary solid solution PbMg1/3Nb2/3O3 PbZn1/3Nb2/3O3 PbTiO3The calcium titanium of system
The stability of mineral phase structure.
Among ZnO is introduced KBT, a kind of composite is formed.Using the characteristic of semiconductor of ZnO, it is built-in that ZnO is formed
Electric field inhibits the degradation phenomena of KBT, improves the stability of phase structure.Which solve KBT one before application on scape heavy
Big problem, is that the application development of KBT establishes solid foundation.
The content of the invention
The purpose of the present invention is by K0.5Bi0.5TiO3It is compound with quasiconductor ZnO, suppress K0.5Bi0.5TiO3By normal
Ferroelectric is changed into the phase in version of relaxation ferroelectric, improves K0.5Bi0.5TiO3The stable type of phase structure.
To reach goal of the invention, the present invention enters K by introducing nano-ZnO0.5Bi0.5TiO3In, to be formed
K0.5Bi0.5TiO3:ZnO composite ceramicses, to getting a desired effect, wherein the molar content of ZnO is 20%～30%.
One kind is by K0.5Bi0.5TiO3The unleaded compound ferroelectric ceramics constituted with ZnO, it is characterised in that by perovskite structure
K0.5Bi0.5TiO3With the crystal structure of nano level ZnO semiconductors couplings, formula is (1-x) K0.5Bi0.5TiO3:
XZnO, 0.20≤x≤0.30.
K0.5Bi0.5TiO3It is with cubic perovskite crystalline phase K0.5Bi0.5TiO3, ZnO is buergerite phase ZnO.
The present invention by K0.5Bi0.5TiO3The preparation method of the unleaded compound ferroelectric ceramics constituted with ZnO, its feature exist
In using the preparation technology of two step solid phase methods, the first step is the stable K of preparation structure0.5Bi0.5TiO3Ceramic powder, second step
To introduce ZnO, with K0.5Bi0.5TiO3Form composite ceramicses.
K0.5Bi0.5TiO3The preparation process of ceramic powder is as follows：According to K0.5Bi0.5TiO3Element metering than weigh raw material
K2CO3, Bi2O3, TiO2, the ball milling at least 12h in dehydrated alcohol so that raw material is sufficiently mixed uniformly, after drying, 800 DEG C～
2～5h is calcined at 850 DEG C, ball milling 12h makes powder body levigate again, dries, and obtains pure perovskite phase structure K0.5Bi0.5TiO3Powder
Body.To improve K0.5Bi0.5TiO3Phase stability, will the K that obtains of calcining0.5Bi0.5TiO3Powder body is in 980 DEG C～1020 DEG C pre-burnings
2～4h of knot, Jing ball millings at least 12h, drying, for K0.5Bi0.5TiO3:The preparation of ZnO composite ceramicses.
K0.5Bi0.5TiO3：The preparation process of ZnO composite ceramicses is as follows：By formula (1-x) K0.5Bi0.5TiO3:xZnO(0.20
The mol ratio of≤x≤0.30), weighs the K that presintering is obtained0.5Bi0.5TiO3Powder body and ZnO nano powder body, ball milling at least 12h,
Drying, mix adhesive PVB, it is compressing, base substrate after 650 DEG C of dumpings, with the ramp of 3 DEG C/min to 1000 DEG C～
1050 DEG C are sintered, and are incubated 1～3h, obtain K0.5Bi0.5TiO3:ZnO complex phase ceramics.It is preferred that being sintered at 1020 DEG C,
Insulation 1.5 hours.
Potsherd after sintering by upper silver electrode, for the test of properties is carried out to sample.
Further：Show：K0.5Bi0.5TiO3After the middle ZnO for introducing 20% (mole percent), generate in composite ceramicses
Third phase Zn2TiO4, particularly, the introducing of ZnO inhibits K0.5Bi0.5TiO3Turn from normal frroelectrics to the phase of relaxation ferroelectric
Become, to K0.5Bi0.5TiO3Application and research play the role of it is important.
The present invention is by building K0.5Bi0.5TiO3With the 0-3 type structures of ZnO, it is successfully realized to K0.5Bi0.5TiO3Base without
The improvement of galvanized iron electroceramics properties, it is suppressed that K0.5Bi0.5TiO3From normal frroelectrics to the phase in version of relaxation ferroelectric.
Description of the drawings
Using the phase structure of German Bruker companies D8-Advance types X-ray diffractometer determination sample, Hitachi S
4800 scanning electron microscopes determine the microstructure of prepared material.Using ferroelectricity tester (Premier II, Radiant
Technologies, USA), test ferroelectric properties.Using be furnished with temperature heating unit accurate LCR tables (E4980, Agilent,
USA) the dielectric property of test sample.
Fig. 1 calcines 4h, 1000 DEG C of presintering 3h, (1- of 1020 DEG C of sintering 1.5h at 800 DEG C for the embodiment of the present invention 5
x)K0.5Bi0.5TiO3:The scanning electron microscope (SEM) photograph of xZnO (x=0 and 0.2)
Fig. 2 calcines 4h, 1000 DEG C of presintering 3h at 800 DEG C for the embodiment of the present invention 5, sinters 1.5h's at 1020 DEG C
(1-x)K0.5Bi0.5TiO3:The XRD spectrum of xZnO (x=0 and 0.2).
Fig. 3 calcines 4h, 1000 DEG C of presintering 3h at 800 DEG C for the embodiment of the present invention 5, sinters 1.5h's at 1020 DEG C
(1-x)K0.5Bi0.5TiO3:The dielectric thermogram of xZnO (x=0 and 0.2).
Specific embodiment
With reference to embodiment, the present invention will be further described, but the present invention is not limited to following examples.
Embodiment 1
Formula：0.8K0.5Bi0.5TiO3:0.2ZnO
K0.5Bi0.5TiO3The preparation of powder body is analyzing pure K2CO3(99.99%), Na2CO3And Bi (99.99%)2O3
(99.99%) it is raw material, according to K0.5Bi0.5TiO3Element metering than weigh raw material, in dehydrated alcohol ball milling 12h, drying
Afterwards, 2h is calcined at 800 DEG C, ball milling 12h, drying, obtain pure perovskite phase structure K again0.5Bi0.5TiO3Powder body.To improve
K0.5Bi0.5TiO3Phase stability, will the K that obtains of calcining0.5Bi0.5TiO3Powder body is in 980 DEG C of presintering 2h, Jing ball milling 12h, baking
It is dry, for K0.5Bi0.5TiO3：The preparation of ZnO complex phase ceramics.
0.8K0.5Bi0.5TiO3：The preparation of 0.2ZnO complex phase ceramic samples weighs what presintering was obtained in molar ratio
K0.5Bi0.5TiO3Powder body and ZnO nano powder body (particle diameter about 30nm), ball milling 12h, drying mix adhesive PVB, in 400MPa
Pressure under be pressed into the disk of a diameter of 11.5mm.Base substrate after 650 DEG C of dumpings, with the ramp of 3 DEG C/min to 1000
DEG C it is sintered, is incubated 1h, obtains 0.8K0.5Bi0.5TiO3:0.2ZnO complex phase ceramics.
Embodiment 2
Formula：0.75K0.5Bi0.5TiO3:0.25ZnO
K0.5Bi0.5TiO3Powder calcination temperature is 840 DEG C, is incubated 4h, and calcined temperature is 1010 DEG C, is incubated 3h,
K0.5Bi0.5TiO3:The sintering temperature of ZnO complex phase ceramics is 1030 DEG C, is incubated 2h.The other the same as in Example 1.
Embodiment 3
Formula：0.75K0.5Bi0.5TiO3:0.25ZnO
K0.5Bi0.5TiO3Powder calcination temperature is 820 DEG C, is incubated 3h, and calcined temperature is 1000 DEG C, is incubated 2.5h,
K0.5Bi0.5TiO3:The sintering temperature of ZnO complex phase ceramics is 1020 DEG C, is incubated 2.5h.The other the same as in Example 1.
Embodiment 4
Formula：0.7K0.5Bi0.5TiO3:0.3ZnO
K0.5Bi0.5TiO3Powder calcination temperature is 850 DEG C, is incubated 5h, and calcined temperature is 1020 DEG C, is incubated 4h,
K0.5Bi0.5TiO3:The sintering temperature of ZnO complex phase ceramics is 1050 DEG C, is incubated 3h.The other the same as in Example 1.
Embodiment 5
Formula：0.8K0.5Bi0.5TiO3:0.2ZnO
K0.5Bi0.5TiO3Powder calcination temperature is 800 DEG C, is incubated 4h, and calcined temperature is 1000 DEG C, is incubated 3h,
K0.5Bi0.5TiO3:The sintering temperature of ZnO complex phase ceramics is 1020 DEG C, is incubated 1.5h.The other the same as in Example 1.
The ceramics sample for preparing as shown in Figure 1 is presented the microstructure of densification, and defect is less.Also, ZnO's draws
Enter to promote K0.5Bi0.5TiO3Granule increase.ZnO has sintering aids role, can be in K0.5Bi0.5TiO3Ceramics are internally formed liquid phase, lead
Its crystal grain is caused to grow up.
The K for preparing as shown in Figure 20.5Bi0.5TiO3It is cubic perovskite structure (JCPDS36-0339) under powder body room temperature, plus
After entering ZnO, K0.5Bi0.5TiO3It is still tetragonal phase structure, but its tetragonality is obviously reduced.Observe 2 θ be (211) at 56 °/
(112), after diffraction maximum is it is found that add ZnO, its splitting degree is substantially reduced.Simultaneously it can also be observed that third phase Zn2TiO4
Phase (JCPDS 73-0578).
Pure K as shown in Figure 30.5Bi0.5TiO3Kind, except temperature T=380 DEG C, nearby there is maximum in real part of permittivity
Outward, K0.5Bi0.5TiO3The imaginary part of dielectric constant of sample has a peak at 270 DEG C or so, shows near this temperature
K0.5Bi0.5TiO3It is changed into relaxation ferroelectric, referred to as K by normal frroelectrics0.5Bi0.5TiO3Degenerate temperature.Add 20%
After nano-ZnO, abnormal phenomena, explanation is not observed near 270 DEG C in the spectrogram of dielectric real part and imaginary part
K0.5Bi0.5TiO3Do not occur depolarization phenomenon in temperature ramp de, illustrate that the addition of ZnO inhibits K0.5Bi0.5TiO3's
Degradation phenomena.
Claims (5)
1. one kind is by K0.5Bi0.5TiO3The unleaded compound ferroelectric ceramics constituted with ZnO, it is characterised in that by perovskite structure
K0.5Bi0.5TiO3With the crystal structure of nano level ZnO semiconductors couplings, formula is (1-x) K0.5Bi0.5TiO3:XZnO,
0.20≤x≤0.30。
2. according to the one kind described in claim 1 by K0.5Bi0.5TiO3The unleaded compound ferroelectric ceramics constituted with ZnO, its feature exist
In K0.5Bi0.5TiO3It is with cubic perovskite crystalline phase K0.5Bi0.5TiO3, ZnO is buergerite phase ZnO.
3. described in claim 1 or 2 by K0.5Bi0.5TiO3The unleaded compound ferroelectric ceramics constituted with ZnO obtains preparation method, its
It is characterised by, using the preparation technology of two step solid phase methods, the first step is the stable K of preparation structure0.5Bi0.5TiO3Ceramic powder,
Second step is introducing ZnO, with K0.5Bi0.5TiO3Form composite ceramicses.
4. according to the method for claim 3, it is characterised in that K0.5Bi0.5TiO3The preparation process of ceramic powder is as follows：According to
K0.5Bi0.5TiO3Element metering than weigh raw material K2CO3、Bi2O3、TiO2, in dehydrated alcohol, ball milling at least 12h is so that raw material
It is sufficiently mixed uniformly, after drying, 2～5h is calcined at 800 DEG C～850 DEG C, ball milling at least 12h makes powder body levigate again, dries,
Obtain pure perovskite phase structure K0.5Bi0.5TiO3Powder body；To improve K0.5Bi0.5TiO3Phase stability, calcining is obtained
K0.5Bi0.5TiO3Powder body is in 980 DEG C～1020 DEG C 2～4h of presintering, Jing ball millings at least 12h, drying, for K0.5Bi0.5TiO3:
The preparation of ZnO composite ceramicses；
K0.5Bi0.5TiO3：The preparation process of ZnO composite ceramicses is as follows：By formula (1-x) K0.5Bi0.5TiO3:The mol ratio of xZnO,
Weigh the K that presintering is obtained0.5Bi0.5TiO3Powder body and ZnO nano powder body, ball milling at least 12h, drying mix adhesive PVB,
Compressing, base substrate is sintered to 1000 DEG C～1050 DEG C with the ramp of 3 DEG C/min after 650 DEG C of dumpings, insulation 1
～3h, obtains K0.5Bi0.5TiO3:ZnO complex phase ceramics.
5. according to the method for claim 4, it is characterised in that K0.5Bi0.5TiO3：In the preparation process of ZnO composite ceramicses,
1020 DEG C are sintered, and are incubated 1.5 hours.
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| CN113061029A (en) * | 2021-03-26 | 2021-07-02 | 陕西师范大学 | Sodium niobate-based lead-free ferroelectric ceramic material with energy storage and photovoltaic effects and preparation method thereof |
| CN115286380A (en) * | 2022-08-04 | 2022-11-04 | 北京大学深圳研究院 | BNKT-BT-based composite ceramic material with high depolarization temperature and preparation method thereof |
| WO2022233984A1 (en) * | 2021-05-05 | 2022-11-10 | Pi Ceramic Gmbh | Lead-free piezoceramic material composition based on bismuth sodium titanate-barium titanate (bnt-bt) |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061029A (en) * | 2021-03-26 | 2021-07-02 | 陕西师范大学 | Sodium niobate-based lead-free ferroelectric ceramic material with energy storage and photovoltaic effects and preparation method thereof |
| CN113061029B (en) * | 2021-03-26 | 2023-01-17 | 陕西师范大学 | Sodium niobate-based lead-free ferroelectric ceramic material with energy storage and photovoltaic effects and preparation method thereof |
| WO2022233984A1 (en) * | 2021-05-05 | 2022-11-10 | Pi Ceramic Gmbh | Lead-free piezoceramic material composition based on bismuth sodium titanate-barium titanate (bnt-bt) |
| CN115286380A (en) * | 2022-08-04 | 2022-11-04 | 北京大学深圳研究院 | BNKT-BT-based composite ceramic material with high depolarization temperature and preparation method thereof |
| CN115286380B (en) * | 2022-08-04 | 2023-03-03 | 北京大学深圳研究院 | BNKT-BT-based composite ceramic material with high depolarization temperature and preparation method thereof |
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