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1.
刘鹏  张丹 《物理学报》2011,60(1):17701-017701
采用标准电子陶瓷工艺制备了(Pb(1-3x/2)Lax)(Zr0.5Sn0.3Ti0.2)O3(PLZST,0.00≤x≤0.18)反铁电陶瓷,利用X射线衍射、不同频率下弱场介电温谱、强场下的极化强度-电场(P-E)测试研究了材料相结构和电学性能.实验结果发现,随La含量x增大,室温下材料由铁电三方相(关键词: 反铁电陶瓷 介电频率色散 相变弥散 介电弛豫  相似文献   

2.
单丹  朱珺钏  金灿  陈小兵 《物理学报》2009,58(10):7235-7240
采用了传统的固相烧结工艺,制备了不同Zr和Hf掺杂量的SrBi4Ti4-xZrxO15x=000,003, 006,010,020)和SrBi4Ti4-xHfxO15x=000,0005, 0015,0030,0060)的陶瓷 关键词: 4Ti4-xZrxO15')" href="#">SrBi4Ti4-xZrxO15 4Ti4-xHfxO15')" href="#">SrBi4Ti4-xHfxO15 铁电性能 介电性能  相似文献   

3.
慕春红  刘鹏  贺颖  张丹  孟玲  边小兵 《物理学报》2008,57(4):2432-2437
采用固相反应法制备了CaCu3Ti4-xFexO12(0≤x≤0.2)陶瓷,通过X射线衍射、扫描电子显微镜、介电频谱和阻抗谱等手段研究了Fe对CaCu3Ti4O12陶瓷的结构和介电性能的影响.研究发现:CaCu3Ti4-xFex关键词: 巨介电常数 双阻挡层电容模型 界面极化  相似文献   

4.
曹蕾  刘鹏  周剑平  王亚娟  苏丽娜  刘成 《物理学报》2011,60(3):37701-037701
采用固相反应法制备了一系列CaCu3Ti4O12-xMgTiO3(x = 0, 0.25, 0.5, 1.0)复相陶瓷,研究了MgTiO3掺杂对CaCu3Ti4O12(CCTO)陶瓷相结构、显微组织、介电性能和I-V非线性特征的影响.研究发现:MgTiO3掺杂不仅使CC 关键词: I-V非线性系数')" href="#">I-V非线性系数 巨介电常数 压敏电压  相似文献   

5.
脉冲电容器用细电滞回线铁电陶瓷材料的研究   总被引:2,自引:0,他引:2       下载免费PDF全文
陈学锋  李华梅  李东杰  曹菲  董显林 《物理学报》2008,57(11):7298-7304
采用低锆区的Pb(Zr0.42Sn0.40Ti0.18)O3(PZST42/40/18)铁电陶瓷为基, 通过少量La和Ba取代Pb同时Nb取代(Zr, Sn, Ti)复合取代的方法得到掺杂PZST42/40/18细电滞回线铁电陶瓷, 其最大极化强度Pmax≈20.66μC/cm2, 剩余极化强度Pr≈0.55μC/cm关键词: 细电滞回线 铁电陶瓷 PZST 脉冲电容器  相似文献   

6.
郑分刚  陈建平  李新碗 《物理学报》2006,55(6):3067-3072
选用不同浓度的Pb(Zr0.52Ti0.48)O3溶胶,用Sol-gel法在Pt/Ti/SiO2/Si基片上沉积一层厚度不同的Pb(Zr0.52Ti0.48)O3 (PZT52)过渡层,经400℃烘烤、550℃退火等程序后,再用Sol-gel法在PZT52过渡层上沉积Pb(Zr0.52Ti0.48)O 关键词: PZT铁电薄膜 择优取向 过渡层 剩余极化强度  相似文献   

7.
王强 《物理学报》2010,59(9):6569-6574
利用固相反应法制备了Bi0.5Ca0.5Mn1-xCoxO3(0≤x≤0.12)系列多晶样品.研究了Co掺杂对Bi0.5Ca0.5MnO3电荷有序的影响.结果表明,Co掺杂导致电荷有序相逐渐融化、铁磁相互作用的增强;当x≥0.08时,电荷有序转变峰完全消失,但残留的反铁磁电荷有 关键词: 钙钛矿锰氧化物 电荷有序 团簇玻璃 相分离  相似文献   

8.
刘鹏  贺颖  李俊  朱刚强  边小兵 《物理学报》2007,56(9):5489-5493
采用固相反应法制备了CaCu3Ti4-xNbxO12(x=0,0.01,0.04,0.08,0.2)陶瓷,样品在x取值范围内形成了连续固溶体.在40Hz—110MHz频率范围对样品进行了介电频谱分析,实验结果表明,与纯CaCu3Ti4O12不同,含Nb试样除了在频率大于10kHz范围内出现的德拜弛豫 关键词: 巨介电常数 德拜弛豫 阻挡层电容 等效电路  相似文献   

9.
通过对(1-x)(K0.5Na0.5)NbO3-xSrTiO3(0≤x≤0.15)陶瓷的相组成、晶体结构和介电性能的研究发现,该陶瓷为单一的钙钛矿结构相.当x含量较小(x<0.1)时为正交相结构,x≥0.1时转变为四方相结构.随着SrTiO3掺杂量的增加,样品的致密度增加,样品由正常铁电相逐渐向弥散铁电相转变,且相 关键词: 弛豫铁电体 0.5Na0.5)NbO3铁电陶瓷')" href="#">(K0.5Na0.5)NbO3铁电陶瓷 3掺杂')" href="#">SrTiO3掺杂 相变温度  相似文献   

10.
测量了使用溶胶-凝胶工艺制备的(Bi0.5Na0.5)1-xBaxTiO3(x=0.00,0.04,0.06,0.08,0.12)系陶瓷的介电、压电、铁电和热释电性能.由于使用了溶胶-凝胶工艺制备的粉料,因此所有样品的压电性能都得到了较大提高.其中(Bi0.5Na0.5)0.94Ba0.06TiO.3系陶瓷具有该系列最大的压电常数,d33=173×10-12C/N,与传统工艺相比,d33提高了近40%.同时,在一定范围内,随Ba含量的增加,材料的剩余极化Pr和矫顽场Ec逐渐减小,退极化温度逐渐降低.对于(Bi0.5Na0.5)0.94Ba0.06TiO.3系陶瓷,剩余极化和矫顽场分别为25μC/cm2和28kV/cm,退极化温度约为80℃. 关键词: 溶胶-凝胶 压电常数 剩余极化 矫顽场  相似文献   

11.
In this work, ((1−x)Ba(Fe1/2Ta1/2)O3-xBa(Zn1/3Ta2/3)O3), ((1−x)BFT-xBZT) ceramics with x = 0.00–0.12 were synthesized by the solid–state reaction method. X-ray diffraction data revealed that both the powders and ceramics were of a pure-phase cubic perovskite structure. All ceramics showed large dielectric constants. For the x = 0.12 sample, a very high dielectric constant (>20,600) was observed. A lowering in the dielectric loss compared to pure BFT ceramics was observed with the BZT addition. The impedance measurements indicated that BZT has a strong effect on the bulk grain and grain boundary resistance of BFT ceramics. These results are in agreement with the measured dielectric properties. Based on dielectric and impedance results, (1−x)BFT-xBZT ceramics could be of great interest for high performance dielectric materials applications due their giant dielectric constant behavior.  相似文献   

12.
田晓霞  屈绍波  杜红亮  李晔  徐卓 《中国物理 B》2012,21(3):37701-037701
The piezoelectric, dielectric, and ferroelectric properties of the (LiCe) co-substituted calcium bismuth niobate (CaBi2Nb2O9, CBNO) are investigated. The piezoelectric properties of CBNO ceramics are significantly enhanced and the dielectric loss tanδ decreased. This makes poling using (LiCe) co-substitution easier. The ceramics (where □ represents A-site Ca2+ vacancies, possess a pure layered structure phase and no other phases can be found. The Ca0.88(LiCe)0.040.04Bi2Nb2O9 ceramics possess optimal piezoelectric properties, with piezoelectric coefficient (d33) and Curie temperature (TC) found to be 13.3 pC/N and 960 ℃, respectively. The dielectric and piezoelectric properties of the (LiCe) co-substituted CBNO ceramics exhibit very stable temperature behaviours. This demonstrates that the CBNO ceramics are a promising candidate for ultrahigh temperature applications.  相似文献   

13.
In the study, in order to develop the lead-free piezoelectric ceramics for actuator, transformer and other electronic-devices application, (K0.5Na0.5)(Nb0.9+xTa0.1)O3 + 0.5 mol% CuO + 0.2 mol% MnO2 ceramics were prepared by conventional mixed oxide method. The effects of B-site non-stoichiometry in [(K0.5Na0.5)] [(Nb0.9+xTa0.1)O3] ceramics on microstructure and piezoelectric properties were investigated. The density, electromechanical coupling factor (kp), mechanical quality factor (Qm), piezoelectric constant (d33), TC and TO-T of NKNT ceramics with x = 0.0065 showed the optimum values of 4.58 g/cm3, 0.427, 1554, 109 pC/N, 373 °C and 226 °C, respectively, suitable for piezoelectric motor, and transformer applications.  相似文献   

14.
High piezoelectric and electromechanical properties were reported in the PbHfO3–PbTiO3–Pb(Mg1/3Nb2/3)O3 ternary system with morphotropic phase boundary (MPB) compositions. This work focuses on the effect of MnO2 addition on 0.8Pb(Hf0.443Ti0.557)O3–0.2PMN (0.8PHT–0.2PMN) ceramics. It was observed that the Mn acceptor modification induced a “hardening” effect in 0.8PHT–0.2PMN, with decreased piezoelectric coefficients d33 and dielectric loss tan δ and a significantly increased mechanical quality factor Qm. Moreover, the 0.2 wt% MnO2‐doped 0.8PHT–0.2PMN ceramics exhibited good piezoelectric and electromechanical properties with d33, planar electromechanical coupling kp and Qm being on the order of 360 pC/N, 61% and 700, respectively, showing advantages compared to those of commercial hard PZT4 ceramics, which is attractive for high power applications. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献   

15.
In the present work, lead-free piezoelectric ceramics (Na0.5Bi0.5)TiO3xCuO–yNiO (for x = 0.0, 0.02, 0.04 and 0.06) have been prepared by a conventional solid-state reaction method. An investigation of CuO and NiO doping in bismuth sodium titanate (BNT) and a study of the structure, morphology, and dielectric and ferroelectric properties of the NBT–CuNi system have been conducted. Phase and microstructural analysis of the (Na0.5Bi0.5)TiO3 (NBT) based ceramics has been carried out using X-ray diffraction and scanning electron microscopy (SEM) techniques. Field emission scanning electron microscopy (FE-SEM) images showed that inhibition of grain growth takes place with increasing Cu and Ni concentration. The results indicate that the co-doping of NiO and CuO is effective in improving the dielectric and ferroelectric properties of NBT ceramics. Temperature-dependent dielectric studies have also been carried out at room temperature to 400 °C at different frequencies. The NBT ceramics co-doped with x = 0.06 and y = 0.06 exhibited an excellent dielectric constant ?r = 1514. The study suggests that there is enormous scope of application of such materials in the future for actuators, ultrasonic transducers and high-frequency piezoelectric devices.  相似文献   

16.
Effects of BiFeO3 (BFO) content on the microstructure and electrical properties of Ba0.85Ca0.15Ti0.90Zr0.10O3 (BCTZ) ceramics prepared by normal sintering in air were investigated. A stable solid solution is formed between BCTZ and BFO. The grain size gradually becomes smaller, and the ceramics become denser with increasing the BFO content. The Curie temperature, dielectric constant, and dielectric loss of BCTZ ceramics decrease simultaneously with the introduction of BFO. Moreover, the remanent polarization reaches a maximum at x = 0.2 mol%, and the coercive field continuously increases with increasing the BFO content due to the introduction of BFO with a higher coercive field. Improved piezoelectric properties (d33 ∼ 405 pC/N and kp ∼ 0.44) are demonstrated for the BCTZ ceramic with x = 0.2 mol%.  相似文献   

17.
In this study, ceramics in Mn-doped ((Ka0.5Na0.5)0.935Li0.065)NbO3 ceramics (Mn content = 0.25, 0.50, 1.00 and 1.50 mol%) were successfully prepared by the conventional mixed-oxide technique. The crystal structure was identified by XRD as a single-phase perovskite structure with tetragonal symmetry. The valence of Mn ions, characterized by the synchrotron XAS technique, was seen to change from Mn4+ to Mn3+ during the formation of the crystal. The valence state of Mn strongly affected the crystal structure and ferroelectric properties of the ceramics. The ferroelectric parameters show the decrease of remnant polarization and the increase of the coercive field with increasing MnO2 content. The results confirm the Mn3+ in KNNL perovskite lattices, leading to the formation of oxygen vacancies and hardening effects.  相似文献   

18.
向军  郭银涛  褚艳秋  周广振 《物理学报》2011,60(2):27203-027203
采用有机凝胶法结合高温烧结制备了Sm0.9Sr0.1Al1-xCoxO3-δ (SSAC,x = 0.2,0.4,0.5,0.6) 系列钙钛矿结构混合导电陶瓷,并详细讨论了烧结温度和Co掺杂量对其晶体结构、相组成和电性能的影响.X射线衍射结果显示,过高的烧结温度或Co掺杂量都会导致杂相Sm(Sr)CoO3生成,Co在该体系的固溶限位于50mol%—60mol%之间,Co对Al的部分取代使晶格体积增大.电性能测量结果表明,SSAC陶瓷的电导率主要取决于p型电导,其导电行为符合小极化子跳跃导电机制;随着烧结温度的升高,材料的电导率逐渐增大;在固溶限内随Co含量的增加,SSAC陶瓷的电导率增大,表观活化能减小;1200 ℃烧结10 h制得的单相Sm0.9Sr0.1Al0.5Co0.5O3-δ陶瓷体在800℃的电导率达63.4 S/cm,表观活化能为0.14eV.具有良好电性能的SSAC导电陶瓷有望应用于高温电化学领域. 关键词: 导电陶瓷 3')" href="#">Sr和Co掺杂的SmAlO3 有机凝胶法 电性能  相似文献   

19.
Phase formation study in lead-free piezoelectric ceramics based on lanthanum doped bismuth sodium titanate (Bi0.4871Na0.4871La0.0172TiO3:BNLT) and zirconium doped barium titanate (BaZr0.05Ti0.95O3:BZT), has been carried out in the system of (1−x)BNLT–xBZT where x = 0.0–1.0, by two-step mixed oxide method. It was observed that the addition of BZT in the BNLT ceramics developed the dielectric and piezoelectric properties of the ceramics with the optimum piezoelectric constant (d33) and dielectric constant (εr) at room temperature of about 138 pC/N and 1651, respectively, from the 0.2 BNLT to 0.8 BZT ceramic sample. The Curie temperature (TC) of this ceramic was found at 295 °C which is 195 °C higher than that of pure BZT ceramics, promising the use of this ceramic in a higher range of temperature.  相似文献   

20.
ABSTRACT

Lead-free (Na0.5Bi0.5)1?xSrxTiO3 (x = 0, 0.04 and 0.06) ceramics with relative densities above 97% were prepared by solid-state synthesis process. Their dielectric, thermal and Raman properties were studied. X-ray diffraction analysis shows perovskite structure with rhombohedral symmetry at room temperature. Sr doping of Na0.5Bi0.5TiO3 (NBT) results in an increase of the dielectric permittivity, diffusing of the permittivity maximum and its shift toward lower temperatures. The temperature of the rhombohedral–tetragonal phase transition indicated by the differential scanning calorimetry (DSC) peak and relaxational dielectric anomaly near the depolarization temperature are also shifted toward lower temperatures. The observed increase and broadening of the permittivity maximum, enhancement of the dielectric relaxation near the depolarization temperature, broadening of the DSC anomaly related to the rhombohedral–tetragonal phase transition and broadening of the Raman bands with increasing Sr content are attributed to the increase of the degree of cationic disorder and evident enhancement of the relaxor-like features in NBT–xST. This enhancement could play a positive role in the improvement of the piezoelectric performance of NBT-based ceramics.  相似文献   

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