硅酸盐学报

Ba0.98Bi0.02(Ti0.9Zr0.1)1-xCuxO3陶瓷的介电弛豫特征

作者：王久石丁士华宋天秀那文菊王岩

分类号：TM22+1

出版年,卷(期):页码：2011,39(6):54-60

DOI：

摘要：

采用固相反应法制备Ba0.98Bi0.02(Ti0.9Zr0.1)1-xCuxO3 (x = 0，0.01，0.02，0.03，摩尔分数)陶瓷。X射线衍射分析结果表明：所有样品均为四方晶体结构，摩尔分数为2%的Cu2+能够完全溶入Ba0.98Bi0.02(Ti0.9Zr0.1)O3陶瓷晶格中。Ba0.98Bi0.02(Ti0.9Zr0.1)1-xCuxO3陶瓷不同频率的介电温谱显示：所有样品均具有弥散相变的特征，当x = 0、0.02、0.03时，样品有典型弛豫铁电体的特征。当x = 0.01时，剩余极化强度达到最大值，为2.83 μC/cm，矫顽场达到最大值，为3.07 kV/cm。基于纳米极性微区和局域无规场的理论解释了弛豫铁电体和带有弥散相变的铁电体之间的关系，即当由价态差异和缺陷引发的局域无规场相对较强且测试频率与纳米极性微区的弛豫频率相近时，在弥散相变温度区间内的介电弛豫行为才能被观察到；而局域无规场很弱的情况下，介电弛豫行为只有在更高的频率下才能被观察到。

Ba0.98Bi0.02(Ti0.9Zr0.1)1-xCuxO3 (x = 0, 0.01, 0.02, 0.03, mole fraction) ceramics were prepared by the solid state reaction process. The X-ray diffraction analysis indicates that all of ceramic samples have a tetragonal crystal structure, and 2% (in mole) Cu2+ doping can be fully incorporated into the perovskite lattice of Ba0.98Bi0.02(Ti0.9Zr0.1)O3 ceramic. Dielectric constants vs temperature at different frequencies show that all of the ceramics have ferroelectrics characteristics with diffused phase transition, and the ceramic samples with x = 0, 0.02, 0.03 exhibit typical relaxor ferroelectric characteristics. Maximum values of remnant polarization and coercive field are 2.83 μC/cm2 and 3.07 kV/cm at x = 0.01.Relationships between ferroelectrics with diffused phase transitions and relaxor ferroelectrics based on the polar nanoregion model and local random field model were investigated. Dielectric relaxation can be observed when the local random field induced by the difference of the charge and defects are stronger, and test frequency is close to the relaxation frequency of the polar nanoregion at the temperature of the diffused phase transition. Comparatively speaking, dielectric relaxation can be observed at a higher test frequency when the local random field is weaker.

基金项目：

国家自然科学基金(11074203)，校人才基金(R0620109)，西华大学材料学重点学科(XZD0814-09-1)及西华大学研究生创新基金(YCJJ200924)资助项目。

作者简介：

硕士研究生

参考文献：

[1] WEI Xiaoyong, FENG Yujun, YAO Xi. Dielectric relaxation behavior in barium stannate titanate ferroelectric ceramics with diffused phase transition [J]. Appl Phys Lett, 2003, 83(10): 2031-2033. [2] SMOLENSKY G A. Physical phenomena in ferroelectrics with diffuse phase transition [J]. J Phys Soc Jpn, 1970, 28 (Suppl): 26-37. [3] SETTER N, CROSS L E. The role of B-site cation disorder in diffuse phase transition behavior of perovskite ferroelectrics [J]. J Appl Phys, 1980, 51(8): 4356-4360. [4] YAO Xi, CHEN Zhili, CROSS L E. Polarization and depolarization behavior of hot pressed lead lanthanum zirconate titanate ceramics [J]. J Appl Phys,1983, 54(6): 3399-3403. [5] CROSS L E. Relaxor ferroelectrics [J]. Ferroelectrics, 1987, 76: 241-267. [6] WESTPHAL V, KLEEMANN W, GLINCHUK M D. Diffuse phase transitions and random-field-induced domain states of the "relaxor" ferroelectric PbMg1/3Nb2/3O3 [J]. Phys Rev Lett, 1992, 68(6): 847-850. [7] BAHRI F, KHEMAKHEM H, SIMON A, et al. Dielectric and pyroelectric studies on the Ba1?3aBi2aTiO3 classical and relaxor ferroelectric ceramics [J]. Solid State Sci, 2003, 5(9): 1235-1238. [8] TANG X G, CHEW K H, CHAN H L W. Diffuse phase transition and dielectric tunability of Ba(ZryTi1-y)O3 relaxor ferroelectric ceramics [J]. Acta Mater, 2004, 52(17): 5177-5183. [9] WANG Xiaoli, LI Bo. Dielectric audio-frequency dispersion in Ba(Ti1-x? Snx)O3 ferroelectrics solid [J]. Solid State Commun, 2009, 149(13/14): 537-539. [10] 陈涛, 丁士华, 张红霞, 等. Ba(Ti0.91Zr0.09)0.99Al0.01O3陶瓷的介电弛豫特性[J]. 压电与声光, 2009, 31(3): 404-407. CHEN Tao, DING Shihua, ZHANG Hongxia, et al. Piezoelectr Acoustooptics (in Chinese), 2009, 31(3): 404-407. [11] DING Shihua, WU Wei, CHEN Tao, et al. Relaxor properties of Ba0.955Li0.09(Ti0.91Zr0.09)O3 ceramic doped with MoO3 [J]. Ferroelectrics, 384(1): 25-31. [12] CHOU Xiujian, ZHAI Jiwei, YAO Xi. Relaxor behavior and dielectric properties of La2O3-doped barium zirconium titanate ceramics for tunable device applications [J]. Mater Chem Phys, 2008, 109(1): 125- 130. [13] UCHINO K, NOMURA S, CROSS L E, et al. Soft modes in relaxor ferroelectric [J] . Phase Transit, 1981, 2(1): 1-6. [14] BIDAULT O, HUSSON E, GAUCHER P. Substitution effects on the relaxor properties of lead magnesium niobate ceramics [J]. Philos Mag B, 1999, 79(3): 435-448. [15] KE Shanming, FAN Huiqing, HUANG Haitao, et al. Dielectric dispersion behavior of Ba(ZrxTi1?x)O3 solid solutions with a quasiferroelectric state [J]. J Appl Phys, 2008, 104(3): 034108-1-7. [16] KE Shanming, FAN Huiqing, HUANG Haitao, et al. Lorentz-type relationship of the temperature dependent dielectric permittivity in ferroelectrics with diffuse phase transition [J]. Appl Phys Lett, 2008, 93(11): 112906-1-3. [17] BOKOV A A, Ye Z G. Phenomenological description of dielectric permittivity peak in relaxor ferroelectrics [J]. Solid State Commun, 2000, 116(2): 105-108. [18] BOKOV A A, MAGLIONE M, SIMON A, et al. Dielectric behavior of Ba(Ti1-xZrx)O3 solid solution [J]. Ferroelectrics, 2006, 337: 169-178. [19] LEI C, BOKOV A A, Ye Z G. Relaxor behavior in Ba(Ti0.72Sn0.28)O3 solid solution [J]. Ferroelectrics, 2006, 339: 129-136. [20] CHENG Z Y, KATIVAR R S, YAO X, et al. Dielectric behavior of lead magnesium niobate relaxors [J]. Phys Rev B,1997, 55(13): 8165-8174. [21] CHENG Z Y, KATIVAR R S, YAO X, et al. Temperature dependence of the dielectric constant of relaxor ferroelectrics [J]. Phys Rev B, 1998, 57(14): 8166-8177. [22] TAGANTSEV A K, GLAZOUNOV A E. Mechanism of polarization response in the ergodic phase of a relaxor ferroelectric [J]. Phys Rev B, 1998, 57(1): 18-21. [23] 云斯宁, 王晓莉. (Bal-xSrx/2Cax/2)TiO3陶瓷的介电弛豫特征和铁电性能[J]. 硅酸盐学报, 2006, 34(2): 142-146. YUN Sining, WANG Xiaoli. J Chin Ceram Soc (in Chinese), 2006, 34(2): 142-146.

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