采用传统陶瓷制备方法,制备了无铅新压电陶瓷材料Na1/2Bi1/2TiO3-xBaNb2O6.研究了BaNb2O6掺杂对(Na1/2Bi1/2)TiO3陶瓷晶体结构、介电性能与介电弛豫行为的影响.XRD分析表明,在所研究的组成范围内陶瓷材料均能够形成纯钙钛矿固溶体.材料的介电常数-温度曲线显示陶瓷具有两个介电反常峰Tf和Tm,修正的居里一外斯公式较好的描述了陶瓷弥散相变特征,弥散指数随BaNb2O6掺杂量的增加而增加.该体系陶瓷表现出与典型弛豫铁电体明显不同的弛豫行为,低掺杂量的陶瓷仅在低温介电反常峰Tf附近表现出明显的频率依赖性,而高掺杂的陶瓷材料在室温和Tf之间都表现出明显的频率依赖性.并根据宏畴一微畴转变理论探讨了该体系陶瓷产生介电弛豫的机理.
参考文献
| [1] | Hiruma Y;Nagata H;Takenaka T .Phase transition tem-peratures and piezoelectric properties of (Bi1/2Na1/2)TiO3-(Bi1/2Na1/2)TiO3-BaTiO3 lead-free piezoelectric ce-ramics[J].Japanese Journal of Applied Physics,2006,45(9B):7409-7412. |
| [2] | Marchet P;Boucher E;Dorcet V .Dielectric properties of some low-lead or lead-free perovskite-derived materi-als:Na0.5 Bi0.5 TiO3-PbZrO3,Na0.5Bi0.5TiO3-BiScO3and Na0.5Bi0.5TiO3-BiFeO3 ceramics[J].Journal of the European Ceramic Society,2006,26:3037-3041. |
| [3] | Pengpat K;Hanphimol S;Eitssayeam S .Morphotropic phase boundary structure and dielectrical properties of Lead-free bismuth sodium lanthanum titanate-barium titanate ceramics[J].Journal of Electroceramics,2006,16:301-305. |
| [4] | Salak A N;Vyshatko N P;Kholkin A L .Processing and characterization of (1-x) (Na1/2Bi1/2)TiO3-x La (Mg1/2Ti1/2)O3[J].Materials Science Forum,2006,514-516:250-254. |
| [5] | Wataru Sakamoto;Masanari Mizuno;Toshiaki Yamaguchl .Fabrication and properties of Er-substituted BaNb_2O_6 thin films through a chemical route[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2006(0):538-542. |
| [6] | Yoshii K;Hiruma Y;Nagata H .Electrical properties and depolarization temperature of (Bi1/2Na1/2)TiO3-(Bi1/2K1/2) TiO3 lead-free piezoelectric ceramics[J].Japanese Journal of Applied Physics Letters,2006,45(5B):4493-4496. |
| [7] | Uchino K;Nomura S.Critical exponents of the dielectric constant in diffused phase Transition crystals[J].Ferroelectrics,Letters Section,1982(44):55-56. |
| [8] | Smolensky G A;Agranovus A I.Dielectric properties of complex compound[J].Soviet physics Solid State,1995(01):1429-1437. |
| [9] | Cross L E.Relaxor ferroelectrics[J].Ferroelectrics,1988(67):241-246. |
| [10] | Schmidt G.Cubicallys tabilized perovskites[J].Ferroelectrics Letters,1990(104):205-216. |
| [11] | Westphal V;Kleemann W.Diffuse phase transitions and random-field-induced domain states of the relaxor ferro-electric Pb(Mg2/3Nb1/3) O3[J].Physical Review Letters,1992(68):847-850. |
| [12] | 姚熹;陈至立.弛豫型铁电体[J].压电与声光,1984(06):1-11. |
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