用传统的陶瓷工艺、通过B位氧化物预合成法制备了高质量、钙钛矿结构的0.20Pb(Fe1/2Nb1/2)O3-0.32PbZrO3-0.48PbTiO3(PFN20-PZ32-PT48)铁电陶瓷,该条件下制备的铁电陶瓷呈现相当均匀的微结构和良好的电学性能.PFN20-PZ32-PT48具有较大的室温介电常数(～410)、高的居里温度(TC,～350℃),在295K＜T＜525K温度区间,具有较小的介电常数温度梯度(a)ε/(a)T=2.8/℃,并且介电常数与频率无关,特别适合高温电容器工业的应用.虽然PFN20-PZ32-PT48呈现较为典型的一级铁电相变,其介电性能在顺电相区呈现明显的频率色散现象,并伴随着介电常数和损耗的反常增加.该反常现象的产生可能与陶瓷烧结过程中Fe3+被部分还原成Fe2+离子所诱导产生的热激发的空穴导电机制有关.PFN20-PZ32-PT48的剩余极化(Pr)与频率的关系可以很好地用随机场模型模拟,表明其弛豫行为的产生与短程化学有序所诱导产生的极性簇和/或纳米尺寸的非均匀性有关.
参考文献
| [1] | Jungho Ryu;Shashank Priya;Kenji Uchino .High-T_(m) relaxor ferroelectrics: 0.3BiScO_(3)-0.6PbTiO_(3)-0.1Pb(Mn_(1/3)Nb_(2/3))O_(3)[J].Applied physics letters,2003(2):251-253. |
| [2] | Haumont R.;Dkhil B.;Kiat JM.;Al-Barakaty A.;Dammak H.;Bellaiche L. .Cationic-competition-induced monoclinic phase in high piezoelectric (PbSc1/2Nb1/2O3)(1-x)-(PbTiO3)(x) compounds - art. no. 014114[J].Physical review, B. Condensed matter and materials physics,2003(1):4114-0. |
| [3] | Eitel RE.;Shrout TR.;Rehrig PW.;Hackenberger W.;Park SE.;Randall CA. .New high temperature morphotropic phase boundary piezoelectrics based on Bi(Me)O-3-PbTiO3 ceramics[J].Japanese journal of applied physics,2001(10):5999-6002. |
| [4] | Shrout T R;Halliyal A .[J].American Ceramic Society Bulletin,1987,66(04):704-711. |
| [5] | Viehland D;Jang S J;Cross L E;Wuttig M .[J].Journal of Applied Physics,1990,68(06):2916-2921. |
| [6] | B. Noheda .Structure and high-piezoelectricity in lead oxide solid solutions[J].Current opinion in solid state & materials science,2002(1):27-34. |
| [7] | Z.-G. Ye .Crystal chemistry and domain structure of relaxor piezocrystals[J].Current opinion in solid state & materials science,2002(1):35-44. |
| [8] | Ananta S;Thomas N W .Relationships between Sintering Conditions,Microstructure and Dielectric Properties of Lead Iron Niobate[J].Journal of the European Ceramic Society,1999,19:1873-1881. |
| [9] | Noheda B;Gonzalo J A et al.Tetragonal-to-monoclinic phase transition in a ferroelectric perovskite:the structure of PbZr0.52 Ti0.48 O3[J].Physical Review B,2000,61(13):8687-8695. |
| [10] | Fang B;Shan Y;Tezuka K;Imoto H .Synthesis and characterization of pseudo-ternary Pb(Fe1/2Nb1/2)O-3-PbZrO3-PbTiO3 ferroelectric ceramics via a B-site oxide mixing route[J].Journal of Materials Science,2005(24):6445-6451. |
| [11] | Rao RMV.;Umarji AM.;Halliyal A. .PEROVSKITE PHASE FORMATION IN THE RELAXOR SYSTEM [PB(FE1/2NB1/2)O-3](1-X)-[PB(ZN1/3NB2/3)O-3](X)[J].Journal of the American Ceramic Society,1996(1):257-260. |
| [12] | Begg B D;Vance E R;Nowotny J E .[J].Journal of the American Ceramic Society,1994,77:3186-3192. |
| [13] | Sun-Gon Jun;Nam-Kyoung Kim .PHASE DEVELOPMENT AND DIELECTRIC PROPERTIES OF THE Pb(Fe(1/2)Nb(1/2)O_3-SUBSTITUTED Pb(Fe(2/3)W(1/3)O_3-Pb(Mg(1/3)Nb(2/3)O_3 SYSTEM[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,1999(4):613-620. |
| [14] | Fang Bijun;Shan Yuejin;Tezuka K;Imoto H .Improvement of dielectric properties in iron-contained ferroelectrics[J].Japanese Journal of Applied Physics,2005,44(7A):5030-5034. |
| [15] | Imry Y;Ma Shang-keng .[J].Physical Review Letters,1975,35(21):b1399-b1401. |
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