Colossal Dielectric Permittivity in Tetragonal Pb(Fe1/2Nb1/2)1-xTixO3 Single Crystals

2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2007-05-27 DOI:10.1109/ISAF.2007.4393334

C.-T. Tseng, C. Tu, F.-T. Wang

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Abstract

It has been a goal to find high dielectric permittivity and Curie temperature in high-strain crystals to enhance piezoelectric coefficient and thermal stability. Dielectric permittivity has been measured as functions of temperature and frequency in (001)-cut Pb(Fe_1/2Nb_1/2)_1-xTi_xO₃ (PFNTx) single crystals with starting composition at x=0.48. The tetragonal PFNT single crystals exhibit giant dielectric permittivity, high Curie (or depolarization) temperature, and low electric resistance, which are sensitive to Fe ion content, measured frequency, and thermal annealing treatment. A first-order-type tetragonalrarrcubic phase transition takes place at T_Ccong515 K. Ac electric conductivity increases with temperature dramatically, likely due to vacancy hopping and valance reduction of Fe3+ to Fe2+ ions. This study suggests that Fe ion is a promising candidate for dopant to enhance dielectric permittivity and depolarization temperature in Pb(Mg_1/3Nb_2/3)_1-xTixO₃ (PMNT) and Pb(Zn_1/3Nb_2/3)_1-xTixO₃ (PZNT) crystals.

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四方Pb(Fe1/2Nb1/2)1-xTixO3单晶的大介电常数

在高应变晶体中寻找高介电常数和居里温度是提高压电系数和热稳定性的目标。在起始成分为x=0.48的(001)切割的Pb(Fe1/2Nb1/2)1-xTixO3 (PFNTx)单晶中，测量了介电常数作为温度和频率的函数。方形PFNT单晶具有高介电常数、高居里(或退极化)温度、低电阻等特点，对铁离子含量、被测频率和热退火处理敏感。在tc聪515k发生了一阶四边形非立方相变。交流电导率随着温度的升高而急剧增加，可能是由于空位跳变和Fe3+到Fe2+离子的价降。研究表明，Fe离子是提高Pb(Mg1/3Nb2/3)1-xTixO3 (PMNT)和Pb(Zn1/3Nb2/3)1-xTixO3 (PZNT)晶体介电常数和退极化温度的有希望的掺杂剂。

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2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics

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