等静压和温度诱导的PbLa(Zr,Sn,Ti)O_3反铁电陶瓷相变和介电性能研究

HYDROSTATIC PRESSURE AND TEMPERATURE INDUCEDPHASE TRANSITION AND DIELECTRIC PROPERTIES OF La-DOPED Pb(Zr,Sn,Ti)O_3 ANTIFERROELECTRIC CERAMICS

研究了等静压和温度诱导掺镧La的Pb(Zr,Sn ,Ti)O3(PLZST)陶瓷材料的铁电 反铁电相变、介电压力谱和介电温度谱 ,研究了温度对压致相变和介电压力谱的影响 ,结果发现温度使铁电 反铁电相变压力降低 ,介电压力谱具有明显的扩散相变和频率弥散的特点 ;研究了等静压对介电温度谱的影响 ,结果表明等静压使铁电 反铁电相变温度降低 ,反铁电 顺电相变温度升高 .这些现象有利于丰富和拓宽人们对温度和压力诱导的多组元弛豫型铁电体和弛豫型反铁电体扩散相变和弛豫行为的认识和理解 .

Hydrostatic pressure and temperature induced phase transition and dielectric properties of La-doped Pb(Zr,Sn,Ti)O 3 antiferroelectric ceramics were studied. The effects of temperature on the pressure-induced phase transition and the dielectric property dependence on pressure have been investigated.It was found that rise of temperature makes the ferroelectric-antiferroelectric phase transition pressure decrease.And it was observed that hydrostatic pressure makes the ferroelectric-antiferroelectric phase transition temperature decrease and the antiferroelectric-paraelectric phase transition temperature increase.The results are of help in understanding the behaviors of pressure-induced dielectric frequency dispersion and diffuse phase transition exising in the antiferroelectric ceramics with composition and polar nanodomain fluctuations.