采用顶部籽晶法生长了一系列不同组分的高居里温度铌镥酸铅-钛酸铅[(1-x)Pb(Lu1/2Nb1/2)O3-xPbTiO3(PLN-xPT)]铁电晶体.该晶体在三方相区域表现出典型的介电弛豫特性,不同组分的晶体表现出了较高的居里温度;基于介电和结构测试结果,得到了该体系的低温二元体系相图,在相图中存在一个准同型相界区域(MPB),其组分位于x=0.49～ 0.51;利用偏光显微镜分析晶体电畴结构得到和X射线粉末衍射测试结果吻合的相结构;电学性能测试结果表明不同组分的晶体性能差异较大.组分位于MPB附近的晶体表现出优异的压电性能,如x=0.49时,居里温度Tc=360℃,压电常数d33＞ 1600 pC/N.处于MPB附近的晶体存在较大的矫顽Ec＞ 10 kV/cm,一些组分晶体的三方-四方相变温度TRT＞ 200℃.结果表明高的居里温度及优异的压电性能使二元铌镥酸铅-钛酸铅晶体具有更大的温度应用范围及更广阔的应用前景.
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