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中文摘要：
采用高温熔融法制备出了尺寸达5mm×3mm×1mm的（K0.45Na0.55）NbO3（KNN）无铅铁电晶体.XRD测试结果表明KNN晶体结构为纯的钙钛矿正交相结构,晶体的显露面为〈001〉结晶面.SEM显微结构分析表明晶体沿[001]方向呈现层状生长台阶,采用负离子配位多面体生长基元模型解释了晶体层状台阶的生长机理.研究了晶体样品在室温至500℃温度范围内的介电性能,两个介电异常峰出现在240和405℃,分别对应正交铁电-四方铁电以及四方铁电-立方顺电相相变温度.采用修正后的居里外斯定律研究了KNN晶体的介电弛豫特性,结果表明KNN晶体的介电弛豫特性接近于普通铁电体特征.
英文摘要：
Lead-free piezoelectric 〈001〉-oriented KNN crystals each with a dimension of 5 mm×3 mm×1 mm are obtained by melt grown technique.The room temperature crystal structure of orthorhombic perovskite-type lattice is determined from XRD measurment.The SEM observation reveals the growth steps aligning approximately along the [001] direction.Base on the model of negative ion coordination polyhedrons,it is explained that the layer growth mechanism is dominant for the 〈001〉 face.Two phase transition temperatures of orthorhombic-to-tetragonal（O-to-T） and tetragonal-to-cubic（T-to-C） are around 240 ℃ and 405 ℃ for KNN crystals according to the dielectric measurements,respectively.A linear fitting of the modified Curie-Weiss law to experimental data shows that the normal ferroelectric property is dominant for KNN crystal.
同期刊论文项目
同项目期刊论文
Electronic and Optical Properties of KNbO3,NaNbO3 and K0.5Na0.5NbO3 in Paraelectric Cubic Phase: a C
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