物理学报2011，Vol.60Issue(10)：668-673,6.
（K0.45Na0.55）NbO3无铅压电晶体的生长形态与介电性能研究
Micro-morphology and dielectric properties for（K0.45Na0.55）NbO3 lead-free piezoelectric crystal
摘要
Abstract
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.关键词
（K0.45Na0.55）NbO3晶体/无铅/晶体结构/介电性能Key words
（K0.45Na0.55）NbO3 crystal/lead-free/crystal structure/dielectric property分类
数理科学引用本文复制引用
陈超,江向平,卫巍,李小红,魏红斌,宋福生..（K0.45Na0.55）NbO3无铅压电晶体的生长形态与介电性能研究[J].物理学报,2011,60(10):668-673,6.基金项目
国家自然科学基金 （）
江西省高等学校“先进陶瓷材料”科技创新团队、江西省主要学科学术和技术带头人培养对象计划 （）
江西省教育厅项目（批准号：GJJ11196）资助的课题 （）
