| (K0.45Na0.55)NbO3无铅压电晶体的生长形态与介电性能研究 |
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| 引用本文： | 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):107704-107704. |
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| 作者姓名： | 陈超 江向平 卫巍 李小红 魏红斌 宋福生 |
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| 作者单位： | 江西省先进陶瓷材料重点实验室,景德镇陶瓷学院材料学院,景德镇 333001 |
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| 基金项目： | 国家自然科学基金(批准号: 50862005, 51062005, 91022027)、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(批准号: 2010DD00800)和江西省教育厅项目(批准号: GJJ11196)资助的课题. |
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| 摘 要： | 采用高温熔融法制备出了尺寸达5 mm×3 mm×1 mm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.
关键词：
0.45Na0.55)NbO3晶体')" href="#">(K0.45Na0.55)NbO3晶体
无铅
晶体结构
介电性能
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| 关 键 词： | (K0.45Na0.55)NbO3晶体 无铅 晶体结构 介电性能 |
| 收稿时间： | 2011-01-20 |
Micro-morphology and dielectric properties for (K0.45Na0.55)NbO3 lead-free piezoelectric crystal |
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| Chen Chao,Jiang Xiang-Ping,Wei Wei,Li Xiao-Hong,Wei Hong-Bin and Song Fu-Sheng.Micro-morphology and dielectric properties for (K0.45Na0.55)NbO3 lead-free piezoelectric crystal[J].Acta Physica Sinica,2011,60(10):107704-107704. |
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| Authors: | Chen Chao Jiang Xiang-Ping Wei Wei Li Xiao-Hong Wei Hong-Bin and Song Fu-Sheng |
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| Institution: | Department of Material, Jingdezhen Ceramic Institute, Jingdezhen 333001, China;Department of Material, Jingdezhen Ceramic Institute, Jingdezhen 333001, China;Department of Material, Jingdezhen Ceramic Institute, Jingdezhen 333001, China;Department of Material, Jingdezhen Ceramic Institute, Jingdezhen 333001, China;Department of Material, Jingdezhen Ceramic Institute, Jingdezhen 333001, China;Department of Material, Jingdezhen Ceramic Institute, Jingdezhen 333001, China |
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| 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. |
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| Keywords: | (K0 45Na0 55)NbO3 crystal lead-free crystal structure dielectric property |
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