摘要
采用激光快速凝固法制备织构化(b轴择优取向)的二钛酸钡(BaTi2O5)铁电陶瓷,使用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析晶相构成及显微组织,利用精密阻抗分析仪测试介电性能。结果表明,激光快速凝固制备BaTi2O5为高纯单斜相,具有较高致密度(相对密度大于95.1%)和择优取向度(0.34-0.48),其居里相变温度(Tc)约为443℃,居里温度点的最大介电常数(εmax)约为6000(100 kHz),居里外斯温度(T0)为410℃,居里外斯常数(C)为2.08×105K。
Textured poly-crystalline barium dititanate(BaTi2O5,denote as BT2) ferroelectric ceramics with a preferred b-axis orientation are synthesized by a novelty method named laser rapid solidification.So-synthesized BT2 is with a higher density(relative density is larger than 95.1%).The analysis of X-Ray diffraction(XRD) reveals that the samples are of high pure monoclinic phase and the grains grow along the b-axis direction with a reliability high Lotgering factor(0.34~0.48).The observation of scanning electron microscopy(SEM) shows that the so-synthesized ceramics are composed of plate-like microstructure parallel to the laser incident direction.The Curie temperature(Tc) is about 443 ℃.The maximum dielectric constant(εmax,at Tc) is about 6000 at the frequency of 100 kHz.The Curie-Weiss temperature T0 and Curie-Weiss constant are 410 ℃ and 2.08×105 K,respectively.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2011年第6期173-176,共4页
Chinese Journal of Lasers
基金
国家自然科学基金(51072238)
河南省教育厅自然科学研究计划(2011B140022)资助课题
关键词
激光技术
激光快速凝固
织构
介电性能
laser technique
laser rapid solidification
texture
dielectric property