Growth, dielectric, ferroelectric and optical properties of Ca_0.28Ba_0.72Nb₂O₆ single crystals

详细信息    查看全文

• 作者：Hualong Song ; Huaijin Zhang ; Quanzhong Jiang ; Xiangang Xu ; Chaojing Lu ; Xiaobo Hu ; Jiyang Wang and Minhua Jiang
• 关键词：A2. Czochralski method ; B1. Tungsten bronzes ; B2. Ferroelctric materials
• 刊名：Journal of Crystal Growth
• 出版年：2006
• 出版时间：1 May 2006
• 年：2006
• 卷：290
• 期：2
• 页码：431-435
• 全文大小：250 K

文摘

Calcium barium niobate Ca_0.28Ba_0.72Nb₂O₆ (CBN-28) crystals were grown by the Czochralski method. The effective segregation coefficients of Ca, Ba, Na elements in CBN-28 crystal growth were measured, and the rocking curve from 0 0 2 reflection of CBN-28 wafer was also measured by the high-resolution X-ray diffractometer D5005, and the full-width at half-maximum value was measured to be 70.6″. The measured dependence of dielectric constants on temperature showed the Curie temperature of the CBN-28 crystals is between 246.8 and 260 °C. Typical polarization–electric field (P–E) hysteresis loops were measured at room temperature. Ferroelectric 180° domains were observed by scanning electron microscopy (SEM) on the etched (0 0 1) surface of the CBN-28 crystals. The transmittance of [0 0 1]-oriented CBN-28 crystals was measured and the result shows that optical properties of CBN-28 crystal are almost the same as those of SBN for wavelengths between 2500 and 7500 nm.