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Growth, dielectric, ferroelectric and optical properties of Ca0.28Ba0.72Nb2O6 single crystals |
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| Authors: | Hualong Song Huaijin Zhang Quanzhong Jiang Xiangang Xu Chaojing Lu Xiaobo Hu Jiyang Wang Minhua Jiang |
| Institution: | aInstitute of Crystal Materials and National Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China bPhysics Department, University of Warwick, Coventry CV4 7AL, UK cDepartment of Physics, Hubei University, Wuhan 430062, PR China |
| Abstract: | Calcium barium niobate Ca0.28Ba0.72Nb2O6 (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. |
| Keywords: | A2 Czochralski method B1 Tungsten bronzes B2 Ferroelctric materials |
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