Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10632072 | Materials Research Bulletin | 2005 | 7 Pages |
Abstract
Calcium barium niobate Ca0.28Ba0.72Nb2O6 (CBN-28) crystals were successfully grown by the Czochralski method. X-ray powder diffraction experiments indicated that CBN single crystals are tetragonal with a = 12.432(±0.002) Ã
and c = 3.957(±0.001) Ã
, which have almost the same structure as the Sr0.50Ba0.50Nb2O6 (SBN-50) crystal. The thermal expansion coefficient perpendicular to Z-direction had been measured to be 1.25 Ã 10â5 Kâ1 between 293.15 and 572.15 K, and along Z-axis was negative between 298.15 and 543.15 K. The specific heat of the crystal had been measured by the differential scanning calorimetric experiments. The transmittance spectra from 200 to 3200 nm were also measured. The measured temperature dependence of dielectric constants showed that the Curie temperature of the CBN-28 crystals is 260 °C, which is about 200 °C higher than that of the (SBN) crystal.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hualong Song, Huaijin Zhang, Xiangang Xu, Xiaobo Hu, Xiufeng Cheng, Jiyang Wang, Minhua Jiang,