Growth and properties of Ca{sub 0.28}Ba{sub 0.72}Nb{sub 2}O{sub 6} single crystals
- State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100 (China)
Calcium barium niobate Ca{sub 0.28}Ba{sub 0.72}Nb{sub 2}O{sub 6} (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) A and c = 3.957({+-}0.001) A, which have almost the same structure as the Sr{sub 0.50}Ba{sub 0.50}Nb{sub 2}O{sub 6} (SBN-50) crystal. The thermal expansion coefficient perpendicular to Z-direction had been measured to be 1.25 x 10{sup -5} K{sup -1} 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 deg. C, which is about 200 deg. C higher than that of the (SBN) crystal.
- OSTI ID:
- 20889758
- Journal Information:
- Materials Research Bulletin, Vol. 40, Issue 4; Other Information: DOI: 10.1016/j.materresbull.2005.01.005; PII: S0025-5408(05)00021-8; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Investigation about relationships between the symmetries of ferroelectric crystal Ca{sub 0.28}Ba{sub 0.72}Nb{sub 2}O{sub 6} and second-harmonic patterns
180 deg. domain structure and its evolution in Ca{sub 0.28}Ba{sub 0.72}Nb{sub 2}O{sub 6} ferroelectric single crystals of tungsten bronzes structure