Growth, crystallography and dielectric properties of Bi2WO6
- 1 August 1972
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 4 (1) , 51-55
- https://doi.org/10.1080/00150197208241519
Abstract
The compound Bi2WO6 has been prepared as a ceramic and in single crystal form. Growth of Bi2WO6 single crystals from the melt by the Czochralski method produced boules as large as 20 mm in diameter by 60 mm long. On cooling to room temperature these boules invariably cracked, yielding for experimental investigations small prismatic rods bounded by (001) and (111) faces. The cause of the cracking phenomenon was found from DTA and dielectric property measurements to be a possible phase transformation occurring at 935°C, with an energy of 1 kcal/mole. A low-energy relaxation process was also detected in the temperature region 300-450°C. The low-iemperature modification of Bi2 WO6 is ferroelectric and crystallizes with the orthorhombic crystal structure B2cb(C172v), a -5.458 Å, b = 5.438 Å and c = 15.434 Å. The structure of the higher temperature phase was not determined because of the severe recrystallization of the samples.Keywords
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