Study of Phase Transitions in WO3 with a High-Temperature X-Ray Diffractometer
- 1 November 1957
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 28 (11), 1272-1275
- https://doi.org/10.1063/1.1722631
Abstract
WO3 undergoes a phase transformation from monoclinic to orthorhombic at approximately 320°C and from orthorhombic to tetragonal at 720°C. A detailed study of the variation of the unit cell dimensions over the range from room temperature to 1000°C has been carried out using high‐temperature x‐ray diffraction techniques. Some unique features of the apparatus are described in this paper. Between the 320°C and 720°C transformations, the a and c axes increase uniformly in length while the b axis decreases. There is a marked increase in the volume of the unit cell below the orthorhombic to tetragonal transformation; the volume decreases sharply in the transformation and resumes its ``normal'' increase above 720°C.Keywords
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