Phase relations of the Cr 2O 3TiO 2 system
Abstract
The phase relations of the system Cr 2O 3TiO 2 were determined at temperatures between 1400 and 1765°C in air. Discrete homologous series of Cr 2Ti n-2 O 2 n-1 , with n = 6, 7, 8, were found to be stable as single phases in the range of certain temperatures, while a continuous solid solution existed in the composition of n > 8 below 1425°C. This presence and its stable region of a new compound of Cr 2TiO 5 corresponding to n = 3 are revealed in the present paper. Cr 2Ti 2O 7, the so-called E phase, existed in wide homogeneity range, corresponding to the composition of approximately 3 < n < 5. High-temperature phases (called n and n' phases in the present work) existed above 1425°C and seemed to be closely related to each other from the viewpoint of the structure except that some X-ray diffraction lines of n phase were strongly diffused. Both rutile and chromia had limited solid solubilities. In the present paper, phase relations between Cr 2O 3 and TiO 2 are summarized in a phase diagram.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- July 1978
- DOI:
- 10.1016/0022-4596(78)90112-3
- Bibcode:
- 1978JSSCh..25..273S