期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 38, 期 11, 页码 3925-3931出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.04.002
关键词
Phase trasformations; Yttrium tantalate; Zirconia; Raman spectroscopy; X-ray diffraction
资金
- Office of Naval Research [N00014-15-1-2715]
Amorphous yttrium tantalate, as well as solid solutions containing zirconia, transform on heating to a monoclinic-prime phase and then, with further heating, to a crystalline tetragonal (T) solid solution phase at 1450 degrees C. On subsequent cooling the tetragonal phase converts by a second-order displacive transformation to a different monoclinic phase not to the monoclinic-prime phase. On subsequent reheating and cooling, the phase transformation occurs between the monoclinic (M) and tetragonal phases, and the monoclinic-prime phase cannot be recovered. The limit of zirconia solubility in both the monoclinic-prime and monoclinic phases lies between 25 and 28 m/o ZrO2, consistent with previous first-principles calculations. The monoclinic-prime phase is stable up to at least 1400 degrees C for 100 h for zirconia concentrations from 0 to 60 m/o ZrO2. This temperature exceeds the temperature of the equilibrium M-T phase transformation suggesting that the monoclinic-prime phase transforms directly to the tetragonal phase by a reconstructive transformation and is unaffected by the zirconia in solid solution.
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