Raman Scattering Study of Cubic–Tetragonal Phase Transition in Zr1−xCexO2 Solid Solution |
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| Authors: | Masatomo Yashima Haruo Arashi Masato Kakihana Masahiro Yoshimura |
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| Affiliation: | Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 227, Japan;Department of Machine Intelligence and Systems Engineering, Faculty of Engineering, Tohoku-University, Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980, Japan |
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| Abstract: | A structural phase transition between the cubic (space group, Fm 3 m) and tetragonal (space group, P 42 /nmc) phases in a zirconia–ceria solid solution (Zr1?xCexO2) has been observed by Raman spectroscopy. The cubic–tetragonal ( c–t" ) phase boundary in compositionally homogeneous samples exists at a composition X0 (0.8 < X0 < 0.9) at room temperature, where t " is defined as a tetragonal phase whose axial ratio c/a equals unity. The axial ratio c/a decreases with an increase of ceria concentration and becomes 1 at a composition X'0 (0.65 < X'0 < 0.7) at room temperature. The sample with a composition between X0 and X'0 is t " ZrO2. By Raman scattering measurements at high temperatures, the tetragonal ( t" ) → cubic and cubic → tetragonal phase transitions occur above 400°C in Zr0.2 Ce0.8O2 solid solution. |
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