Abstract
Powder X-ray diffractometry and 155Gd-Mössbauer spectroscopy have been applied to Ce1 − y Gd y O2 − y/2 (0 ≤ y ≤ 1.0) prepared at 1,450°C. The former shows that this system forms a complete solid solution being the disordered defect-fluorite type in the 0 ≤ y ≤ 0.3 range and the ordered C-type in the 0.3 <y ≤ 1.0 range. Its marked positive non-Vegardianity was consistently interpreted as a generalized Vegard-law behaviour of this distortion-dilated solid solution having Gd3 + —oxygen vacancy associative nature. The latter also clarifies that in the ordered C-type phase with decreasing y the 8b-site 155Gd-Mössbauer intensity steadily diminishes and vanishes at y ~ 0.50, indicating that the more distorted minor 8b Gd3 + in C-type GdO1.5 is being preferentially replaced with Ce4 + .
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Nakamura, A., Imai, K., Igawa, N. et al. 155Gd Mössbauer spectroscopic and powder X-ray diffraction study of CeO2–GdO1.5 solid solution. Hyperfine Interact 207, 67–71 (2012). https://doi.org/10.1007/s10751-011-0419-0
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DOI: https://doi.org/10.1007/s10751-011-0419-0