Some thermodynamic aspects of the high-temperature transition in doped V2O3 |
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| Authors: | G. M. Joshi H. V. Keer J. M. Honig |
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| Affiliation: | (1) Department of Chemistry, Purdue University, West Lafayette, 47907 Indiana, USA;(2) Present address: Department of Chemistry, Indian Institute of Technology, 400076 Bombay, India |
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| Abstract: | Measurements of the entropy change are reported for the high-temperature metal-insulator (MI) transitions in the (V1–xCrx)2O3 and (V1–xAlx)2O3 systems. It is emphasized that the entropy of the I phase exceeds that of the M phase. Evidence is presented to show that the M and I phases coexist over a narrow temperature range. The transformation is attended by enormous hysteresis effects; these indicate that the lattice plays an important role in the transition. The probable role of Cr3+ and Al3+ as a dopant in the V2O3 lattice is briefly discussed. A phase diagram for the dilute V2O3-Al2O3 alloy system is presented. |
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| Keywords: | entropies of transition in V2O3 alloys metal-insulator transitionin V2O3 alloys V2O3-Cr2O3 and V2O3-Al2O3 alloys phase diagram for V2O3-Al2O3alloys |
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