![]() A high-temperature investigation of the order-disorder phase transition of a Cu31 at.% Au alloy has revealed an intermediate periodic antiphase condition. Progress in the study of phase transitions in beta -quenched Zr-Nb alloys aged below the eutectoid temperature is reported. Crystal structures of several unreported transition-metal fluorides, rare-earth hydrides and nitrides were determined. The Cd pressures of alpha - and beta - Zr alloys containing 1 to 11% Cd were measured between 10 deg K. In the Zr-rich portion of the Zr-Ga phase diagram, the alpha / beta phase boundaries of Zr are depressed by additions of Ga and more » the beta phase decomposes by a eutectoid reaction. The specific heat of the group IV-A metals and alloys of Zr-In and Zr-Sn were measured from 1.2 to 4.5 deg K. An apparent phase transformation was detected in high- purity Ga deformed at 4.2 deg K. ighpurity Nb deformed by impact or slow compression at - 196 deg C. It is possible that materials such as these could be implemented near nuclear facilities to getter I 2(g) in the event of a nuclear accident. These results show that some metals can have extensive reactions more » with I 2(g) without showing metal-iodide preferences over metal-oxide formation based on thermodynamic predictions. In some cases, the metal-iodide complex was not stable at the experimental temperature and it was clear some volatility had occurred during the experiment based on discoloration in the vials. ![]() Silver mordenite (AgZ) was used as a standard during these studies and showed a consistent mass gain (m% I) of 10.6 → 12.8% over this temperature range. ![]() ![]() Over these temperatures, some of the metals showed increased mass gain with higher temperatures (i.e., In, Ag, Cu), Sn showed decreased iodine capture at increased temperatures, and most metals (i.e., Mo, Nb, Ni, Pd, Pt, and Ta) showed little to no mass gain at all temperatures. In this work, I 2(g) reactions with 11 metal wires (i.e., Al, Ag, Cu, In, Mo, Nb, Ni, Pd, Pt, Sn, Ta) were evaluated at three temperatures (i.e., 100 ± 3☌, 123 ± 4☌, 139 ± 5☌) with exposure times of 24 hours at each temperature. ![]()
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