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First principles calculation reveals that the temperature-dependent heat capacities of Ir and four Ir 3 X (X = Ti, Nb, Zr, and Hf) phases at a certain temperature are very close to each other due to their similar densities of states of phonons, and for each phase, the difference between C P and C V is also very small. In addition, it is found that for Ir/Ir 3 X superalloys,...
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