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HIGH-TEMPERATURE HEAT CONTENTS AND ENTROPIES OF THE SESQUIOXIDES OF ERBIUM, HOLMIUM, THULIUM, AND YTTERBIUM
The heat contents of the sesquioxides of Er, Ho, Tm, and Yb (Er/sub 2/O/ sub 3/, Ho/sub 2/O/sub 3/, Tm/sub 2/O/sub 3/, and Yb/sub 2/O/sub 3/) in the cubic crystalline form were measured at 298 to 1,800 deg K. The Er and Ho sesquioxides gave regular heat content-temperature curves. Tm/sub 2/O/sub 3/ sesquioxide had a minor thermal anomaly near 1,680 deg K, with a heat absorption of 310 cal/mole; similarly, Yb/sub 2/O/sub 3/ had a minor anomaly near 1,365 deg K, with a heat absorption of 150 cal/mole. The heat content results are presented in both tabular form (at 100 deg intervals) and in algebraic form. Entropy increments, corresponding to the tabulated heat content results, also are listed. (auth