Published: 1962
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The low-temperature heat capacity behavior of PuO/sub 2/ was found to be anomalous and irreproducible, changing slightly after every one of seven liquid helium coolings. Data obtained from a second series of liquid helium coolings, made after refiring three of four original FuO/sub 2/ wafers in air, were consistent with the last run of the first series. The final low-temperature heat capacity vs temperature curve was more like that reported for ThO/sub 2/ than it was for similar curves reported for UO/sub 2/ and NpO/sub 2/. A least squares equation relating heat capacity and temperature is given for the low-temperature region. Values of heat capacity, entropy, and enthalpy are listed for several temperatures. (auth).
