Phase Separation in Solid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Mixtures, as Shown by Specific Heat Measurements

Specific heat measurements in the range 0.05 to 1 deg K are presented for solid He/sup 3/--He/sup 4/ mixtures over a range of concentrations to 80% He/ sup 4/. The specific heat (C/R) is graphed versus temperature (T) for a number of values of the atomic fraction (X/sub 0/) of He/sup 3/. Also the phase separation line is plorted as T versus X/sub 0/ using a single adjustable parameter determined by fitting the specific-heat data to the theory. The results show that solid helium mixtures split into two nearly pure phases of He/ sup 3/ and He/sup 4/ near O deg K. (H.D.R.)

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