Specific Heat of the Order-Disorder Transition inβBrass

Abstract

The specific heat $C_p$ of $\beta$ brass above and below its critical temperature $T_c=739\mathrm{}°$K has been measured over the temperature range ${10}^{-6\mathrm{}}<\epsilon <{10}^{-1\mathrm{}}$, where $\epsilon =\left|\frac{(T-T_c)}{T}\right|$. $C_V$ was then evaluated using the Pippard relations. Above $T_c$, $C_V$ is in good agreement both in magnitude and power-law dependence with Ising model calculations while below $T_c$, $C_V$ depends roughly logarithmically on $\epsilon$ for ${10}^{-5\mathrm{}}<\epsilon <{10}^{-2\mathrm{}}$.