Abstract
We correlate here the specific heat C p with the frequency shifts (1/ V) (∂ V/∂ T) p and the thermal expansivity α p with the (1/ ν) (∂ V/∂ P) T close to the I–II transition in NH 4Br. This correlation is performed for the Raman mode of ν s (140 cm −1) using the molar volume data for NH 4Br. It is shown here that spectroscopic modifications of the Pippard relations are applied satisfactorily to the I–II phase transition by using a lattice mode of NH 4Br.
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