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A high resolution ac photopyroelectric calorimeter has been used to provide qualitative information on latent heat exchange and so establish the character of phase transitions in solids. Antiferromagnetic to paramagnetic transition in CoO is shown to present a small heat exchange characteristic of a weak first order transition. Well known first and second order transitions in KFeF4 and NiO, respectively, are studied as a contrast method.

Latent heat evaluation with photopyroelectric calorimetry