J. Phys. C: Solid State Phys. 19, 2137-2151 (1987).

Photoacoustic investigation of phase transitions in solids

Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.

(Received 30 May 1985; in final form 15 August 1985)

The use of the photoacoustic effect in the investigation of first-and second-order phase transitions has been examined. Changes in the amplitude of the photoacoustic signal across the phase transition are compared with changes in thermal properties such as specific heat and thermal diffusivity. The systems studied include NaNO₂, TlNO₃, CsNO₃, NH₄NO₃, BaTiO₃, CoO, Cu₂HgI₄, VO₂ and V₃O₅. The current photoacoustic studies are discussed in the light of the theoretical models available.

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