Photothermal techniques allow, under particular experimental conditions, the simultaneous determination of specific heat, thermal conductivity, and thermal diffusivity. A comparison has been made between measurements performed with the gas-microphone (P) configuration and the photopyroelectric (PPE) one at a liquid-crystal second-order phase transition. An increase in the sensitivity with respect to thermal parameter variation has been observed in the case of PPE.
A photopyroelectric technique has been used to simultaneously measure the critical behavior of specific heat, thermal conductivity, and thermal diffusivity of Cr203 at the antiferromagneticparamagnetic phase transition. An Ising-1ike behavior has been found for~t, "~3 X10 with a=0. 10+0.02 and A/2'=0. 48+0.03. A possible crossover between Ising and Heisenberg behaviors has been found if~t, "~i s increased. Thermal diffusivity data have been fitted according to the model for uniaxial antiferromagnet with energy conservation for~t, "~3 X 10 with a critical exponent b = -0. 11+0. 02. A correction term similar to the static correction to scaling factor has been introduced in the fitting function. No anomaly has been found in thermal conductivity.
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