Hydrostatic Pressure Effect on the Phase Transition of K2Mn2(SO4)3

Hydrostatic pressure effect up to 7.6 kbar on the phase transition of K₂Mn₂(SO₄)₃ was studied by measurements of the dielectric constant \varepsilon₁₁. The transition temperature linearly rises with increasing pressure with a rate 6.86°C/kbar. The latent heat and the transition entropy are calculated to be 456 cal/mol and 2.40 cal/mol\cdotdeg, respectively, by Clausius-Clapeyron’s equation.