Temperature dependences of dielectric constant and spontaneous polarization in triglycine selenate were measured under hydrostatic pressure. Coefficients of power series expansion of the free energy in respect to electric polarization were calculated front the experimental data. It has been found that the coefficient ξ of the fourth power changes its sign from plus to minus near 5 kbar. This indicates that the tricritical point of triglycine selenate exists at ∼40.6°C and ∼5 kbar.
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Yamashita et al. (1980) studied this question.
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