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The temperature dependencies of a spontaneous polarisation, P-s, and pyroelectric modulus, gamma, at different electric field intensities were investigated for the triglycine sulphate crystals doped with the Cr3+ chromium ions. On the base of thermodynamic theory the temperature dependencies of P-s and gamma at different electric field intensities were estimated. The coefficients of the expansion of the thermodynamic potential were determined. The experimental results were compared with those obtained according to the thermodynamic theory.

Study of Spontaneous Polarisation and Pyroelectric Modulus for the Triglycine Sulphate Crystals Doped by Chromium Ions