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The temperature dependencies of a spontaneous polarisation, Ps, and pyroelectric modulus, y, at different electric field intensities were investigated for the triglycine sulphate crystals doped with the CPI -chromium ions. On the base of thermodynamic theory the temperature dependencies of PS and y 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.

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