Abstract
While heating and cooling in the range 20-60° C, the pyroelectric coefficient, the dielectric permittivity and the specific heat of three samples of triglycine sulphate (TGS) family have been measured. These samples were TGS doped with alanine (ATGS), deuterated TGS doped with alanine (ADTGS), and deuterated TGS doped with alanine and bivalent platinum (ADTGS:Pt). Using these data, the thermal hysteresis of the pyroelectric figure of merit F v of these three crystals has been studied in this temperature range. The highest value of F v was obtained for the ADTGS:Pt crystal while the widest temperature range in which F v can be considered constant was obtained for the ADTGS crystal.
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