Spontaneous Polarization of Guanidine Aluminum Sulfate Hexahydrate at Low Temperatures

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Abstract
Pyroelectric currents produced by light flashes have been observed and measured in single crystals of guanidine aluminum sulfate hexahydrate from room temperature down to -180°C. At room temperature the currents are about one-tenth of those produced in equivalent barium titanate crystals, the difference being due mainly to the lower value of the pyroelectric coefficient. Since the pyroelectric current is a smooth function of the temperature over the range studied, it is concluded that the spontaneous polarization and the specific heat also are smooth functions of temperature over the same range. There is no evidence of any phase transition or Curie point.

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