Abstract
Ferroelectric domain patterms of guanidine aluminum sulfate hexahydrate (GASH) were examined by a pyroelectric probe technique, in which the laser beam scanning and data storing were controlled by a microcomputer. It was confirmed that the averaged polarity and the magnitude of pyroelectric signal on the (0001) growth region are equal to those of either (10\bar10) or (01\bar10) growth regions, which are connected by 3-fold inversion symmetry of the crystal. The standard deviation of the pyroelectric signal intensity spectrum in the (0001) region is larger than that in the other regions. The spatial fluctuation of the pyroelectric constant in the (0001) region is larger than 25 µm, which is consistent with the inhomogeneous distribution of the polar region on the spiral patterns revealed by the powder deposition technique.
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