New liquid-crystal method for revealing ferroelectric domains

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Abstract
It was found that a layer of the nematic liquid crystal p-N-(p-Methoxybenzylidene) amino n-butylbenzen, extended on a triglycine sulfate crystal, takes on an orientational pattern which delineates the polarized domain structures. This technique quickly delineates domain structures in great detail and can be used on a wide variety of ferroelectric crystals. It is even applicable to a uniaxial regular type in which a domain structure cannot be detected by ordinary optical methods. The new method and the ordinary carbon powder pattern technique were compared on a triglycine sulfate crystal.