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Abstract
A broken Williams Domain or square texture has been observed when low frequency a.c. electric and d.c. magnetic fields are applied to OOCP (di-1′,4“-octyloxybenzylidene-l,4-diaminochlorobenzene). This texture has been observed by Berman and Gelerinter in Eastman dynamic scattering mixture II. X-ray studies by de Vries indicate the presence of some smectic ordering in some alkoxybenzylidene-1,4-diaminochlorobenzenes, especially OOCP. The conditions required for the occurrence of the square texture are presented in detail and compared with those obtained by Berman and Gelerinter in KII. Experimental variables include sample temperature and thickness, magnetic and electric field intensities and frequency of the applied electric field. Agreement of the observations with those predicted for Williams Domains is presented and compared with similar observations on compounds having nematic and smectic phases. Agreement of the texture periodicity variation versus magnetic field with that predicted by Pikin and Shtol'berg is also reported.