Optical and X-ray distinction of ferroelectric non-ferroelastic domains

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Abstract
We show that there exist 17 possible relations (twin laws) between structures of two ferroelectric non-ferroelastic domains. For each twin law we indicate whether X-ray diffraction intensities from two domains equal or differ and give number of optical tensor components that can distinguish both domains. We list twin laws which appear in particular ferroelectric non-ferroelastic or partially ferroelastic phases.