Domain structure of the ferroelastic lead orthoarsenate

Abstract
The ferroelastic domain structure, observed in single crystals of lead orthoarsenate Pb3(AsO4)2 are interpreted on the basis of the mechanical twinning theory by pseudosymmetry elements. Obtained results are compared with the ferroelastic domain structure peculiarities of the Pb3(PO4)2 and Pb3(VO4)2 ferroelastic crystals.