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Lead Phosphate Pb3(P04)2 undergoes a transition at T c = 180.5°C from a low-temperature monoclinic phase (phase α belonging to the monoclinic space group C2h 6) to a high-temperature rhombohedral phase (phase β, D5d 3).1,2 The monoclinic phase is ferroelastic and three kinds of ferroelastic domains (or twins) have been previously observed by Brixner.2
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Chabin et al. (1976) studied this question.
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