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Experimental results by means of very precise X-ray goniometry on Pb 3P2xV2 (1-x) O8 system are given. They clearly show that there is no smearing of the order of transitions, x varying from 0 to 1, but a spreading of the critical temperature and of the rate of transformation, i.e. the volumic ratio between the high and low temperature phases. The interfaces between the two phases are described.
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Kiat et al. (1987) studied this question.
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