Orientation of phase boundaries has been studied for high-temperature phase transitions in NaNbO3 single crystals. Experimentally determined angles formed by the normal to the interface with the axes of the system associated with the initial cubic phase were ascertained to be in good agreement with calculated values based on the Roitburd theory. Confirmation was also found for the conclusion drawn from this theory, i.e. that if the specific strain of transition is not an invariant plane strain, then the twinning process accompanying this transition is its invariable characteristic.
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Dec et al. (1989) studied this question.
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