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Two low frequency internal friction peaks, one induced by oxygen jumping in the Cu(l)-O basal planes in the orthorhombic phase and the orther in the tetragonal phase, were systematically studied. The order of orthorhombic-tetragonal phase transition was analysed based upon the internal friction data. It was inferred that the transition, generally considered as second order, may actually be first order, at least near 200℃.
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