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Crystal structural parameters of RBa 2 Cu 3 O 7 (R1237, R = rare earth elements except, Ce, Pm, and Tb) have been inducted and analyzed as the functions of the effective ionic radius of R 3+ ions by a feasible method of structural correlation. For some parameters indirectly related to O(2,3) atoms, Pr1237 is not shown to be markedly unusual, suggesting a trivalent...
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