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Structure and dielectric response in barium substituted manganites Ba 0.2 Bi 1.8 Mn 4 O 10 were investigated. The structural refinements showed that Mn 3+ and Mn 4+ occupy the pyramidal sites and the octahedral sites, respectively. The barium substitution has no distinct effect on the Mn 4+ –O distance, but significantly increases the Mn ...
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