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Support of polaronic states and charge carrier concentrations of YBaCuO ceramics by oxygen and MnO impurity.
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The influence of oxygen and MnO impurity addition intervals 0.01 ≤ x ≤ 0.30 on the basic electrical conductivity, stabilization, crystallinity quality, grain boundary couplings, structural, orbital hybridization mechanisms, and superconducting properties of YBaCuOMn ceramics has extensively been analyzed by electrical resistivity, X-ray diffraction investigations, and related theoretical results.
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Department of Chemistry , Durham University, South Road , Durham DH1 3LE , United Kingdom.
Materials with the apatite structure have a range of important applications in which their function is influenced by details of their local structure. Here, we describe an average and local structural study to probe the origins of high-temperature oxide ion mobility in La(GeO)O and LaBi(GeO)O oxygen-excess materials, using the low-conductivity interstitial oxide-free LaSr(GeO)O as a benchmark. For La and LaBi, we locate the interstitial oxygen, O, responsible for conductivity by Rietveld refinement and relate the 6/ to 1̅ phase transitions on cooling to oxygen ordering.
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