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The present paper describes the synthesis, characterization of mixedvalence bismuthates with 3- or 2-dimensional perovskite-like structures and structural criteria that influence superconductivity in these compounds. Single phase samples of Sr1−xKxBiO3 were prepared for the broad range of K-content: 0.25≤x≤0.65. For these bismuthates the symmetry of the structure changes from monoclinic to orthorhombic...
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