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- W2091057188 abstract "We have prepared new perovskite manganites La0.7Ca0.3−xKxMnO3 (0⩽x⩽0.15). These compounds are shown to undergo structural transition from orthorhombic to rhombohedral phase. When increasing x, the structural properties reveal the existence of a stronger disorder, for the orthorhombic structure, which leads to an increase of the Mn–O–Mn bond angle and a decrease of the Mn–O bond length. This behaviour contributes to the increase of the one-electron bandwidth W, which results in an increase of the Curie temperature TC. For the rhombohedral structure, the disorder is suppressed, so W and TC decrease. The Raman studies at 300 K indicate that the spectra of La0.7Ca0.3−xKxMnO3 are modified when x increases. The strong x dependence of the phonon linewidth suggests that considerable lattice disorder is already present which confirms the structural transition observed by X-ray diffraction patterns." @default.
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- W2091057188 date "2007-09-01" @default.
- W2091057188 modified "2023-10-18" @default.
- W2091057188 title "Effects of substituting divalent by monovalent ion on the physical properties of La0.7Ca0.3−xKxMnO3 compounds" @default.
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- W2091057188 doi "https://doi.org/10.1016/j.jmmm.2007.03.067" @default.
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