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- W2003648328 abstract "In this paper we report about the electrical properties of La0.7Ca0.3MnO3 compounds substituted by copper on the manganese site and/or deliberately contaminated by SiO2 in the reactant mixture. Several phenomena have been observed and discussed. SiO2 addition leads to the formation of an apatite-like secondary phase that affects the electrical conduction through the percolation of the charge carriers. On the other hand, depending on the relative amounts of copper and silicon, the temperature dependence of the electrical resistivity can be noticeably modified: our results enable us to compare the effects of crystallographic vacancies on the A and B sites of the perovskite with the influence of the copper ions substituted on the manganese site. The most original result occurs for the compounds with a small ratio Si/Cu, which display double-peaked resistivity vs. temperature curves." @default.
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- W2003648328 date "2004-01-01" @default.
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- W2003648328 title "Effects of silicon addition on the electrical and magnetic properties of copper-doped (La,Ca)MnO3 compounds" @default.
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- W2003648328 doi "https://doi.org/10.1016/s0304-8853(03)00548-1" @default.
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