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- W2950992706 abstract "Abstract Two series of perovskite-type compounds La1−xCaxTiO3 (x=0.2–1.0) and La2(1−x)/3CaxTiO3 (x=0, 0.1, 0.4 and 0.8) were synthesized by a ceramic technique in air (final heating 1350 °C). The crystal structures of the La1−xCaxTiO3 compounds were characterised at room temperature as orthorhombic in space group Pbnm (samples with 0.7≤x≤1) and as rhombohedral in space group R 3 c (x=0.6 sample). At room temperature three different perovskite-like structures has been found for A-deficient La2(1−x)/3CaxTiO3 compound: orthorhombic Pbnm structure for the composition with x=0.8, orthorhombic Imma structure for x=0.4, and monoclinic P2/m (or possibly orthorhombic Cm2m) structure for x=0.1. The compositions were stable within the pO2 range 21000 to 6·10−16 Pa at 850–1000 °C. Oxygen stoichiometries and electrical conductivities of the solid solutions were investigated. At 900 °C within the oxygen partial pressure region 1·10−15 to 0.21·105 Pa the compounds are n-type semiconductors. For La0.1Ca0.9O3 maximal conductivities were observed at 1000 °C of about 50 S/cm in Ar/H2/H2O (pH2O/pH2=0.01) and of 0.003 S/cm in air. No simple correlations between catalytic activity, electrical conductivity, and crystal structure parameters were found." @default.
- W2950992706 created "2019-06-27" @default.
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- W2950992706 date "2003-07-29" @default.
- W2950992706 modified "2023-09-27" @default.
- W2950992706 title "Lanthanum Doped Calcium Titanates: Synthesis, Crystal Structure, Thermal Expansion and Transport Properties." @default.
- W2950992706 cites W2004947401 @default.
- W2950992706 doi "https://doi.org/10.1002/chin.200330005" @default.
- W2950992706 hasPublicationYear "2003" @default.
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