Ba4In2−x(CO3)1+xO6−2.5x and Ba4In0.8Cu1.6(CO3)0.6O6.2—new indium oxycarbonates closely related to n=3 Ruddlesden–Popper phases |
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Authors: | A. Baszczuk M. Wocyrz A. Zygmunt |
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Affiliation: | W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950, Wrocaw 2, Poland |
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Abstract: | Investigations of phase relations in the Ba-rich part of the In2O3–BaO(CO2)–CuO pseudo-ternary system at 900 °C have revealed the existence of new indium–copper oxycarbonate – Ba4In0.8Cu1.6(CO3)0.6O6.2. Rietveld refinement of the X-ray powder diffraction data combined with infrared studies gives evidence that this phase is a oxycarbonate crystallising in the tetragonal structure (space group I4/mmm) with unit cell parameters: a=4.0349(1) Å and c=29.8408(15) Å. In the binary part of the In2O3–BaO(CO2) system we have identified the occurrence of Ba4In2−x(CO3)1+xO6−2.5x oxycarbonate solid solution showing a crystal structure also described by I4/mmm space group, but with the unit cell parameters: a=4.1669(1) Å and c=29.3841(11) Å for x=1. The existence range of this phase, −0.153<x<0.4, includes chemical compositions of earlier found phases: Ba5In2+xO8+0.5x with 0≤x≤0.45 (known as the -solid solution), as well as the binary Ba4In2O7 phase. The crystal structures of both new oxycarbonates are isomorphic and related to n=3 member of the Ruddlesden–Popper family. |
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Keywords: | Oxide materials Crystal structure Optical spectroscopy X-ray diffraction |
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