Crystal structure and electrical properties of the mixed valent titanium oxysulfide Sm2Ti2S2O4.5 |
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Authors: | C Guillot-Deudon V Meignen L Cario A Lafond A Meerschaut |
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Affiliation: | Department of Chemistry, Laboratoire de Chimie des Solides, 2 rue de la Houssinière, BP 32229 44322 Nantes cedex 03, France |
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Abstract: | A new phase Sm2Ti2S2O4.5 was synthesized and its crystal structure was solved by single-crystal X-ray diffraction. This compound crystallizes in the monoclinic system (C2/m) with lattice constants a=17.9987(11) Å, b=3.71607(14) Å, c=12.6172(8) Å and β=133.645(4)°. The structure is built up from double chains of Ti-centered octahedra between which Sm-polyhedra develop. In spite of very close formulations, the structure of Sm2Ti2S2O4.5 differs completely from that of the defect Ruddelsden-Popper phase Sm2Ti2S2O5 previously reported. The title compound presents a mixed valence for titanium with Ti(III) (d1) and Ti(IV) (d0) located in different crystallographic sites. However, conductivity measurements show that this compound is non-metallic. |
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Keywords: | Mixed valence Titanium Oxysulfide Rare earth Crystal structure |
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