Darstellung,Eigenschaften und Phasenbeziehungen von Ru3Sn15O14

Preparation, Properties, and Phase Relations of Ru₃Sn₁₅O₁₄ Coexistence relations in the system Ru/Sn/O have been investigated by X‐ray measurements of powder mixtures annealed in the region of 1173–1273 K. Thermodynamic data of Ru₂Sn₃, Ru₃Sn₇, and Ru₃Sn₁₅O₁₄ were obtained by EMF measurements. Phase diagrams calculated with these data are in good agreement with experimental results. Only one phase, Ru₃Sn₁₅O₁₄, exists in the ternary system between 973 and 1273 K. Red translucend single crystals were obtained from a tin melt. Polycrystalline powder was prepared by solid state reaction of a mixture of Ru₃Sn₇, SnO₂, and Sn with molar ratio 1:7:1 at 1173 K. Ru₃Sn₁₅O₁₄ is a p‐type semiconductor, E_A = 0.50(5) eV, as conductivity and thermopower measurements show. Mössbauer investigations confirm the existence of three different tin surroundings.