Abstract
The new compound La8Ti10S24O4has been prepared from a mixture of La2Ti2O7and La2O3(in a 5:1 ratio) heated at 1200°C under a H2S gas flow. This new quaternary phase was obtained due to an incomplete sulfidizing process. Single-crystal X-ray diffraction studies show that La8Ti10S24O4crystallizes in space groupP4/mmm, withZ=1, in a cell of dimensionsa=b=10.421 Å andc=8.384 Å. Least-squares refinement converged to values ofR=0.045 andRw=0.048. The structure can be viewed as a stacking of two types of layers along the c→ axis. These layers are built up from infinite rutile-like chains (Ti octahedra) that cross perpendicularly. La atoms, in a tricapped prismatic coordination, are located in tunnels that develop parallel to the c→ direction.
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