Synthesis and characterization of the new rare-earth/transition-metal oxysulfides La{sub 6}Ti{sub 2}S{sub 8}O{sub 5} and La{sub 4}Ti{sub 3}S{sub 4}O{sub 8}

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1995.1062· OSTI ID:518220

Cody, J A; Ibers, J A ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

The new compounds La{sub 6}Ti{sub 2}S{sub 8}O{sub 5} and La{sub 4}Ti{sub 3}S{sub 4}O{sub 8} have been prepared from the reaction of La{sub 2}S{sub 3} with TiO{sub 2}. Both phases are highly resistive and weakly paramagnetic. Single-crystal X-ray diffraction measurements show that La{sub 6}Ti{sub 2}S{sub 8}O{sub 5} crystallizes in space group C{sub 2h}{sup 2}-P2{sub 1}/m of the monoclinic system with two formula units in a cell of dimensions a = 12.572(10), b = 4.053(2), c = 16.289(14) {angstrom}, {beta} = 96.79(1){degrees} (T = 113 K). The structure contains six crystallographically independent La atoms with four different coordination geometries, and Ti atoms in octahedral coordination. The Ti octahedra form an infinite, corner-sharing dimeric chain in the b direction. La{sub 4}Ti{sub 3}S{sub 4}O{sub 8} crystallizes in the monoclinic space group C{sub 2h}{sup 3}-C2/m with four formula units in a cell with dimension a = 18.363(9), b = 3.886(2), c = 17.911(9) {angstrom}, {beta} = 109.83(2){degrees} (T= 113 K). The structure is composed of La atoms in tricapped trigonal prisms and Ti atoms in octahedra and highly distorted tetrahedra. There are four distinct linkages between these octahedra that include edge- and corner-shared O and S atoms.

• OSTI ID: 518220
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 114; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
LANTHANUM OXIDES
PARAMAGNETISM
SULFUR OXIDES
SYNTHESIS
TITANIUM OXIDES
X-RAY DIFFRACTION