The compound Sr6V9S22O2 was prepared from SrS, sulfur, vanadium metal, and V2O5 at 950 degrees C in an evacuated quartz tube. The compound is rhombohedral, R3, with a = 8.7538(6) A, c = 34.934(3) A, and Z = 3, and shows strong preferred orientation in its XRD profiles (00l) due to the layered nature of the structure. The compound contains charged CdI2 type VS2 layers of formula [V7S14]4- separated by [Sr6(VOS3)2(S2)]4+ layers. The latter has VOS3(3-) tetrahedra and S2(2-) disulfide units linked by Sr2+ ions. Magnetic susceptibility and four-probe resistivity studies show essentially temperature-independent paramagnetism above 80 K and small gap semiconductor behavior, respectively. The compound has a positive Hall coefficient at room temperature. The relationship among Sr6V9S22O2, "SrV2S5" (J. Solid State Chem. 1996, 126, 189), and other AM2S5 phases is discussed.
The ternary Cr(III) sulfide La15.9(2)Cr5.4(2)S32 contains d3-d3 face-shared bioctahedral Cr2S9
12- dimers (d
Cr
-
Cr = 3.014(5) Å) alternately linked by two types of edge-bridged octahedral cluster units (La6S13 and La3.9Cr1.4S13) to form chains running parallel to the c-axis. Its oxidation state, structure, composition, and magnetism are discussed in terms of previous literature reports.
2000 vanadium, V vanadium, V I 5000
-022Synthesis and Magnetic and Transport Properties of Sr 6 V 9 S 22 O 2 : "AM 2 S 5 " Phases Revisited. -The title compound is prepared by solid state reaction of SrS, V 2 O 5 , V, and sulfur at 800-950 • C (evacuated quartz tube). Sr 6 V 9 S 22 O 2 crystallizes in the rhombohedral space group R3 with Z = 3. The structure contains charged CdI 2 -type layers of composition [V 7 S 14 4− ] separated by [Sr 6 (VOS 3 ) 2 (S 2 ) 4+ ] layers formed by VOS 3 tetrahedra, S 2 2− disulfide units, and Sr 2+ ions. The compound is a small gap semiconductor and exhibits essentially temp.-independent paramagnetism above 80 K. It is concluded that the Sr 6 V 9 S 22 O 2 phase is the true identity of the "Sr 2 V 3 S 7 " and "SrV 2 S 5 " phases reported previously. -(LITTEER, J. B.; CHEN, B.-H.; FETTINGER, JAMES C.; EICHHORN, B. W.; JU, H. L.; GREENE, R. L.; Inorg. Chem. 39 (2000) 3, 458-462; Dep. Chem., Univ. Md.,
structure structure (solids and liquids) D 2000
-004Synthesis, Structure, and Magnetism of La 15.9(2) Cr 5.4(2) S 32 : A Cr(III) Sulfide Containing d 3 -d 3 Cr 2 S 9 12− Bioctahedra with Large Antiferromagnetic Coupling. -The title compound is prepared from La 2 S 3 , Cr, and sulfur in the presence of a LaCl 3 flux (1050 • C, 48 h, sealed silica tube). Powder XRD results reveal a rhombohedral structure, space group R3m with Z = 6. It contains a d 3 -d 3 face-shared Cr 2 S 9 12− bioctahedra alternately linked by two types of edge-bridged octahedral cluster units to form chains running parallel to the c-axis. The magnetic properties are discussed. -(LITTEER, J. BRIAN; SIRCHIO, SCOTT A.; FETTINGER, JAMES C.; SMOLYANINOVA, VERA; EICHHORN, BRYAN W.; GREENE, RICHARD L.; Chem. Mater. 11 (1999Mater. 11 ( ) 5, 1179Mater. 11 ( -1182 Dep. Chem., Univ. Md.,
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