Abstract
Supercritical fluids are shown to be an excellent reaction media for the synthesis of novel solid state phases at intermediate temperatures. LiVGe 2O 6 and NaVGe 2O 6 have the common pyroxene structure composed of VO 6 linear chains. NaVGe 2O 6 crystallizes in the monoclinic space group C2/ c with four formula units having cell dimensions a = 9.960(4) Å, b = 8.853(10) Å, c = 5.4861(10) Å, β = 106.403(3)°. The structure was refined until R = 0.0290 and R w = 0.0370. For LiVGe 2O 6 in space group P2 1/ c: a = 9.8508(7) Å, b = 8.754(3) Å, c = 5.3948(13) Å, β = 108(3)°, R = 0.0240 and R w = 0.0250. The compounds contain edge-shared VO 6 octahedral chains and corner-shared GeO 4 tetrahedral chains. The presence of these VO 6 chains results in spin-Peierls distortion. Structural and physical characterization of the compounds are reported.
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