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キーワード:
-
要旨:
Yellow single crystals of the isotypic phases Ca-51[WN4](12)N8O3 and
Sr-51[WN4](12)N8O3 (triclinic, P (1) over bar (#2); a =
1056.4(3)/1113.1(5) pm, b = 1239.7(3)/1304.4(5) pm, c = 1598.2(3) /
1679.4(9) pm, alpha = 102.78(1)/102.47(2)degrees, beta =
95.15(1)/95.43(3)degrees, gamma = 109.89(1)/109.77(2)degrees; Z = 1)
were grown in a Tl-flux (Ca:Tl, molar ratio 5:1, W-crucible; T-max 1273K
reaction with N-2, 1 atm, 36 h) or from pellets (Sr2N + W, molar ratio
6:1; T-max 1023K; reaction with N-2, 1 atm, 36 h). The crystal
structures contain tetrahedral anions [WN4](6-) in addition to isolated
nitride and isolated oxide ions, which are octahedrally coordinated by
Ca and Sr, respectively.
