Abstract

Cell parameters (space group P6 3 mc, Z = 1) are a = 5.890(4), c = 9.255(5) angstrom and a = 5.897(2), c = 9.256(3) angstrom, respectively. Final weighted R factors were 0.039 and 0.049 for 737 and 604 reflections with F > 4sigma (F).--Modified journal abstract.

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