Abstract
Abstract Zn3B7O13Cl: R3c, a hex = 8.53725(7) A, c hex = 20.96849(25) A. V hex = 1323.53(3) A,3 a rh = 8.5527(1) A, αrh = 59.8809(1)°, Dx = 3.8931Mg/m3, Rp = 0.081 and RB = 0.047 for 35 reflections and 44 parameters from powder profile refinement (T = 298 K); R = 0.051 for 1568 reflections and 74 parameters from single-crystal refinement (T = 298 K). A comparison with isostructural iron-chlorine boracite, Fe3B7O13Cl, suggests that the magnitude of the rhombohedral lattice shear in trigonal boracites depends in a complex manner on the bonding requirement of the five-coordinate metal ions, and the space requirement of an oxygen-boron framework that is relatively rigid with respect to changes of O—B bondlengths and O—O contact distances, but more flexible with respect to changes of bond angles and torsion angles.
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