Preparation and crystal structure analysis of magnetoplumbite-type BaGa12O19

摘要

Single-crystal X-ray analysis has verified preparation of an ideal magnetoplumbite-type phase in the ternary barium hexagallate system. X-ray refinement was carried out by the full-matrix least-squares on F-2 method, to give R-1 = 4.61% and wR(2) = 7.76% for 54 parameters and 374 independent reflections with I>2 sigma(I). Microanalysis data yields a composition of Ba1.07Ga11.95O19. The crystal chemistries of the barium hexagallate and barium hexaaluminate systems are compared and discussed. Crystal data for BaGa12O19: M=1277.98, space group P63/mmc (No. 194), a=5.8140(8) Angstrom, c=23.038(5) Angstrom, V=674.4(2) Angstrom(3), Z=2, D-c=6.293 g cm(-3), MoK alpha, lambda=0.71073 Angstrom, mu=26.532 mm(-1), 2 theta(max)=56.74 degrees. (C) 1998 Academic Press. [References: 22]