Refinement of the structure of trilanthanum trichlorohexaoxotungstate, La3WO6Cl3, from neutron powder diffraction data

Msub(r)=802.9, P63/m, a=9.4092(2), c=5.4276(2) A, V=416.15(2) A3, Z=2, high resolution neutron powder diffraction data (lambda=1.5416(3) A, T=295 K), collected from 10 to 1220 in 2theta with a 0.050 step size; final weighted profile R=9.16% was compared to an expected Rsub(E)=7.41% (conventional R based on integrated intensities = 6.00%). The refinement confirms the unusual trigonal prismatic coordination found for the WO6 group in the X-ray study [Brixner, Chen and Foris (1982). J. Solid State Chem. 44, 99-107]. The W-O and La-Cl bond lengths determined in this study are slightly shorter, by 0.006(2)-0.014(4) A, than those found in the X-ray determination. (Auth.)