
Materials Research Bulletin p. 1137 - 1148 (1994)
Update date:2022-08-17
Topics:
Taoudi, A.
Laval, J. P.
Frit, B.
The three LnOF compounds (Ln = Tm, Yb, Lu) have been prepared and shown to be isostructural with the α-ZrO2, baddeleyite. The crystal structure has been refined by a Rietveld analysis of the X-ray powder pattern of the YbOF compound (space groupe P21/c, a = 5.5052(4) angstroms, b = 5.4245(4) angstroms, c = 5.5219(4) angstroms, β = 99°68, Z = 4). The strict anionic order observed (alternate 44 layers of oxide anions and 32.4.3.4 layers of fluoride anions) has been analyzed with respect to the parent fluorite structure and to other to isostructural compounds like α-ZrO2, TaON.
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