The rutile structure of Al_1-x·□_xO_1-3xF_{1 + 3x},x= 0.086

Abstract

A1(0, F)2 crystallizes as a high temperature reaction product of fine granined Al-oxides and a PbF2-melt. The space group is that of rutile (TiOz), PAi/mnm with unit cell dimensions a = 4.627 Ä, c = 3.005 Ä and Z = 2. The structure refinement based on 64 independent reflections and full-matrix least-squares method yielded R = 0.0195 {R,, = 0.0102). The Alanion distances are 1.982(1) Ä (equatorial) and 1.980(1) Ä (apical), where the distortion of the anion-octahedron is reflected by the three different anion-anion-distances 2.579(2) A (common edge), 2.802(2) Ä, 3.005(2) Ä and the equitorial angles (0,F)-A1-(0,F) within the octahedron are 81.3° and 98.7° respectively.

Structure and Properties of Noncrystalline Aluminum Oxide-Hydroxide Fluorides

“…In literature, two crystalline aluminum oxide fluorides with different crystal structures are known. In 1992, Kutoglu described the rutile structure of tetragonal AlFO, which was obtained as an unexpected byproduct in the synthesis of complex oxides in PbF-melts . Recently, Vasiliev et al reported on orthorhombic AlFO, also obtained as an unexpected byproduct in the SrAlF 5 synthesis .…”