GdLiCl4, an inverse chloroscheelite
Description
Various synthetic routes (GdCl3 + Li; GdCl3 + LiCl; thermal decomposition of (NH4)2LiGdCl6) lead to the first inverse chloroscheelite GdLiCl4 [tetragonal, I41/a, a = 645.77(7), c = 1316.0(2) pm, Guinier data, route 3] with the shortest c/a ratio (2.037) known so far for scheelites. The crystal structure has been refined from single crystal data (R = 0.073, R/sub w/ = 0.040) and is derived from the CaF2 type structure by successive compression (THETA = 54.730 → THETA = 63.600) and rotation (phi = 450 → phi = 31.120) of the [LiCl4] tetrahedron with d(Li-Cl) = 237.7(2) pm. The successive steps were followed by calculations of the Madelung Part of Lattice Energy, MAPLE. A comparison with other known haloscheelites (TlTlCl4, KTlCl4, YbLiF4) is undertaken. The compression angle THETA may be taken as a measure for the distortion of the [LiCl4] tetrahedron ('tetrahedricity'). (author)
Additional details
Additional titles
- Original title (German)
- GdLiCl
Publishing Information
- Journal Title
- Z. Anorg. Allg. Chem.
- Journal Volume
- 511
- Series
- Z. Anorg. Allg. Chem.
- Journal Page Range
- 193-200
- ISSN
- 0044-2313
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- German Democratic Republic
- INIS RN
- 15058226
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- BOND ANGLE; CHEMICAL PREPARATION; EXPERIMENTAL DATA; GADOLINIUM CHLORIDES; INTERATOMIC DISTANCES; LATTICE PARAMETERS; LITHIUM CHLORIDES; MONOCRYSTALS; SPACE GROUPS; STRUCTURAL CHEMICAL ANALYSIS; TETRAGONAL LATTICES; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALI METAL COMPOUNDS; CHLORIDES; CHLORINE COMPOUNDS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CRYSTALS; DATA; DIFFRACTION; DISTANCE; GADOLINIUM COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; INFORMATION; LITHIUM COMPOUNDS; LITHIUM HALIDES; NUMERICAL DATA; RARE EARTH COMPOUNDS; SCATTERING; SYMMETRY GROUPS; SYNTHESIS