Structural phase transition in GaMo4Se8 and AlMo4S8 by X-ray powder diffraction
Abstract
GaMo4Se8 (I) and AlMo4S8 (II) transform at T1 = 45(2) K and 24(2) K, respectively, from a cubic high-temperature modification with ordered defect spinel structure (space group F[unk]3m, a = 10.1747(2) Å (I), 9.7289(2) Å (II) at 300 K) to a rhombohedrally distorted low-temperature modification (R3m, arh = 7.1537(3) Å, 6.8500(3) Å (II), αrh = 60.572(5)°, 60.374(5)° (II) at 10 K). Structure parameters for both modifications are refined by the Rietveld method from X-ray powder data recorded at T = 300 K (I, II), 60 K (I), 50 K (II) and 10 K (I, II) on a Guinier diffractometer. In the cubic modification the tetrahedral Mo4 clusters have [unk]3m symmetry and intracluster bond lengths of [Mo – Mo] = 2.881(2) Å (I), 2.829(2) Å (II). During the phase transition their symmetry is reduced to 3m as they expand each by about 0.05 Å at one of their triangular bases.
Articles in the same Issue
- Crystal structure of a cholesterogen – cholesteryl methyl carbonate (CMC)
- An X-ray search for anharmonicity in indium phosphide
- Crystal structure and spectra of bis[p-chloro-benzoyl-di-(2-pyridyl)ketonohydrazono]uranyl
- Crystal structures of isomorphous triaquatris(3-aminobenzoato-O, O)yttrium(III) trihydrate and triaquatris(3-aminobenzoato-0,0)lanthanide(III) trihydrate
- Crystal structure of calcium hydroxide nitrate hydrate and its superstructure in relation to cadmium hydroxide nitrate hydrate
- Structural phase transition in GaMo4Se8 and AlMo4S8 by X-ray powder diffraction
- The crystal structure of Ce4Ru3
- Allowance for Debye scattering in Wilson-plot least-squares procedures
- The (1:1) adducts of (2,4-dichlorophenoxy)acetic acid with 4-aminobenzoic acid and triphenylphosphine oxide *
- Molecular and crystal structure of a terminally-blocked Aib homotetrapeptide *
- Molecular and crystal structure of Nα-benzyloxycarbonyl-l-proline amide *
- Schwingungsspektroskopische Untersuchungen an SiO2-Clathraten
- Liebauite, Ca3Cu5Si9O26: A new silicate mineral with 14er single chain
- The crystal and molecular structure of tramazoline hydrochloride monohydrate, C13H18N3+Cl−·H2O
- Crystal structure of sphagnum acid, C11H10O5
- High resolution X-ray investigations on the supersatellite reflections of Labradorite
- The crystal structure of di(5-amino-3-thione-l,2,4-dithiazole)-tris-thiocyanatobismuthate (III), (C2H2N2S3)2Bi(SCN)3 determined at 100 K
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Articles in the same Issue
- Crystal structure of a cholesterogen – cholesteryl methyl carbonate (CMC)
- An X-ray search for anharmonicity in indium phosphide
- Crystal structure and spectra of bis[p-chloro-benzoyl-di-(2-pyridyl)ketonohydrazono]uranyl
- Crystal structures of isomorphous triaquatris(3-aminobenzoato-O, O)yttrium(III) trihydrate and triaquatris(3-aminobenzoato-0,0)lanthanide(III) trihydrate
- Crystal structure of calcium hydroxide nitrate hydrate and its superstructure in relation to cadmium hydroxide nitrate hydrate
- Structural phase transition in GaMo4Se8 and AlMo4S8 by X-ray powder diffraction
- The crystal structure of Ce4Ru3
- Allowance for Debye scattering in Wilson-plot least-squares procedures
- The (1:1) adducts of (2,4-dichlorophenoxy)acetic acid with 4-aminobenzoic acid and triphenylphosphine oxide *
- Molecular and crystal structure of a terminally-blocked Aib homotetrapeptide *
- Molecular and crystal structure of Nα-benzyloxycarbonyl-l-proline amide *
- Schwingungsspektroskopische Untersuchungen an SiO2-Clathraten
- Liebauite, Ca3Cu5Si9O26: A new silicate mineral with 14er single chain
- The crystal and molecular structure of tramazoline hydrochloride monohydrate, C13H18N3+Cl−·H2O
- Crystal structure of sphagnum acid, C11H10O5
- High resolution X-ray investigations on the supersatellite reflections of Labradorite
- The crystal structure of di(5-amino-3-thione-l,2,4-dithiazole)-tris-thiocyanatobismuthate (III), (C2H2N2S3)2Bi(SCN)3 determined at 100 K
- The structure type of ludwigite
