Compositionally induced phase transitions and symmetry relations between space groups in the layered system FeIn1−xYxGe2O7

Autor:	Ivonne Rosales, Eligio Orozco, Lauro Bucio, Rosario Moreno-Tovar
Rok vydání:	2018
Předmět:	Phase transition Rietveld refinement Chemistry Group (mathematics) Metals and Alloys Space group Atom (order theory) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Space (mathematics) 01 natural sciences Atomic and Molecular Physics and Optics Symmetry (physics) 0104 chemical sciences Electronic Optical and Magnetic Materials Crystallography chemistry.chemical_compound Materials Chemistry 0210 nano-technology Derivative (chemistry)
Zdroj:	Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 74:394-402
ISSN:	2052-5206
DOI:	10.1107/s2052520618009654
Popis:	Symmetry reduction in the basic structure of thortveitite-type compound FeInGe2O7–mC22 (C12/m1, No. 12) promoted by the incorporation of yttrium in the formula FeIn1−xYxGe2O7gives rise to a derivative structure called thortveitite-likeAA′Ge2O7–mP44, with symmetry described by the space groupP121/m1 (No. 11) forx= 0.50, 0.75 and 0.90. The structure remains unchanged within the structural type of thortveitite whenx= 0.25. In order to establish structural models for performing a Rietveld refinement to the derivative structure, symmetry relations between space groups connecting the basic and derivative structures were used. The higher contrast to X-rays of Fe3+, In3+and Y3+as well as by the behaviour during the refinements of the isotropic thermal displacements, the values of interatomic distances and calculated bond-valence sums for each atom in the asymmetric unit, were helpful for elucidating the relocation of cations in the different available crystallographic sites generated by the symmetry reduction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::aaba79571101751cb2aa4e9878a924df https://doi.org/10.1107/s2052520618009654 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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