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Structure Determination of the α = 3, β = 6 Term of the (A 3 B 2 O 6 ) α (A 3 B 3 O 9 ) β Homologous Series (A = Ba, B = Rh) by a Combination of Powder X‐ray Diffraction and Electron Microscopy
Author(s) -
Boulahya Khalid,
Hernando María,
Varela Aurea,
GonzálezCalbet José M.,
Parras Marina,
Amador Ulises,
Martínez José L.
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200203)2002:4<805::aid-ejic805>3.0.co;2-y
Subject(s) - isostructural , chemistry , crystallography , octahedron , crystallite , powder diffraction , homologous series , diffraction , electron diffraction , x ray crystallography , electron microscope , crystal structure , optics , physics
The α = 3, β = 6 term of the series (A 3 B 2 O 6 ) α (A 3 B 3 O 9 ) β has been synthesized in polycrystalline form. The structural characterization by powder X‐ray diffraction, electron diffraction and high‐resolution electron microscopy indicates that this material is isostructural with Ba 9 Co 8 O 24 . In the structure, seven face‐sharing octahedra alternate with a trigonal prism defining chains running parallel to the c axis of a rhombohedral unit cell ( R $\bar 3$ c ), with parameters a = 1.00766(4) nm and c = 4.1571(2) nm. The structural refinement shows the presence of a small percentage of Rh vacancies leading to the composition Ba 9 Rh 7.92 O 24 . Pauli paramagnetic behaviour is observed. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)