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Structural and Spectroscopic Study of the (Mg, Ni)2(OH)(AsO4) Arsenates

✍ Scribed by José M. Rojo; José L. Mesa; José L. Pizarro; Luis Lezama; Marı́a I. Arriortua; Teófilo Rojo

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
536 KB
Volume
132
Category
Article
ISSN
0022-4596

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✦ Synopsis

Compounds of general formula (Mg 2؊x Ni x )(OH)(AsO 4 ) (x‫0؍‬ and 0.45) have been synthesized and characterized. The crystal structures of these compounds have been refined using X-ray powder diffraction data. The structure of the compounds contains two kinds of oxygen polyhedra coordinating to the metal atoms, an octahedron and a trigonal bipyramid. In the magnesium-nickel hydroxyarsenate the Ni(II) ions are preferentially placed in the hexacoordinated polyhedra. Diffuse reflectance study of the magnesium-nickel compound shows bands belonging to the two chromophores of the Ni(II) ions. The ESR spectrum of the (Mg 1.55 Ni 0.45 )(OH)(AsO 4 ) phase doped with 1% Co 2؉ exhibits signals of this cation in both octahedron and trigonal bipyramid coordination polyhedra. A comparative study with the homologous cobalt-hydroxyarsenate phases has also been carried out.

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