Infrared study of magnesium–nickel hydroxide solid solutions

• Published in: Vibrational spectroscopy Vol. 31; no. 1; pp. 19 - 24
• Main Authors: de Oliveira, E.F., Hase, Y.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.01.2003
• Subjects: IR spectroscopy; Magnesium–nickel hydroxide; Solid solution; Solid solution; IR spectroscopy; Magnesium–nickel hydroxide
• ISSN: 0924-2031; 1873-3697
• DOI: 10.1016/S0924-2031(02)00049-8

The IR spectra of the co-precipitated solid solutions Mg x Ni 1− x (OH) 2 were studied in the 4000–40 cm −1 region. The spectra as a whole resemble those of Mg(OH) 2 and β-Ni(OH) 2, while certain differences are noted when compared with the spectra of the mechanically mixed samples Mg(OH) 2+β-Ni(OH) 2. Such a behavior may imply formations of mono-phase solid solutions which have a brucite-like crystal structure. The composition-dependent band shifts were observed for the fundamentals and this tendency is discussed in terms of polarization of the OH bond and partial covalency of the MO bonds. The gradual changes in band position of Mg x Ni 1− x (OH) 2 (1.00≥ x≥0.00) were used to assign the IR active lattice modes of the solid solutions and to review the assignment of β-Ni(OH) 2.