title: Thermo-Raman spectroscopic study of the natural layered double hydroxide manasseite.
abstract: Raman and thermo-Raman spectroscopy have been applied to study the natural hydrotalcite manasseite Mg(6)Al(2)(OH)(16)(CO(3)).4H(2)O. Hydrogen bond distances calculated using a Libowitzky-type empirical function varied between 2.61 and 3.00A. Stronger hydrogen bonds were formed by water units as compared to the hydroxyl units. Thermo-Raman spectroscopy enabled the identification of bands attributed to the hydroxyl units. Two Raman bands at 1062 and 1058 cm(-1) are assigned to symmetric stretching modes of the carbonate anion. Thermal treatment shifts these bands to higher wavenumbers indicating a change in the carbonate bonding.
authors.affiliation: Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Qld. 4001, Australia. r.frost@qut.edu.au <r.frost@qut.edu.au>
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: B Jagannadha
authors.initials: BJ
authors.lastname: Reddy
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D006358:Hot Temperature; D006860:Hydrogen Bonding; D008276:Magnesium Hydroxide / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman / Q000379:methods*
chemical_list: C010467:hydrotalcite; D000536:Aluminum Hydroxide; D008276:Magnesium Hydroxide