A vibrational spectroscopic study of the silicate mineral harmotome--(Ba,Na,K)1-2(Si,Al)8O16⋅6H2O--a natural zeolite

Ray L Frost; Andrés López; Lina Wang; Antônio Wilson Romano; Ricardo Scholz

doi:10.1016/j.saa.2014.07.072

A vibrational spectroscopic study of the silicate mineral harmotome--(Ba,Na,K)1-2(Si,Al)8O16⋅6H2O--a natural zeolite

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Feb 25:137:70-4. doi: 10.1016/j.saa.2014.07.072. Epub 2014 Aug 10.

Authors

Ray L Frost¹, Andrés López², Lina Wang³, Antônio Wilson Romano⁴, Ricardo Scholz⁵

Affiliations

¹ School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. Electronic address: r.frost@qut.edu.au.
² School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
³ School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia; School of Chemistry and Chemical Engineering, Tianjin University of Technology, No. 391, Bin Shui West Road, Xi Qing District, Tianjin, PR China.
⁴ Geology Department, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil.
⁵ Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35400-00, Brazil.

PMID: 25203212
DOI: 10.1016/j.saa.2014.07.072

Abstract

The mineral harmotome (Ba,Na,K)1-2(Si,Al)8O16⋅6H2O is a crystalline sodium calcium silicate which has the potential to be used in plaster boards and other industrial applications. It is a natural zeolite with catalytic potential. Raman bands at 1020 and 1102 cm(-1) are assigned to the SiO stretching vibrations of three dimensional siloxane units. Raman bands at 428, 470 and 491 cm(-1) are assigned to OSiO bending modes. The broad Raman bands at around 699, 728, 768 cm(-1) are attributed to water librational modes. Intense Raman bands in the 3100 to 3800 cm(-1) spectral range are assigned to OH stretching vibrations of water in harmotome. Infrared spectra are in harmony with the Raman spectra. A sharp infrared band at 3731 cm(-1) is assigned to the OH stretching vibration of SiOH units. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the silicate mineral harmotome.

Keywords: Barium; Harmotome; Infrared spectroscopy; Raman spectroscopy; Silicate; Zeolite.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Barium / chemistry*
Spectrophotometry, Infrared
Spectrum Analysis, Raman
Zeolites / chemistry*

Substances

Zeolites
Barium