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

Submitted by Marise Leite (marise_mg@yahoo.com.br) on 2015-12-18T11:43:52Z No. of bitstreams: 1 ARTIGO_VibrationalSpectroscopicZeolite.pdf: 960469 bytes, checksum: 010eeeedbb3e03add3144260acfc2afe (MD5)Approved for entry into archive by Oliveira Flávia (flavia@sisbin.ufop.br) on 2015-12-22T17:20:24Z (GMT) No. of bitstreams: 1 ARTIGO_VibrationalSpectroscopicZeolite.pdf: 960469 bytes, checksum: 010eeeedbb3e03add3144260acfc2afe (MD5)Made available in DSpace on 2016-01-28T14:43:39Z (GMT). No. of bitstreams: 1 ARTIGO_VibrationalSpectroscopicZeolite.pdf: 960469 bytes, checksum: 010eeeedbb3e03add3144260acfc2afe (MD5) Previous issue date: 2015The 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