Traces of structural H2O molecules in baryte

Autor(en)

Anton Beran, Dominik Talla, Zdenek Losos, Jiri Pinkas

Abstrakt

The infrared (IR) spectra of gem-quality barytecrystals from different occurrences are characterized byrelatively weak but strongly pleochroic absorption bands at3,280, 3,220, 3,155, and 3,115 cm-1. These bands areassigned to anti-symmetric and symmetric OH stretchingvibrations of two types of H2O molecules localized onvacant Ba sites. The H-H axis of the H2O I molecule isslightly tilted from the a-axis direction, its twofold axisbeing nearly parallel to the b-axis, thus defining the planeof the H2O molecule practically parallel to (001). The H2OII molecule has its H-H axis parallel to the b-axis direction,with its plane lying approximately parallel to (101). Thevalues of the total water contents of the baryte crystals,calculated on the basis of IR spectroscopic data, areranging from about 1.7-3.8 wt.ppm. The possible presenceof H3O? ions is also discussed.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Masaryk University

Journal

Physics and Chemistry of Minerals

Band

37

Seiten

159-166

Anzahl der Seiten

8

ISSN

0342-1791

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie, 105116 Mineralogie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2f82ae4e-c8dd-4f63-ad6f-bbc7bc753f12