Raman spectroscopic study of K-lingunite at various pressures and temperatures

Authors: Liu, Lin-gun¹; Lin, C.-C.²; Yung, Y.²; Mernagh, T.³; Irifune, T.⁴

Source: Physics and Chemistry of Minerals, Volume 36, Number 3, March 2009 , pp. 143-149(7)

Publisher: Springer

Buy & download fulltext article:

Price: $47.00 plus tax (Refund Policy)

Abstract:

K-lingunite is a high-pressure modification of K-feldspar that possesses the tetragonal hollandite structure. Variations of the Raman spectra of K-lingunite were studied up to ~31.5 GPa at room temperature, and in the range 79-823 K at atmospheric pressure. The Raman frequencies of all bands were observed to increase with increasing pressure, and decrease with increasing temperature for K-lingunite. This behavior is in line with those observed for most of other materials. New sharp Raman bands appear at pressures greater than 13-15 GPa, suggesting a phase transition in K-lingunite with increasing pressure. The transition is reversible when pressure was released. The appearance of these new Raman bands may correspond to the phase transition revealed earlier at around 20 GPa by X-ray diffraction studies. Instead of transforming back to its stable minerals, such as orthoclase, microcline or sanidine, K-lingunite became amorphous in the temperature range 803-823 K at atmospheric pressure.

Keywords: K-lingunite; Raman spectroscopy; High pressure; High temperature

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s00269-008-0264-0

Affiliations: 1: Institute of Earth Sciences, Academia Sinica, Taipei, 115, Taiwan, ROC, Email: liulg@hkucc.hku.hk 2: Institute of Earth Sciences, Academia Sinica, Taipei, 115, Taiwan, ROC 3: Geoscience Australia, GPO Box 378, Canberra, ACT, 2601, Australia 4: Geodynamics Research Center, Ehime University, Matsuyama, 790, Japan

Publication date: 2009-03-01