A Raman spectroscopic study of the phase transition in omphacite

TY - JOUR

T1 -  A Raman spectroscopic study of the phase transition in omphacite

AU - Katerinopoulou, Anna

AU - Musso, Maurizio

AU - Amthauer, Georg

PY - 2008

Y1 - 2008

N2 - Omphacites are very important in petrology because of their occurrence in rocks metamorphosed under high-pressure conditions. They have a wide thermobaric range of stability. Raman spectra of a natural, iron-bearing, ordered omphacite have been studied and compared with the experimentally disordered spectra. The order-disorder phase transition causes extra modes in the spectra. The ordering state affects the full width at half maximum (FWHM) of the main omphacite peak at 680 cm_1. Ordered omphacite shows a split peak around 1010 cm_1 caused by the slightly different orientation of tetrahedra in the monoclinic chain.

AB - Omphacites are very important in petrology because of their occurrence in rocks metamorphosed under high-pressure conditions. They have a wide thermobaric range of stability. Raman spectra of a natural, iron-bearing, ordered omphacite have been studied and compared with the experimentally disordered spectra. The order-disorder phase transition causes extra modes in the spectra. The ordering state affects the full width at half maximum (FWHM) of the main omphacite peak at 680 cm_1. Ordered omphacite shows a split peak around 1010 cm_1 caused by the slightly different orientation of tetrahedra in the monoclinic chain.

KW - Faculty of Science

KW - Raman

KW - Phase transition

KW - Pyroxenes

KW - Omphacite

U2 - 10.1016/j.vibspec.2007.12.015

DO - 10.1016/j.vibspec.2007.12.015

M3 - Journal article

SN - 0924-2031

VL - 48

SP - 163

EP - 167

JO - Vibrational Spectroscopy

JF - Vibrational Spectroscopy

ER -