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Title: High-pressure Infrared Spectra of Tal and Lawsonite

Abstract

We present high-pressure infrared spectra of two geologically important hydrous minerals: talc, Mg3Si4O10(OH)2 and lawsonite, CaAl2Si2O7(OH)2{center_dot}H2O,{center_dot}at room temperature. For lawsonite, our data span the far infrared region from 150 to 550 cm-1 and extend to 25 GPa. We combine our new spectroscopic data with previously published high-pressure mid-infrared and Raman data to constrain the Gr{umlt u}neisen parameter and vibrational density of states under pressure. In the case of talc, we present high-pressure infrared data that span both the mid and far infrared from 150 to 3800 cm-1 covering lattice, silicate, and hydroxyl stretching vibrations to a maximum pressure of 30 GPa. Both phases show remarkable metastability well beyond their nominal maximum thermodynamic stability at simultaneous high-pressure and high-temperature conditions.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
959613
Report Number(s):
BNL-82599-2009-JA
Journal ID: ISSN 0003-004X; AMMIAY; TRN: US201016%%757
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: American Mineralogist; Journal Volume: 92
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 58 GEOSCIENCES; INFRARED SPECTRA; STABILITY; THERMODYNAMICS; national synchrotron light source

Citation Formats

Scott,H., Liu, Z., Hemley, R., and Williams, Q.. High-pressure Infrared Spectra of Tal and Lawsonite. United States: N. p., 2007. Web. doi:10.2138/am.2007.2430.
Scott,H., Liu, Z., Hemley, R., & Williams, Q.. High-pressure Infrared Spectra of Tal and Lawsonite. United States. doi:10.2138/am.2007.2430.
Scott,H., Liu, Z., Hemley, R., and Williams, Q.. Mon . "High-pressure Infrared Spectra of Tal and Lawsonite". United States. doi:10.2138/am.2007.2430.
@article{osti_959613,
title = {High-pressure Infrared Spectra of Tal and Lawsonite},
author = {Scott,H. and Liu, Z. and Hemley, R. and Williams, Q.},
abstractNote = {We present high-pressure infrared spectra of two geologically important hydrous minerals: talc, Mg3Si4O10(OH)2 and lawsonite, CaAl2Si2O7(OH)2{center_dot}H2O,{center_dot}at room temperature. For lawsonite, our data span the far infrared region from 150 to 550 cm-1 and extend to 25 GPa. We combine our new spectroscopic data with previously published high-pressure mid-infrared and Raman data to constrain the Gr{umlt u}neisen parameter and vibrational density of states under pressure. In the case of talc, we present high-pressure infrared data that span both the mid and far infrared from 150 to 3800 cm-1 covering lattice, silicate, and hydroxyl stretching vibrations to a maximum pressure of 30 GPa. Both phases show remarkable metastability well beyond their nominal maximum thermodynamic stability at simultaneous high-pressure and high-temperature conditions.},
doi = {10.2138/am.2007.2430},
journal = {American Mineralogist},
number = ,
volume = 92,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}