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Title: Raman and X-Ray Investigation of Pyrope Garnet (Mg{0.76}Fe{0.14}Ca{0.10}){2}A1{2}Si{3}O{12}

Abstract

The compressional behaviour of natural pyrope garnet is investigated by using angle-dispersive synchrotron radiation x-ray diffraction and Raman spectroscopy in a diamond anvil cell at room temperature. The pressure-induced phase transition does not occur under given pressure. The equation of state of pyrope garnet is determined under pressure up to 25.3 GPa. The bulk modulus KT0 is 199 GPa, with its first pressure derivative K'T0 fixed to 4. The Raman spectra of pyrope garnet are studied. A new Raman peak nearly at 743 cm-1 is observed in a bending vibration of the SiO4 tetrahedra frequency range at pressure of about 28 GPa. We suggest that the new Raman peak results from the lattice distortion of the SiO4 tetrahedra. All the Raman frequencies continuously increase with the increasing pressure. The average pressure derivative of the high frequency modes (650-1000 cm-1) is larger than that of the low frequency (smaller than 650 cm-1). Based on these data, the mode Grueneisen parameters for pyrope are obtained.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
960166
Report Number(s):
BNL-83152-2009-JA
Journal ID: ISSN 0256-307X; CPLEEU; TRN: US1005913
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chinese Physics Letters; Journal Volume: 24; Journal Issue: 5
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; BENDING; DIAMONDS; FREQUENCY RANGE; GARNETS; RAMAN SPECTRA; RAMAN SPECTROSCOPY; SYNCHROTRON RADIATION; X-RAY DIFFRACTION; national synchrotron light source

Citation Formats

Ma,Y., Chen, H., Li, X., Gao, L., Cui, Q., and Zou, G.. Raman and X-Ray Investigation of Pyrope Garnet (Mg{0.76}Fe{0.14}Ca{0.10}){2}A1{2}Si{3}O{12}. United States: N. p., 2007. Web.
Ma,Y., Chen, H., Li, X., Gao, L., Cui, Q., & Zou, G.. Raman and X-Ray Investigation of Pyrope Garnet (Mg{0.76}Fe{0.14}Ca{0.10}){2}A1{2}Si{3}O{12}. United States.
Ma,Y., Chen, H., Li, X., Gao, L., Cui, Q., and Zou, G.. Mon . "Raman and X-Ray Investigation of Pyrope Garnet (Mg{0.76}Fe{0.14}Ca{0.10}){2}A1{2}Si{3}O{12}". United States. doi:.
@article{osti_960166,
title = {Raman and X-Ray Investigation of Pyrope Garnet (Mg{0.76}Fe{0.14}Ca{0.10}){2}A1{2}Si{3}O{12}},
author = {Ma,Y. and Chen, H. and Li, X. and Gao, L. and Cui, Q. and Zou, G.},
abstractNote = {The compressional behaviour of natural pyrope garnet is investigated by using angle-dispersive synchrotron radiation x-ray diffraction and Raman spectroscopy in a diamond anvil cell at room temperature. The pressure-induced phase transition does not occur under given pressure. The equation of state of pyrope garnet is determined under pressure up to 25.3 GPa. The bulk modulus KT0 is 199 GPa, with its first pressure derivative K'T0 fixed to 4. The Raman spectra of pyrope garnet are studied. A new Raman peak nearly at 743 cm-1 is observed in a bending vibration of the SiO4 tetrahedra frequency range at pressure of about 28 GPa. We suggest that the new Raman peak results from the lattice distortion of the SiO4 tetrahedra. All the Raman frequencies continuously increase with the increasing pressure. The average pressure derivative of the high frequency modes (650-1000 cm-1) is larger than that of the low frequency (smaller than 650 cm-1). Based on these data, the mode Grueneisen parameters for pyrope are obtained.},
doi = {},
journal = {Chinese Physics Letters},
number = 5,
volume = 24,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}