TY - JOUR
T1 - Ultrasonic observations of elasticity changes across phase transformations in MgSiO3 pyroxenes
AU - Kung, Jennifer
AU - Li, Baosheng
AU - Liebermann, Robert C.
N1 - Funding Information:
We thank the staff of beamline 13-ID, GSECARS, and especially T. Uchida and Y. Wang for their support of these experiments. We also thank J. Hu, H. Liu and Z. Liu for assistance in conducting the in-situ X-ray DAC experiment on beamline X17C and the Raman study on beamline U2A at National Synchrotron Light Source (NSLS). This study is supported by the National Science Foundation under the Grants EAR0003340 to B.L. and EAR0229704 to R.C.L. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. W-31-109-ENG-38 and of the NSLS under Contract No. DE-AC02-98CH10886 and by COMPRES, the NSF Consortium for Materials Properties Research in Earth Sciences, MPI Publication No. 359.
PY - 2006/9
Y1 - 2006/9
N2 - Using ultrasonic interferometry in conjunction with synchrotron X-radiation techniques in a high-pressure, multi-anvil apparatus, the elastic behavior of MgSiO3 pyroxene has been continuously monitored as the specimens undergo phase transformations from the orthoenstatite (OEN) to the high-pressure clinoenstatite phase (HP-CEN) and from HP-CEN to the low-pressure clinoenstatite phase (LP-CEN). In the former case, elastic softening and amplitude attenuation is observed for both compresssional (P) and shear (S) waves when the pressure exceeds 9 GPa at room temperature, which we suggest is associated with a transition to a metastable phase intermediate between OEN and HP-CEN. In the latter case, both P and S wave velocities decrease rapidly as the back-transformation from HP-CEN to LP-CEN occurs on decrease of pressure below 4 GPa at room temperature; this is accompanied by an increase in attenuation of the P waves in the specimen, but not the S waves.
AB - Using ultrasonic interferometry in conjunction with synchrotron X-radiation techniques in a high-pressure, multi-anvil apparatus, the elastic behavior of MgSiO3 pyroxene has been continuously monitored as the specimens undergo phase transformations from the orthoenstatite (OEN) to the high-pressure clinoenstatite phase (HP-CEN) and from HP-CEN to the low-pressure clinoenstatite phase (LP-CEN). In the former case, elastic softening and amplitude attenuation is observed for both compresssional (P) and shear (S) waves when the pressure exceeds 9 GPa at room temperature, which we suggest is associated with a transition to a metastable phase intermediate between OEN and HP-CEN. In the latter case, both P and S wave velocities decrease rapidly as the back-transformation from HP-CEN to LP-CEN occurs on decrease of pressure below 4 GPa at room temperature; this is accompanied by an increase in attenuation of the P waves in the specimen, but not the S waves.
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U2 - 10.1016/j.jpcs.2006.05.028
DO - 10.1016/j.jpcs.2006.05.028
M3 - Article
AN - SCOPUS:33748174627
SN - 0022-3697
VL - 67
SP - 2051
EP - 2055
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 9-10
ER -