Ultrasonic observations of elasticity changes across phase transformations in MgSiO3 pyroxenes

Jennifer Kung, Baosheng Li, Robert C. Liebermann

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7 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2051-2055
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Issue number9-10
Publication statusPublished - 2006 Sept

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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