High-pressure raman spectroscopy and x-ray diffraction study on scottyite, bacu2si2o7

Pei Lun Lee, Eugene Huang, Jennifer Kung

研究成果: Article同行評審

摘要

In situ high-pressure synchrotron X-ray diffraction and Raman spectroscopic experiments of scottyite, BaCu2Si2O7, were carried out in a diamond anvil cell up to 21 GPa at room temperature. X-ray diffraction patterns reveal four new peaks near 3.5, 3.1, 2.6 and 2.2 Å above 8 GPa, while some peaks of the original phase disappear above 10 GPa. In the Raman experiment, we observed two discontinuities in dν/dP, the slopes of Raman wavenumber (ν) of some vibration modes versus pressure (P), at approximately 8 and 12 GPa, indicating that the Si-O symmetrical and asymmetrical vibration modes change with pressure. Fitting the compression data to Birch–Murnaghan equation yields a bulk modulus of 102 ± 5 GPa for scottyite, assuming Ko is four. Scottyite shows anisotropic compressibility along three crystallographic axes, among which c-axis was the most compressible axis, b-axis was the last and a-axis was similar to the c-axis on the compression. Both X-ray and Raman spectroscopic data provide evidences that scottyite undergoes a reversible phase transformation at 8 GPa.

原文English
文章編號608
期刊Minerals
11
發行號6
DOIs
出版狀態Published - 2021 六月

All Science Journal Classification (ASJC) codes

  • 岩土工程與工程地質
  • 地質學

指紋

深入研究「High-pressure raman spectroscopy and x-ray diffraction study on scottyite, bacu<sub>2</sub>si<sub>2</sub>o<sub>7</sub>」主題。共同形成了獨特的指紋。

引用此