Spectroscopic and X-Ray Diffraction Studies of Metastable Crystalline-Amorphous Transitions in Ca(OH) 2 and Serpentine
2011; American Geophysical Union; Linguagem: Inglês
10.1029/gm067p0485
ISSN2328-8779
AutoresCharles Meade, Raymond Jeanloz, Russell J. Hemley,
Tópico(s)Thermal and Kinetic Analysis
ResumoSpectroscopic and X-Ray Diffraction Studies of Metastable Crystalline-Amorphous Transitions in Ca(OH)2 and Serpentine Charles Meade, Charles Meade Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Rd Nw, Washington, D.C., 20015, UsaSearch for more papers by this authorRaymond Jeanloz, Raymond Jeanloz Department of Geology and Geophysics, University of California, Berkeley, Ca, 94720, UsaSearch for more papers by this authorR. J. Hemley, R. J. Hemley Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Rd Nw, Washington, D.C., 20015, UsaSearch for more papers by this author Charles Meade, Charles Meade Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Rd Nw, Washington, D.C., 20015, UsaSearch for more papers by this authorRaymond Jeanloz, Raymond Jeanloz Department of Geology and Geophysics, University of California, Berkeley, Ca, 94720, UsaSearch for more papers by this authorR. J. Hemley, R. J. Hemley Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Rd Nw, Washington, D.C., 20015, UsaSearch for more papers by this author Book Editor(s):Yasuhiko Syono, Yasuhiko SyonoSearch for more papers by this authorMurli H. Manghnani, Murli H. ManghnaniSearch for more papers by this author First published: 01 January 1992 https://doi.org/10.1029/GM067p0485Citations: 7Book Series:Geophysical Monograph Series AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onEmailFacebookTwitterLinkedInRedditWechat Summary We document changes in the x-ray diffraction and Raman scattering from samples of Ca(OH)2 and serpentine as they undergo reversible crystalline-amorphous transitions at high pressures and room temperature. These measurements show that the crystalline and high pressure amorphous phases are structurally distinct. We find that the transition mechanisms only require short-range atomic displacements, and that they seem to involve the discrete transformation of crystalline to amorphous material rather than a gradual disordering of the crystal. These results are consistent with previous observations of acoustic emissions during the amorphization of serpentine. 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