Physical Review Letters -- March 10, 1997
Volume 78, Issue 10, pp. 1936-1939
Evidence for ``Partial'' (Sublattice) Amorphization in Co(OH)2
- Jeffrey H. Nguyen,1 Michael B. Kruger,2 and Raymond Jeanloz3
- 1Department of Physics, University of California, Berkeley, California 94720
- 2Department of Physics, University of Missouri, Kansas City, Missouri 64110
- 3Departments of Geology and Geophysics, University of California, Berkeley, California 94720
Infrared absorption and Raman spectroscopy under pressure document that the O-H bonds of crystalline Co(OH)2 become disordered when the sample is compressed to 11.2((plus-minus)0.3)GPa at room temperature. The disorder is reversible on decompression, but involves only the H sublattice: x-ray diffraction shows that the Co-O sublattice of Co(OH)2 retains long-range order between 0 and 30 GPa. The results document a novel form of pressure-induced disordering, sublattice amorphization, and imply that amorphization transitions can be staged, with the crystal(right-arrow)glass transition being achieved through the successive disordering of sublattices.
| History |
Received: 17 October 1996
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| Subject |
Equations of state, phase equilibria, and phase transitions |
| PACS |
- CODE: 64.30.+t
Equations of state, phase equilibria, and phase transitions : Equations of state of specific substances - CODE: 62.50.+p
Mechanical and acoustical properties of condensed matter : High-pressure and shock-wave effects in solids and liquids - CODE: 64.70.Pf
Equations of state, phase equilibria, and phase transitions : Specific phase transitions : [Glass transitions]
- YEAR: 1996
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| Keywords | cobalt compounds; amorphisation; infrared spectra; Raman spectra; high-pressure solid-state phase transformations; X-ray diffraction; hydrogen bonds; hydrogen compounds; oxygen compounds
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| Doc. Type | Experimental
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| Coden | PRLTAO
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| PII |
S0031-9007(97)02520-9
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