Other
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1157m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, July 1990, p. 1157-1160. Research supported by NASA.
Other
61
Calcium Compounds, Compression Loads, Earth Mantle, Elastic Properties, Equations Of State, Hydroxides, Hydrogen Bonds, Room Temperature, X Ray Diffraction
Scientific paper
X-ray diffraction measurements are reported for Ca(OH)2 portlandite as it is compressed to 37.6 GPa in the diamond cell at room temperature. Between 10.7 and 15.4 GPa crystalline Ca(OH)2 transforms to a glass, and on decompression the glass recrystallizes between 3.6 and 5.1 GPa. Below pressures of 10.7 GPa the elastic compression of crystalline Ca(OH)2 was measured. A finite strain analysis of these data shows that the isothermal bulk modulus and its pressure derivative are 37.8 + or - 1.8 GPa and 5.2 + or - 0.7 at zero pressure. The change in the unit cell dimensions indicates that the linear incompressibilities of Ca(OH)2 differ by a factor of three.
Jeanloz Raymond
Meade Charles
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