Title: Structure and bonding in hydrous minerals at high pressure: Raman spectroscopy of alkaline earth hydroxides
Abstract: The high‐pressure behavior of the hydrous minerals brucite and portlandite was examined by Raman spectroscopy in a diamond anvil cell. Both the hydrogenated and deuterated forms of brucite [Mg(OH)2, Mg(OD)2] show evidence for structural changes that are first detectable at 4‐5 GPa, and these materials remain crystalline to pressures upwards of 30 GPa. Portlandite [Ca(OH)2] becomes amorphous when compressed above 12 GPa. It is proposed that both the structural changes in brucite and amorphization of portlandite are driven by a destabilization of the H substructure as the materials are compressed. In brucite, the hydrogen and deuterium atoms adopt new positions which stabilize the structure to very high pressure. In portlandite, disordering of the hydrogens triggers destabilization of the oxygen substructure, leading to pressure‐induced amorphization.
Publication Year: 1995
Publication Date: 1995-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 8
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