Pressure-Induced Chemical Decomposition and Structural Changes of Boric Acid

• DOI: 10.1021/jp061650d
• Publication Date: 2006-06-22T09:34:23Z
• Authors: Alexei Yu. Kuznetsov; Altair S. Pereira; Andrei A. Shiryaev; Julien Haines; Leonid Dubrovinsky; Vladimir Dmitriev; Phil Pattison; Nicolas Guignot
• Keywords: Triclinic crystal system; Ambient pressure

A combined synchrotron X-ray diffraction, Raman scattering, and infrared spectroscopy study of the pressure-induced changes in H3BO3 to 10 GPa revealed a new high-pressure phase transition between 1 2 followed by chemical decomposition into cubic HBO2, ice-VI, ice- VII at ∼2GPa. The layered triclinic structure exhibits highly anisotropic compression with maximum along c direction, accompanied strong reduction interlayer spacing. large volume variation structural accompanying suggest high activation energy. This yields slow reaction kinetics room temperature composition that is dependent on specific pressure−time path sample. results have been used propose mechanism for dehydration implies proton disorder system.