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  • Title: Pressure-induced chemical decomposition and structural changes of boric acid.
    Author: Kuznetsov AY, Pereira AS, Shiryaev AA, Haines J, Dubrovinsky L, Dmitriev V, Pattison P, Guignot N.
    Journal: J Phys Chem B; 2006 Jul 20; 110(28):13858-65. PubMed ID: 16836334.
    Abstract:
    A combined synchrotron X-ray diffraction, Raman scattering, and infrared spectroscopy study of the pressure-induced changes in H(3)BO(3) to 10 GPa revealed a new high-pressure phase transition between 1 and 2 GPa followed by chemical decomposition into cubic HBO(2), ice-VI, and ice- VII at approximately 2GPa. The layered triclinic structure of H(3)BO(3) exhibits a highly anisotropic compression with maximum compression along the c direction, accompanied by a strong reduction of the interlayer spacing. The large volume variation and structural changes accompanying the decomposition suggest high activation energy. This yields a slow reaction kinetics at room temperature and a phase composition that is highly dependent on the specific pressure-time path followed by the sample. The combined results have been used to propose a mechanism for pressure-induced dehydration of H(3)BO(3) that implies a proton disorder in the system.
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