Crystal chemistry of kernite mineral [Na2B4O6(OH)2·3H2O]: a sustainable approach for boron-based cements
Kernite, ideally Na2B4O6(OH)2·3H2O, is a complex hydrous borate mineral. Despite the geochemical and the industrial interest on kernite (in particular for the production of radiation-shielding concretes), only a few studies were devoted to this mineral. Its structure was solved and refined by Cooper et al. (1973), on the basis of X-ray diffraction data, and no more recent data are available. The occurrence of OH-groups and cation-coordinated H2O generates the need for a structure model with an accurate location of the H-sites. In this light, and considering the important role played by the H-bonding network on the phase stability of kernite, the aim of the present study is a reinvestigation of its crystal chemistry by single-crystal neutron diffraction, EPMA-WDS and LA-ICP-MAS. With this multi-methodological approach, we expect to provide: the location of all the proton sites; the anisotropic displacement parameters of all the atomic sites, including the H-sites; the description of the complex H-bonding network expected in kernite structure, along its low-T induced rearrangement; a robust description, based on modern standards, of the B-coordination environment.
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GATTA Giacomo Diego; FABELO ROSA Oscar Ramon and FERNANDEZ DIAZ Maria Teresa. (2019). Crystal chemistry of kernite mineral [Na2B4O6(OH)2·3H2O]: a sustainable approach for boron-based cements. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.DIR-179
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