Data di Pubblicazione:
2021
Citazione:
Thermal and compressional behavior of the natural borate kurnakovite, MgB3O3(OH)5·5H2O / F. Pagliaro, P. Lotti, T. Battiston, D. Comboni, G.D. Gatta, F. Cámara, S. Milani, M. Merlini, K. Glazyrin, H. Liermann. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - 266:part B(2021 Jan 10), pp. 121094.1-121094.13. [10.1016/j.conbuildmat.2020.121094]
Abstract:
The thermal and compressional behaviors of kurnakovite, a potential B-rich aggregate in neutron
radiation-shielding concretes, were studied by in situ single-crystal synchrotron X-ray diffraction (100–
393 K, 0–13.36(5) GPa). Above 393 K, the crystal structure collapses in response to dehydration. The bulk
thermal expansion coefficient is aV(298K) = 5.18(1)∙105 K1. Volume compressional trend modelled with a
Birch-Murnaghan equation of state yields a bulk modulus of KP0,T0 = 35(3) GPa. A phase transition occurs
between 9.23(5) and 11.11(5) GPa, leading to a triclinic high-P polymorph (with triple unit-cell volume)
and to an increase in coordination of one third of the trigonal-planar boron sites to a tetrahedral
geometry.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Kurnakovite; Borates; Single-crystal diffraction; B-rich aggregate; High temperature; High pressure
Elenco autori:
F. Pagliaro, P. Lotti, T. Battiston, D. Comboni, G.D. Gatta, F. Cámara, S. Milani, M. Merlini, K. Glazyrin, H. Liermann
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