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.
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]
Thermal and compressional behavior of the natural borate kurnakovite, MgB3O3(OH)5·5H2O
F. PagliaroPrimo
Writing – Review & Editing
;P. Lotti
Secondo
Writing – Review & Editing
;T. BattistonInvestigation
;D. ComboniInvestigation
;G.D. GattaWriting – Review & Editing
;F. CámaraMembro del Collaboration Group
;S. MilaniInvestigation
;M. MerliniInvestigation
;
2021
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.File | Dimensione | Formato | |
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