The crystal structure of MgB20 has been investigated by X-ray and synchrotron powder diffraction at room temperature. As it happens in other metal-boron systems, the Rietveld refinement of this magnesium boron-rich phase shows a structure derived directly from b-boron. The substantially unaltered B–B framework hosts magnesium atoms in three different atomic positions (D, E and F holes); the occupancy of these sites is partial. The resulting unit cell is trigonal with space group R3m, the refined hexagonal axes a=1.09830(4) and c=2.41561(15) nm.
Synchrotron powder diffraction Rietveld refinement of MgB20 crystal structure / Brutti, S.; Colapietro, Marcello; Balducci, Giovanni; Barba, L.; Manfrinetti, P.; Palenzona, A.. - In: INTERMETALLICS. - ISSN 0966-9795. - STAMPA. - 10:8(2002), pp. 811-817. [10.1016/s0966-9795(02)00060-2]
Synchrotron powder diffraction Rietveld refinement of MgB20 crystal structure
S. Brutti;COLAPIETRO, Marcello;BALDUCCI, Giovanni;
2002
Abstract
The crystal structure of MgB20 has been investigated by X-ray and synchrotron powder diffraction at room temperature. As it happens in other metal-boron systems, the Rietveld refinement of this magnesium boron-rich phase shows a structure derived directly from b-boron. The substantially unaltered B–B framework hosts magnesium atoms in three different atomic positions (D, E and F holes); the occupancy of these sites is partial. The resulting unit cell is trigonal with space group R3m, the refined hexagonal axes a=1.09830(4) and c=2.41561(15) nm.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
