Pressure-induced phase transitions and volume changes in Hf02 up to Gpa
dc.contributor.author | Leger, Jean Michel | pt_BR |
dc.contributor.author | Atouf, A. | pt_BR |
dc.contributor.author | Tomaszewski, P.E. | pt_BR |
dc.contributor.author | Pereira, Altair Soria | pt_BR |
dc.date.accessioned | 2014-10-07T02:11:34Z | pt_BR |
dc.date.issued | 1993 | pt_BR |
dc.identifier.issn | 0163-1829 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/104236 | pt_BR |
dc.description.abstract | The phase transformations and pressure-volume dependence of Hf02 have been investigated at room temperature by angle-dispersive powder x-ray diffraction under high pressure to 50 GPa in a diamond anvil cell. The phase transformation from the monoclinic I (baddeleyite) to orthorhombic phase 11 was observed around 10 GPa. This phase is stable up to 26 GPa where it transforms to a new phase 111 with another orthorhombic unit cell. At about 42 GPa, a third phase transition occurs to phase IV oftetragonal symmetry. The pressure dependences of the cell parameters and volume have been determined. The successive volume discontinuities are 2.5%, 2.5%, and 5%, respectively. The bulk moduli of ali the phases have been calculated from Birch's equation of state and are discussed. The high-pressure phases were found to be metastable at normal pressure. No orthorhombic cotunnite-type structure was observed under pressure at room temperature. Although the structural properties of Hf02 and Zr02 are similar at lower pressures, their evolutions are different above 20 GPa. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. B, Condensed matter. New York. Vol. 48, no. 1 (July 1993), p.93-98 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Materia condensada | pt_BR |
dc.subject | Difração de raios X | pt_BR |
dc.subject | Supercondutividade | pt_BR |
dc.subject | Zircônia | pt_BR |
dc.subject | Altas pressões | pt_BR |
dc.title | Pressure-induced phase transitions and volume changes in Hf02 up to Gpa | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000220091 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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