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Pressure-induced phase transitions and volume changes in Hf02 up to Gpa

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Pressure-induced phase transitions and volume changes in Hf02 up to Gpa

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Título Pressure-induced phase transitions and volume changes in Hf02 up to Gpa
Autor Leger, Jean Michel
Atouf, A.
Tomaszewski, P.E.
Pereira, Altair Soria
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.
Contido em Physical review. B, Condensed matter. New York. Vol. 48, no. 1 (July 1993), p.93-98
Assunto Altas pressoes
Difracao de raios x
Materia condensada
Supercondutividade
Zircônia : Materiais cerâmicos
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104236
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