Pressure-induced phase transitions and volume changes in Hf02 up to Gpa
Autor(a) principal: | |
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Data de Publicação: | 1993 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104236 |
Resumo: | 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. |
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Leger, Jean MichelAtouf, A.Tomaszewski, P.E.Pereira, Altair Soria2014-10-07T02:11:34Z19930163-1829http://hdl.handle.net/10183/104236000220091The 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.application/pdfengPhysical review. B, Condensed matter. New York. Vol. 48, no. 1 (July 1993), p.93-98Materia condensadaDifração de raios XSupercondutividadeZircôniaAltas pressõesPressure-induced phase transitions and volume changes in Hf02 up to GpaEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000220091.pdf000220091.pdfTexto completo (inglês)application/pdf812164http://www.lume.ufrgs.br/bitstream/10183/104236/1/000220091.pdf42e4e9cf1100c49b7d34686843769564MD51TEXT000220091.pdf.txt000220091.pdf.txtExtracted Texttext/plain27195http://www.lume.ufrgs.br/bitstream/10183/104236/2/000220091.pdf.txt04ee782114c46d173f6e590424ea0283MD52THUMBNAIL000220091.pdf.jpg000220091.pdf.jpgGenerated Thumbnailimage/jpeg2032http://www.lume.ufrgs.br/bitstream/10183/104236/3/000220091.pdf.jpg7927c5a46a6e881f6213f0be921e9f83MD5310183/1042362024-01-17 04:28:06.58932oai:www.lume.ufrgs.br:10183/104236Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-01-17T06:28:06Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Pressure-induced phase transitions and volume changes in Hf02 up to Gpa |
title |
Pressure-induced phase transitions and volume changes in Hf02 up to Gpa |
spellingShingle |
Pressure-induced phase transitions and volume changes in Hf02 up to Gpa Leger, Jean Michel Materia condensada Difração de raios X Supercondutividade Zircônia Altas pressões |
title_short |
Pressure-induced phase transitions and volume changes in Hf02 up to Gpa |
title_full |
Pressure-induced phase transitions and volume changes in Hf02 up to Gpa |
title_fullStr |
Pressure-induced phase transitions and volume changes in Hf02 up to Gpa |
title_full_unstemmed |
Pressure-induced phase transitions and volume changes in Hf02 up to Gpa |
title_sort |
Pressure-induced phase transitions and volume changes in Hf02 up to Gpa |
author |
Leger, Jean Michel |
author_facet |
Leger, Jean Michel Atouf, A. Tomaszewski, P.E. Pereira, Altair Soria |
author_role |
author |
author2 |
Atouf, A. Tomaszewski, P.E. Pereira, Altair Soria |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Leger, Jean Michel Atouf, A. Tomaszewski, P.E. Pereira, Altair Soria |
dc.subject.por.fl_str_mv |
Materia condensada Difração de raios X Supercondutividade Zircônia Altas pressões |
topic |
Materia condensada Difração de raios X Supercondutividade Zircônia Altas pressões |
description |
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. |
publishDate |
1993 |
dc.date.issued.fl_str_mv |
1993 |
dc.date.accessioned.fl_str_mv |
2014-10-07T02:11:34Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
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http://hdl.handle.net/10183/104236 |
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0163-1829 |
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000220091 |
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0163-1829 000220091 |
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http://hdl.handle.net/10183/104236 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter. New York. Vol. 48, no. 1 (July 1993), p.93-98 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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