Compression mechanism and pressure-induced amorphization of [upsilon]-ZrW/sub 2/O/sub 8/

• Autor(a) principal: Figueiredo, Camila Araújo de
• Data de Publicação: 2007
• Outros Autores: Catafesta, Jadna, Zorzi, Janete Eunice, Souza, Leonardo Salvador, Baumvol, Israel Jacob Rabin, Gallas, Marcia Russman, Jornada, Joao Alziro Herz da, Perottoni, Claudio Antonio
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/104512
• topic: Física da matéria condensada

The structure of [upsilon]-ZrW2O8 has been optimized at zero pressure and also at V/V0=0.97 by means of density functional theory calculations using the B3LYP functional. As previously found for [upsilon]-ZrW2O8, tungsten polyhedra are stiffer than zirconium octahedra in -ZrW2O8. However, contrary to what has been found for [upsilon]-ZrW2O8, all first coordination polyhedra in the phase are less compressible than the unit cell. Volume reduction in [upsilon]-ZrW2O8 is, thus, mainly accomplished by polyhedral tilting. Upon pressure increase, the distance between the terminal oxygen and W atoms from the nearest polyhedra decreases by as much as 3.66% for the pair O101-W6 . Accordingly, a further reduction in the zirconium tungstate molar volume with the high-pressure transition to the amorphous phase should bring several oxygen atoms within the threshold of bond formation to W. O 1s photoelectron spectra provide further experimental evidence on the formation of additional W-O bonds in amorphous zirconium tungstate. These new W-O bonds should enable the metastable retention of the amorphous phase upon pressure release.