INVESTIGADORES
ESQUIVEL Marcelo Ricardo Oscar
artículos
Título:
A new polymorph of GaAsO4
Autor/es:
F.M. TÚNEZ; J.J. ANDRADE GAMBOA; J.A. GONZÁLEZ; M.R ESQUIVEL
Revista:
MATERIALS LETTERS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 79 p. 202 - 204
ISSN:
0167-577X
Resumen:
At room temperature, the compound GaAsO4 (gallium arsenate) has berlinitetype structure (AlPO4, P3121) and it is the only normal pressure polymorph reported asoccurring at all temperatures. By means of a gaseous phase route, GaAsO4 was obtainedin a structure homeotypic with -cristobalite and retained at room temperature.Structural Rietveld refinement of this new GaAsO4 polymorph was performed based onspace group C2221 and refined lattice parameters are a = 7.0593 Å, b = 7.0893 Å, c =7.0977 Å. Heating up to 1000 ºC -cristobalite homeotype transforms to the stableberlinite type structure and it would invert to -cristobalite homeotype at about 530 ºC.
