INTEQUI 20941
INSTITUTO DE INVESTIGACIONES EN TECNOLOGIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
A new polymorph of GaAsO4
Autor/es:
F.M. TUNEZ; J.A. GONZALEZ; J.ANDRADE-GAMBOA; 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 a berlinite type structure (AlPO4, P3121) and it is the only normal pressure polymorph reported as occurring at all temperatures. By means of a gaseous phase route, GaAsO4 was obtained in a structure homeotypic with a-cristobalite and was retained at room temperature. Structural Rietveld refinement of this new GaAsO4 polymorph was performed based on space group C2221 and refined lattice parameters are a=7.0592 Å, b=7.0893 Å, c=7.0977 Å. Heating up to 1000 °C the a-cristobalite homeotype transforms to the stable berlinite type structure and it would invert to the b-cristobalite homeotype at about 530 °C.
