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The effect of hydrothermal temperature on the synthesis of monoclinic bismuth vanadate powders

Zhang A., Zhang J.

Materials Science Poland

2009

Vol. 27, No. 4/1

1015--1023

Pure phase monoclinic bismuth vanadate powders of a nanosized diameter were synthesized by the hydrothermal method and characterized using XRD, TEM, DRS, Raman and FTIR techniques. The results revealed that the hydrothermal conditions (16 h at 140-240 °C) are favourable for the formation of monoclinic bismuth vanadate powders. They also indicated that if samples are prepared by the route described in this paper, an increase in the grain size and a gradual decrease of the band gap occur as the hydrothermal temperature increases.

Bi8V2O17 - a stable phase in the Bi2O3-V2O5 system

Wrobel W., Krok F., Abrahams I., Kozanecka-Szmigiel A., Malys M., Chan S.C.M., Dygas J.R.

Materials Science Poland

2006

Vol. 24, No. 1

23--30

Bi8V2O17 is commonly observed as an intermediate phase in the synthesis of compounds in ternary systems of the type Bi2O3-V2O5-MexOy. It is also seen as an end product at particular compositions in these systems. A rhombohedral substructure model for this phase is presented along with electrical parameters. Evidence from the Arrhenius plot suggests a phase transition at around 550 °C. The existence of a limited solid solution of Bi8V2O17 with ZrO2 is also discussed.