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Water-vapor-induced transformation of two-dimensional vanadyl hydrogen phosphate hemihydrate, VOHPO4·0.5H2O, to one-dimensional tetrahydrate, VOHPO4·4H2O

Published online by Cambridge University Press:  01 November 2004

Soumen Dasgupta ,
Monika Agarwal  and
Arunabha Datta
Soumen Dasgupta
Affiliation:
Indian Institute of Petroleum, Dehra Dun-248005, India
Monika Agarwal
Affiliation:
Indian Institute of Petroleum, Dehra Dun-248005, India
Arunabha Datta*
Affiliation:
Indian Institute of Petroleum, Dehra Dun-248005, India
*
a)Address all correspondence to this author. e-mail: adatta@iip.res.in
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Abstract

The catalytically important, two-dimensional vanadyl hydrogen phosphate hemihydrate, VOHPO4·0.5H2O phase was transformed to the one-dimensional vanadyl hydrogen phosphate tetrahydrate, VOHPO4·4H2O for the first time by mild treatment with water vapor. It was also observed that for three samples of VOHPO4·0.5H2O prepared under different conditions, the rate of transformation to the tetrahydrate was markedly affected by morphology and crystallinity. The tetrahydrate phase could also be re-transformed to the hemihydrate by applying high vacuum or by heating at 120 °C, but this was accompanied by significant loss in crystallinity.

Keywords

Phase transformation
Type
Rapid Communications
Information
Journal of Materials Research , Volume 19 , Issue 11 , November 2004 , pp. 3131 - 3134
Copyright
Copyright © Materials Research Society 2004

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References

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