Structural modifications of dodecatungstophosphoric acid hexahydrate induced by temperature in the 10-358 K range. In situ high-resolution neutron powder diffraction investigation
AuthorsKremenović, Aleksandar S.
Davidović, Milorad P.
MetadataShow full item record
Dodecatungstophosphoric acid hexahydrate H3PW12O40.6H(2)O crystal structure has been investigated by neutron powder diffraction (NPD) at different temperatures in the 10-358 K range. A nonconvergent reversible phase transition has been noticed at about 320 K. This transition is associated with a change in dynamic equilibrium of hydrate species and partial reduction/oxidation (redox) W6+ LT ---- GT (5+). Expressive structure changes lie in the P-O bonding inside Keggins anion and the H5O2+ conformational angle. (C) 2002 Published by Elsevier Science B.V.