Energetics of bismuth vanadate

G. P. Nagabhushana, A. H. Tavakoli, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Bismuth vanadate has gained considerable interest as a photoanode for water splitting reactions under visible light. It exists in four different polymorphs, out of which three of them have been synthesized. Thermodynamic properties of these three polymorphs are investigated using high temperature oxide melt solution calorimetry. The monoclinic scheelite phase which exhibits photocatalytic activity under visible light is found to be the most stable polymorph, followed by tetragonal scheelite which exhibits activity under UV light. The photocatalytically inactive tetragonal zircon form is found to be the least stable polymorph. The small difference in enthalpy of formation between the two scheelite structures (-8 kJ/mol) is in accord with the reversibility of the transformation between them and the larger difference between the most stable monoclinic phase and the least stable tetragonal zircon phase (-23 kJ/mol) is in accord with the irreversible (monoclinic-tetragonal zircon) phase transformation.

Original languageEnglish (US)
Pages (from-to)187-192
Number of pages6
JournalJournal of Solid State Chemistry
Volume225
DOIs
StatePublished - May 2015
Externally publishedYes

Keywords

  • Photocatalysis
  • Polymorphism
  • Stability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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