Structure and morphology changes caused by wash treatment of tungstic acid precipitates

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Crystalline H2WO4.H2O, (WO3.2H2O) powder samples have been prepared by acidification of alkali tungstate aqueous solution. In order to decrease the alkali ion content of the precipitate from about 6×105 to 10-102 ppm, wash treatments have been applied. The influence of the wash treatment on the structure and hydration state of the solid product has been investigated by X-ray powder diffraction (XRD) and infrared absorption spectroscopy (IR). Morphology of the precipitate and the time development of the morphology during washing steps have been studied by scanning electron microscopy (SEM). The formation and transformation of an intermediate, the so-called tungstic acid C phase have been observed in the sequence of the washing steps. Reversible changes in the hydration state: WO3.2H2O↔WO3.H2O have also been observed at washing with long time interaction between crystallites and washing liquid with pH≥4.6.

Original languageEnglish
Pages (from-to)73-81
Number of pages9
JournalSolid State Ionics
Issue number1
Publication statusPublished - Sep 1 1999

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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