Crystallization of Silver Chromate from Ethanol Via Salt Metathesis Reactions of Solubilized Precursors

Abstract

Admixture of aqueous solutions of silver nitrate and potassium chromate results in immediate precipitation of silver chromate as a red-brown microcrystalline powder, while addition of aqueous silver nitrate solution to a solution of potassium chromate/18-crown-6 in ethanol gives a bright-red precipitate. X-ray powder diffraction shows both materials to be orthorhombic silver chromate. The ethanol-derived sample displays broader diffraction peaks, suggesting smaller crystallite size. Scanning electron microscopy confirms this. The ethanol-derived sample appears amorphous, while the aqueous sample displays well-faceted crystallites approximately 0.5 - 1 micron in size. Nonaqueous crystallization, Complexation-mediated crystallization.

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Document Details

Document Type
Technical Report
Publication Date
Oct 14, 1993
Accession Number
ADA275178

Entities

People

  • Kenneth M. Doxsee

Organizations

  • University of Oregon

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Aqueous Solutions
  • Chemistry
  • Crystallites
  • Crystallization
  • Diffraction
  • Electron Microscopy
  • Electrons
  • Exchange Reactions
  • Materials
  • Microscopy
  • Potassium
  • Precipitation
  • Precursors
  • Scanning Electron Microscopy
  • Silver Compounds
  • X Rays

Readers

  • Materials Science and Engineering.
  • Organic Chemistry
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics