Nucleation behavior in the precipitation of a sparingly soluble salt - AgBr

R. Jagannathan, J. S. Wey

Research output: Contribution to journalArticle

Abstract

Nucleation behavior during the early stages of the precipitation of a sparingly soluble salt (AgBr) was studied experimentally. Direct electron microscopy and light-scattering photometry were used to determine the average diameter and the number of the AgBr nuclei. For a given reactant addition rate R, the number of AgBr nuclei increased at first, reached a maximum, and then started to decrease. The slope of the ln-ln plot of the maximum number versus R was {most positive} 1.5, indicating a bulk-diffusion growth mechanism for the AgBr nuclei. The average diameter of the nuclei was 0.008-0.015 μm, and changed with precipitation time. The supersaturation ratio S, calculated from the average nuclei diameter and the Gibbs-Thomson equation, showed the same behavior as that from a theoretical prediction. However, the calculated S values were significantly smaller than a critical value reported for the homogeneous nucleation of AgBr nuclei. These smaller S values can be explained qualitatively by a nuclei survival concept.

Original languageEnglish (US)
Pages (from-to)226-232
Number of pages7
JournalJournal of Crystal Growth
Volume73
Issue number2
DOIs
StatePublished - Nov 1985

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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