Twinned silver bromide crystals. Some insights into their formation and growth

Research output: Contribution to journalArticle

Abstract

Growth rate of octahedral silver bromide crystals is controlled by the rate of incorporation of growth species at the 〈111〉 surface when the [Br-] in the reactor is increased to levels where the tabular AgBr crystals are precipitated. Under these conditions, the supersaturation at the 〈111〉 surface is equivalent to the bulk solution supersaturation. It is suggested that during the nucleation stage of AgBr precipitation, when the bulk and, therefore, the surface supersaturation are high, the 〈111〉 surface becomes unstable because of the high rate of addition of growth species. This instability results in the twinning of octahedral crystals; subsequent formation of crystals with two parallel twin planes and the enhanced growth rate at the reentrant region of these crystals lowers the solution supersaturation and brings the system back to stability. This concept of surface-supersaturation-induced twinning was validated by our experiments in which 〈111〉 surfaces were twinned by exposing them to high supersaturation.

Original languageEnglish (US)
Pages (from-to)104-112
Number of pages9
JournalJournal of Imaging Science
Volume35
Issue number2
StatePublished - Mar 1 1991

Fingerprint

Supersaturation
Silver
Crystals
Twinning
Nucleation
Experiments

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Twinned silver bromide crystals. Some insights into their formation and growth. / Jagannathan, Ramesh.

In: Journal of Imaging Science, Vol. 35, No. 2, 01.03.1991, p. 104-112.

Research output: Contribution to journalArticle

@article{dad1e843748c492aa8639e0de1a9824a,
title = "Twinned silver bromide crystals. Some insights into their formation and growth",
abstract = "Growth rate of octahedral silver bromide crystals is controlled by the rate of incorporation of growth species at the 〈111〉 surface when the [Br-] in the reactor is increased to levels where the tabular AgBr crystals are precipitated. Under these conditions, the supersaturation at the 〈111〉 surface is equivalent to the bulk solution supersaturation. It is suggested that during the nucleation stage of AgBr precipitation, when the bulk and, therefore, the surface supersaturation are high, the 〈111〉 surface becomes unstable because of the high rate of addition of growth species. This instability results in the twinning of octahedral crystals; subsequent formation of crystals with two parallel twin planes and the enhanced growth rate at the reentrant region of these crystals lowers the solution supersaturation and brings the system back to stability. This concept of surface-supersaturation-induced twinning was validated by our experiments in which 〈111〉 surfaces were twinned by exposing them to high supersaturation.",
author = "Ramesh Jagannathan",
year = "1991",
month = "3",
day = "1",
language = "English (US)",
volume = "35",
pages = "104--112",
journal = "Journal of Imaging Science",
issn = "8750-9237",
publisher = "Society for Imaging Science and Technology",
number = "2",

}

TY - JOUR

T1 - Twinned silver bromide crystals. Some insights into their formation and growth

AU - Jagannathan, Ramesh

PY - 1991/3/1

Y1 - 1991/3/1

N2 - Growth rate of octahedral silver bromide crystals is controlled by the rate of incorporation of growth species at the 〈111〉 surface when the [Br-] in the reactor is increased to levels where the tabular AgBr crystals are precipitated. Under these conditions, the supersaturation at the 〈111〉 surface is equivalent to the bulk solution supersaturation. It is suggested that during the nucleation stage of AgBr precipitation, when the bulk and, therefore, the surface supersaturation are high, the 〈111〉 surface becomes unstable because of the high rate of addition of growth species. This instability results in the twinning of octahedral crystals; subsequent formation of crystals with two parallel twin planes and the enhanced growth rate at the reentrant region of these crystals lowers the solution supersaturation and brings the system back to stability. This concept of surface-supersaturation-induced twinning was validated by our experiments in which 〈111〉 surfaces were twinned by exposing them to high supersaturation.

AB - Growth rate of octahedral silver bromide crystals is controlled by the rate of incorporation of growth species at the 〈111〉 surface when the [Br-] in the reactor is increased to levels where the tabular AgBr crystals are precipitated. Under these conditions, the supersaturation at the 〈111〉 surface is equivalent to the bulk solution supersaturation. It is suggested that during the nucleation stage of AgBr precipitation, when the bulk and, therefore, the surface supersaturation are high, the 〈111〉 surface becomes unstable because of the high rate of addition of growth species. This instability results in the twinning of octahedral crystals; subsequent formation of crystals with two parallel twin planes and the enhanced growth rate at the reentrant region of these crystals lowers the solution supersaturation and brings the system back to stability. This concept of surface-supersaturation-induced twinning was validated by our experiments in which 〈111〉 surfaces were twinned by exposing them to high supersaturation.

UR - http://www.scopus.com/inward/record.url?scp=0026120451&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026120451&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0026120451

VL - 35

SP - 104

EP - 112

JO - Journal of Imaging Science

JF - Journal of Imaging Science

SN - 8750-9237

IS - 2

ER -