PREPARATION AND STUDY OF EPITAXIAL AGCL AGBR(I) CUBIC GRAINS

Citation
Ym. Wang et al., PREPARATION AND STUDY OF EPITAXIAL AGCL AGBR(I) CUBIC GRAINS, Journal of Photographic Science, 42(1), 1994, pp. 10-13
Citations number
17
Categorie Soggetti
Photographic Tecnology
ISSN journal
00223638
Volume
42
Issue
1
Year of publication
1994
Pages
10 - 13
Database
ISI
SICI code
0022-3638(1994)42:1<10:PASOEA>2.0.ZU;2-8
Abstract
Three AgCl/AgBr(I) cubic emulsion grains were prepared successfully by epitaxial deposition of AgCl on (111) surfaces of three cubo-octahedr al AgBr(I) host grains made at various pAg values by a microcomputer-c ontrolled, balanced, double-jet method. Using powder X-ray diffractome try, the component phases of these epitaxial emulsion grains were iden tified, corresponding to the host AgBr(I) phase and a new AgCl phase, respectively. The dielectric loss curves of epitaxial grains showed tw o separated peaks, corresponding to the contribution of the AgBr(I) ho st phase and epitaxial AgCl to ionic conductivity, respectively. The p hotoconductivity decay process for both host and epitaxial grains was composed of slower and faster parts, each of which obeys first-order k inetics. The epitaxial procedure modified effectively the amount and m ean lifetime of photoelectrons. The photosensitivities of epitaxial em ulsions were much higher than those of the host emulsions, which can b e attributed to the epitaxial growth benefiting the formation of conce ntrated latent image.