Optical Study of Excitions in Mixed Alkali Halides: Ki-kbr

Optical Study of Excitions in Mixed Alkali Halides: Ki-kbr
Author: Hung Kuen Alan Kan
Publisher:
Total Pages: 100
Release: 1966
Genre:
ISBN:

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The absorption and luminescence properties of KI-KBr mixed crystals were studied over a wide range of KI concentrations. In all systems an absorption band was found which was attributed to a localized exciton formed at an I- - site. The position of the band shifts toward the first exciton absorption peak of pure KI with increasing I- concentration. For dilute I--concentrations the width of the band is twice as large as the width of pure KI or the 82 mole% KI sample. It was also found that the low photon energy absorption edge of this band was an exponential function of photon energy (Urbach's rule) in all mixtures. All the KI-KBr mixed crystals showed a strong luminescence at 80K when excited in the exciton absorption band. In all cases two emission bands were observed. The existence of Urbach's rule and occurrence of two emission bands in these mixed-halide crystals is compared with the similar behavior of pure alkali halides. (Author).

Physics Briefs

Physics Briefs
Author:
Publisher:
Total Pages: 820
Release: 1992
Genre: Physics
ISBN:

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Concise Encyclopedia of Advanced Ceramic Materials

Concise Encyclopedia of Advanced Ceramic Materials
Author: R.J. Brook
Publisher: Elsevier
Total Pages: 605
Release: 2012-12-02
Genre: Technology & Engineering
ISBN: 0080983707

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Advanced ceramics cover a wide range of materials which are ceramic by nature but have been developed in response to specific requirements. This encyclopedia collects together 137 articles in order to provide an up-to-date account of the advanced ceramic field. Some articles are drawn from the acclaimed Encyclopedia of Materials Science and Engineering, often revised, and others have been newly commissioned. The Concise Encyclopedia of Advanced Ceramic Materials aims to provide a comprehensive selection of accessible articles which act as an authoritative guide to the subject. The format is designed to help the readers form opinions on a particular subject. Arranged alphabetically, with a broad subject range, the articles are diverse in character and style, thereby stimulating further discussion. Topics covered include survey articles on glass, hot pressing, insulators, powders, and many are concerned with specific chemical systems and their origins, processing and applications. The Concise Encyclopedia of Advanced Ceramic Materials will be invaluable to materials scientists, researchers, educators and industrialists working in technical ceramics.

Government Reports Annual Index

Government Reports Annual Index
Author:
Publisher:
Total Pages: 446
Release: 1966
Genre: Government reports announcements & index
ISBN:

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