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Incorporation of O2− and OH− ions in CaF2 crystals by reaction with the surrounding atmosphere

1980; Wiley; Volume: 57; Issue: 2 Linguagem: Inglês

10.1002/pssa.2210570217

1521-396X

W. Bollmann,

Molten salt chemistry and electrochemical processes

physica status solidi (a)Volume 57, Issue 2 p. 601-607 Original Paper Incorporation of O2− and OH− ions in CaF2 crystals by reaction with the surrounding atmosphere W. Bollmann, W. Bollmann Jena, Carl-Zeiss Straße 1 Search for more papers by this author W. Bollmann, W. Bollmann Jena, Carl-Zeiss Straße 1 Search for more papers by this author First published: 16 February 1980 https://doi.org/10.1002/pssa.2210570217Citations: 12 DDR-6900 Jena, DDR. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstracten Investigations of the absorption and ionic conductivity of undoped and oxygen-containing CaF2 crystals show that an annealing in water vapour causes the presence of OH− ions whereas the content of O2− ions is low. An O2− ion is low. An O2− ion content of the crystals facilitates the OH− ion incorporation which is connected with a conversion of O2− into OH− ions. On heating the annealed crystals F− ion vacancies (F) and O2− ions are created by the reaction OH− + 2 F− ⇌ O2− + F + HF, OH− ions cause an absorption at 2.75 μm with a halfwidth of 20 cm−1. The relation between the absorption constant k(2.75 μm) and the density NOH of OH− ions is estimated to be NOH = (1 to 2) × 1018 cm−2k(2.75 μm). Abstractde Untersuchungen der Absorption und Ionenleitfähigkeit undotierter und sauerstoffhaltiger CaF2-Kristalle zeigen, daß als Folge einer Temperung in Wasserdampf OH−-Ionen, kaum aber O2−-Ionen vorliegen. Ein O2−-Gehalt der Kristalle erleichtert den OH−-Einbau und führt zur Umwandlung der O2−- in OH−-Ionen. Beim Aufheizen der getemperten Proben entstehen F−-Leerstellen (F) und O2−-Ionen durch die Reaktion OH− + 2 F− ⇌ O2− + F + HF. OH−-Ionen in CaF2 absorbieren bei 2,75 μm (Halbwertsbreite 20 cm−1). Für die Absorptionskonstante k(2,75 μm) und die Dichte NOH der OH−-Ionen wird folgende Beziehung abgeschätzt: NOH = (1 bis 2) × 1018 cm−2k(2,75 μm). References 1 H. Adler and I. Kveta, Wiener Berichte (IIa) 166, 199 (1957). 2 W. Bardsley and G. W. Green, Brit. J. appl. Phys. 6, 911 (1965). 3 W. Bollmann, Kristall und Technik 12, 941 (1977). 4 W. Bollmann, Crystal Lattice Defects 7, 139 (1977). 5 W. Bollmann, Phys. stat. sol. (a) 40, 49 (1977). 6 W. Bollmann, Phys. stat. sol. (a) 40, 409 (1977). 7 W. Bollmann and H. Henniger, Phys. stat. sol. (a) 11, 367 (1972). 8 W. Bollmann and R. Reimann, Phys. stat. sol. (a) 16, 187 (1973). 9 K. F. Burr, A. E. J. Strange, R. G. King, and L. G. Penhale, Phys. Letters A 24, 44 (1967). 10 C. R. A. Catlow, J. Phys. Chem. Solids 38, 1131 (1977). 11 V. G. Dneprova, T. N. Resukhina, and Y. I. Gerasimov, Dokl. Akad. Nauk SSSR 178, 135 (1968). 12 A. D. Franklin, J. Nonmetals 1, 27 (1972). 13 B. Joukoff, J. Primot, and C. Tallot, Mater. Res. Bull. 11, 1201 (1976). 14 H. Kojima, S. G. Whiteway, and C. R. Masson, Canad. J. Chem. 46, 2968 (1968). 15 V. Levitskii, A. Hammou, M. Duclot, and Ch. Deportes, J. Chim. phys. et Physico-Chim. biol. 73, 305 (1976). 16 H. R. Lewis, private communication; cited by M. S. Abrahams and P. G. Herkart, J. appl. Phys. 36, 274 (1965). 17 K. Recker, Z. Krist. 118, 161 (1963). 18 T. R. Reddy, E. R. Davies, J. M. Baker, D. N. Chambers, R. C. Newman, and B. Özbay, Phys. Letters A 36, 231 (1971). 19 H. Schulze and H. Gaebler, Ann. Phys. (Leipzig) 28, 37 (1972). 20 E. G. Chernevskaya, Optiko-mekh. Prom. 38, No. 2, 40 (1969). 21 E. G. Chernevskaya, Optiko-mekh. Prom. 38, No. 2, 37 (1971). 22 E. G. Chernevskaya, B. G. Stepanov, I. I. Figurnov, and A. V. Lovkov, Optiko-mekh. Prom. 40, No. 3, 69 (1973). Citing Literature Volume57, Issue216 February 1980Pages 601-607 ReferencesRelatedInformation