Thermal expansion and index of refraction variation in barium fluoride

Autor:	D. O. Pederson, T. S. Aurora, S. M. Day, T.E. Duerr
Rok vydání:	1981
Předmět:	Chemistry Barium fluoride Analytical chemistry Mineralogy General Chemistry Derivative Conductivity Condensed Matter Physics Heat capacity Thermal expansion chemistry.chemical_compound Frenkel defect General Materials Science Refractive index Optical path length
Zdroj:	Solid State Ionics. 5:625-628
ISSN:	0167-2738
DOI:	10.1016/0167-2738(81)90332-5
Popis:	Divalent metal fluorides exhibit many anomalous properties as a result of their high anionic conductivity at temperatures characterized by a heat capacity peak at T c which occurs several hundred degrees below the melting temperature. Measurements of the thermal expansion and the temperature variation of the optical path length at 632.8 nm from 300 to 1300 K have been made on single-crystal BaF 2 . The linear thermal expansion coefficient obtained from these measurements is anomalously large near T c reflecting the influence of the Frenkel defect concentration. The temperature derivative of the index of refraction obtained from these measurements does not appear to be proportional to the thermal expansion coefficient as expected but does exhibit anomalous behavior near T c .
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0ca5b542eaff3482aebb08a205b6565a https://doi.org/10.1016/0167-2738(81)90332-5 Zobrazit plný text záznamu