Single‐crystal elastic constants of MgF2in the temperature range 4.2–300 K

Autor:	J. D. Greiner, H. M. Kandil, J. F. Smith, A. C. Ayers
Rok vydání:	1981
Předmět:	Chemistry General Physics and Astronomy Thermodynamics Crystal structure Atmospheric temperature range Tetragonal crystal system symbols.namesake Crystallography Normal mode symbols Negative temperature Anisotropy Single crystal Debye model
Zdroj:	Journal of Applied Physics. 52:759-763
ISSN:	1089-7550 0021-8979
Popis:	The six independent elastic constants of single crystals of tetragonal MgF2 have been measured over the temperature range 4.2–300 K. All six of the conventional constants show normal negative temperature dependences. The shear constants associated with normal modes of deformation tend to be weak, and one of these, (1)/(2) (C11−C12), also exhibits a weak positive temperature dependence as do all other fluorides with the rutile structure for which data are available. The data indicate a high degree of anisotropy in the atomic force interactions. A Debye temperature evaluated from the single‐crystal elastic constants when combined with two empirical Einstein temperatures satisfactorily describes tabulated heat‐capacity data to within 1%.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ae19f59ccd319f9b87403a2660e28801 https://doi.org/10.1063/1.328759 Zobrazit plný text záznamu