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Gyrotropic properties and birefringence of Sm x Tb 1−x FeO 3 in spin reorientation range
Author(s) -
Sirota N. N.,
Lomako I. D.
Publication year - 1979
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19790140217
Subject(s) - birefringence , polar , atmospheric temperature range , condensed matter physics , materials science , lattice (music) , absorption (acoustics) , chemistry , crystallography , optics , physics , thermodynamics , astronomy , acoustics , composite material
The polar diagrams of the Sm x Tb 1−x FeO 3 system taken for the crystallographic directions [110] and [001] have been investigated. The gyrotropic measurements data are compared to the values of the bond angles θ 1 and θ 2 calculated in terms of the lattice parameters. The correlation between the crystallographic and optical properties change as a function of composition has been obtained for the system under investigation. ‐The temperature measurements of the gyrotropic properties of SmFeO 3 and Sm 0.8 Tb 0.2 FeO 3 have shown that with temperature rising a change of shape and character of the polar diagrams takes place. The birefringence temperature dependence for Sm 0.8 Tb 0.2 FeO 3 in the transparency and absorption range has been determined. The results of the study show the existence of the interrelation between the crystallographic, optical and magnetic characteristics and indicate that the temperature range of spin reorientation can be reliably determined from the optical measurements.