Open AccessОб изотропных точках в примесных кристаллах K-=SUB=-2-=/SUB=-SO-=SUB=-4-=/SUB=-
Author(s) -
В.И. Стадник,
Р.Б. Матвиив,
Р.С. Брезвин,
П.А. Щепанский,
З.А. Когут
Publication year - 2021
Publication title -
optika i spektroskopiâ
Language(s) - English
Resource type - Journals
eISSN - 2782-6694
pISSN - 0030-4034
DOI - 10.21883/os.2021.02.50556.130-20
Subject(s) - birefringence , isotropy , crystal (programming language) , impurity , potassium , doping , materials science , analytical chemistry (journal) , chemistry , optics , metallurgy , physics , optoelectronics , organic chemistry , chromatography , computer science , programming language
The temperature, spectral and pressure dependences of the birefringence Δni of potassium sulfate crystals doped with 1.7% of copper have been studied. The introduction of the impurity is found to change the absolute value of Δni and lead to an increase in the temperature dependence of Δnі(Т). It is shown that the isotropic points appear in the doped crystal of potassium sulfate, and are shifted, compared with a pure crystal, towards low temperatures by 5 K and 11 K, respectively. It was established, that uniaxial stresses change the magnitude of the Δni absolute values, as well as the region of existence of the isotropic state. Generalized temperature-spectral-baric diagrams of the isotropic state of doped potassium sulfate crystal are constructed, making it possible to use them as a crystal-optical sensor.