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Number of results
2010 | 117 | 1 | 129-132

Article title

Temperature-and-Spectral Deformations of the Optical Indicatrix of Rubidium Sulphate Single Crystal

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Content

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Languages of publication

EN

Abstracts

EN
The paper deals with newly investigated temperature-and-spectrum dependences of principal birefringences (Δ n_{i}(λ,T)-i=X, Y, Z; λ=250÷850 nm; T = 4.2-1100 K), and temperature dependence of the optic-axial angle (2V(T) - T=4.2-1100 K) for two laser lines 632.8 nm and 441.1 nm of Rb_{2}SO_{4} crystals. Based on the temperature dependence of the optic-axial angle, the second point of birefringence sign inversion has been found. Newly obtained is the temperature-and-spectrum diagram of the uniaxial state of the optical indicatrix at the "isotropic points" and in the hexagonal phase of Rb_{2}SO_{4}. Based on the temperature behavior of the birefringence and optic-axial angle it was supposed that hexagonal-orthorhombic phase transition in rubidium sulfate can be a second-order phase transition. Found is the inversion of birefringence dispersion in the X and Y directions at 400 K and 620 K, respectively.

Keywords

EN

Contributors

author
  • Lviv Polytechnic National University, 12 Bandera St., 79013 Lviv, Ukraine

References

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  • 2. M. Miyake, S. Iwai, Phys. Chem. Minerals 7, 211 (1981)
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  • 4. I.S. Zheludev, V.M. Gaba, N.A. Romanyuk, Z.M. Ursul, Izv. AN SSSR, Ser. Fiz. 50, 386 (1986) (in Russian)
  • 5. N.A. Romanyuk, V.M. Gaba, Z.M. Ursul, V.I. Stadnyk, Opt. Spektroskopiya 62, 94 (1987) (in Russian)
  • 6. M. Miyake, I. Minato, S. Iwai, Phys. Chem. Minerals 4, 307 (1979)
  • 7. L. Vinchell, G. Vinchell, Optical Properties of Artificial Minerals, Mir, Moscow 1967 (in Russian)
  • 8. R.W.G. Wyckoff, Crystal Structures, Interscience Publ., New York 1960
  • 9. V.M. Gaba, N.A. Romanyuk, A.V. Franiv, Ukr. J. Phys. 27, 333 (1982)
  • 10. F. El-Kabbany, Y. Badr, N.H. Taher, S. Taha, Appl. Phys. Commun. 6, 313 (1986-1987)

Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.bwnjournal-article-appv117z123kz
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