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On Isotropic Points in Potassium Ammonium Sulphate Crystals

  • PHYSICAL PROPERTIES OF CRYSTALS
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Abstract

An effect of uniaxial pressure on the spectral and temperature dependences of birefringence of K1.75[NH4]0.25SO4 single crystals has been studied. Different changes in the birefringence are found for different compression directions. The possibility of the occurrence of isotropic points in the crystal under uniaxial compression is discussed. A decrease in the birefringence under crystal heating is established, and the positions of two isotropic points in the range of 290–630 K are determined. The partial isomorphic substitution of NH4 ions for K ions was found to result in a shift of isotropic points to lower temperatures.

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Funding

The study was supported by the State Fund for Fundamental Research of Ukraine (project no. Ф73/101-2016) and the Research Project “Young Scientists 2017” of the Jan Dlugosz University in Czestochowa, grants DSM/WMP/5542/2017 (P.A. Shchepanskyi) and DSM/WMP/5536/2017 (M.Ya. Rudysh).

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Authors and Affiliations

  1. Ivan Franko Lviv National University, 79005, Lviv, Ukraine

    V. Yo. Stadnyk, P. A. Shchepanskyi, R. S. Brezvin & M. Ya. Rudysh

  2. Jan Dlugosz University in Czestochowa, 42-200, Czestochowa, Poland

    P. A. Shchepanskyi & M. Ya. Rudysh

  3. Lviv Polytechnic National University, 79013, Lviv, Ukraine

    Z. A. Kohut

  4. Ukranian National Forestry University, 79057, Lviv, Ukraine

    O. R. Onufriv

  5. Karpenko Physico–Mechanical Institute of the National Academy of Sciences of Ukraine, 79060, Lviv, Ukraine

    Ya. P. Kost

Authors
  1. V. Yo. Stadnyk
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  2. P. A. Shchepanskyi
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  3. R. S. Brezvin
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  4. M. Ya. Rudysh
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  5. Z. A. Kohut
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  6. O. R. Onufriv
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  7. Ya. P. Kost
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Corresponding authors

Correspondence to V. Yo. Stadnyk or P. A. Shchepanskyi.

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Translated by A. Zolot’ko

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Stadnyk, V.Y., Shchepanskyi, P.A., Brezvin, R.S. et al. On Isotropic Points in Potassium Ammonium Sulphate Crystals. Crystallogr. Rep. 64, 787–792 (2019). https://doi.org/10.1134/S1063774519050201

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  • DOI: https://doi.org/10.1134/S1063774519050201

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