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Growth of MgF2 optical crystals and their ionic conductivity in the as-grown state and after partial pyrohydrolysis

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Abstract

MgF2 single crystals have been grown from melt by the Bridgman technique in a fluorinating atmosphere. To control the presence of oxygen impurity, it was first suggested to measure the ionic conductivity in MgF2 crystals by impedance spectroscopy. The characteristics of ionic conductivity of “as grown” (i.e., without thermal treatment) crystals and crystals obtained by commercial vacuum technology practically coincide: the volume conductivity σv = 1.4 × 10−7 S/cm at 773 K and the ion-transport activation energy E a = 1.40 ± 0.05 eV. Annealing MgF2 crystals during electrophysical studies upon heating from 293 to 823 K in vacuum (residual pressure ∼1 Pa) for 4 h led to their partial pyrohydrolisis. The influence of this thermal treatment of MgF2 crystals on their optical transmission is studied in the wavelength range of 115–300 nm.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    D. N. Karimov, N. I. Sorokin & B. P. Sobolev

  2. Faculty of Physics, Moscow State University, Moscow, Russia

    S. P. Chernov

Authors
  1. D. N. Karimov
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  2. N. I. Sorokin
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  3. S. P. Chernov
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  4. B. P. Sobolev
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Correspondence to N. I. Sorokin.

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Dedicated to the International Year of Crystallography

Original Russian Text © D.N. Karimov, N.I. Sorokin, S.P. Chernov, B.P. Sobolev, 2014, published in Kristallografiya, 2014, Vol. 59, No. 6, pp. 1020–1024.

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Karimov, D.N., Sorokin, N.I., Chernov, S.P. et al. Growth of MgF2 optical crystals and their ionic conductivity in the as-grown state and after partial pyrohydrolysis. Crystallogr. Rep. 59, 928–932 (2014). https://doi.org/10.1134/S1063774514060133

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  • DOI: https://doi.org/10.1134/S1063774514060133

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