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Dilatometric and ultrasound study of [NH2(CH3)2]MnCl3 · 2H2O crystals

  • Physical Properties of Crystals
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Abstract

The unit-cell parameters of [NH2(CH3)2]MnCl3 · 2H2O crystals are determined by X-ray diffraction analysis and the velocities of longitudinal ultrasonic waves in these crystals are measured by the echo-pulse method in the temperature range 100–315 K. The coefficients of thermal expansion along the principal crystallographic axes are derived from the temperature dependences of the unit-cell parameters. The temperature dependences of the characteristics studied reveal kink anomalies at temperatures of ∼125, 179, 203, 260, and 303 K. These anomalies are indicative of structural transformations in the [NH2(CH3)2]MnCl3 · 2H2O crystals, which may be related to the dynamics of dimethylammonium cations.

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Authors and Affiliations

  1. Institute of Solid-State and Semiconductor Physics, Belarussian Academy of Sciences, ul. Brovki 17, Minsk, 220072, Belarus

    A. U. Sheleg, E. M. Zub & A. Ya. Yachkovskii

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

    L. F. Kirpichnikova

Authors
  1. A. U. Sheleg
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  2. E. M. Zub
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  3. A. Ya. Yachkovskii
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  4. L. F. Kirpichnikova
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__________

Translated from Kristallografiya, Vol. 50, No. 6, 2005, pp. 1026–1030.

Original Russian Text Copyright © 2005 by Sheleg, Zub, Yachkovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\), Kirpichnikova.

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Sheleg, A.U., Zub, E.M., Yachkovskii, A.Y. et al. Dilatometric and ultrasound study of [NH2(CH3)2]MnCl3 · 2H2O crystals. Crystallogr. Rep. 50, 949–953 (2005). https://doi.org/10.1134/1.2132401

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  • DOI: https://doi.org/10.1134/1.2132401

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