Resonance ultrasound attenuation in the doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeF</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>superionic crystal

Acousto-optical studies of temperature and frequency dependences of ultrasound attenuation in the doped ${\mathrm{CeF}}_{3}$ crystal with high fluorine conductivity revealed resonance peaks that shifted to high temperature with increasing ultrasound frequency above room temperature. The temperatures of the attenuation maximums were found to depend linearly on the squared frequency of the ultrasonic waves. The resonance phenomena observed were treated within the framework of the Landau phenomenological theory under the assumption that a superionic phase transition occurs at about 325 K. The studies of electrical conductance and ${}^{19}\mathrm{F}$ nuclear magnetic resonance were carried out to confirm such assumption.

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