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Heat Capacity and Features of the Phonon Spectrum of Single Crystals of Solid Solutions of Yttrium-Lutetium Alumogranates

Year: 2024

Type: article

Abstract: The temperature dependences of the heat capacity were measured and the general patterns of the formation of the phonon spectrum of single crystals of solid solutions of yttrium-lutetium aluminum garnets Y3–xLuxAl5O12 at 0 x 3 were studied in the temperature range from 1.9 to 220 K. Based on the data obtained below 10 K, the Debye temperatures were calculated. Features of the phonon spectrum in the intermediate temperature region are interpreted as a superposition of optical modes for yttrium and lutetium garnets. It is shown that low values of the heat capacity due to the contribution of acoustic phonons for Y2.25Lu0.75Al5O12 correlate with anomalies in the concentration dependences of phonon transport, absorption of acoustic waves, and the NMR line shape of aluminum.

Source: Акустический журнал

DOI: 10.31857/s0320791924020053

Authors: S. A. Nikitov, A. V. Taranov, E. N. Khazanov, E. V. Charnaya, M. V. Likholetova, E. V. Shevchenko

Institutions: Russian Academy of Sciences, Kotelnikov Institute of Radioengineering and Electronics of the Russian Academy of Sciences, St Petersburg University

Language: English

Topic: Thermal Expansion and Ionic Conductivity

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: bronze

OpenAlex ID: W4401610090

FWCI:

Cites: 15

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Related to: 10