Mechanical properties, strength and ductility

Amplitude-dependent internal friction and modulus of elasticity in single crystal of Ga$_2$O$_3$–Al$_2$O$_3$ solid solution

D. A. Kalganov^ab, D. A. Bauman^a, D. Yu. Panov^a, V. A. Spiridonov^a, A. Yu. Ivanov^ab, A. E. Romanov<sup>a

a</sup> St. Petersburg National Research University of Information Technologies, Mechanics and Optics
^b Ioffe Institute, St. Petersburg

Abstract: The oscillatory deformation in single crystals of the Ga$_2$O$_3$–Al$_2$O$_3$ solid solution was investigated using the composite piezoelectric oscillator method. The amplitude and temperature dependencies of the damping decrement and the modulus of elasticity were obtained. The presence of amplitude-dependent internal friction, associated with the microplasticity effect in the material under study, was demonstrated. Thermoactivated relaxation effects of elastic oscillations were observed in the studied material at low temperatures $T_1\approx$ 134 K and $T_2\approx$ 182 K. It was established that aluminum ions in the studied solid solutions form diffusion fields for mobile dislocations and determine the features of the amplitude-dependent internal friction.

Keywords: internal friction, modulus of elasticity, microplasticity, composite piezoelectric oscillator, gallium oxide, defects.

Received: 02.10.2025
Revised: 02.10.2025
Accepted: 04.10.2025

DOI: 10.61011/FTT.2025.10.61983.269-25

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