Amplitude-dependent internal friction and modulus of elasticity in single crystal of Ga2O3-Al2O3 solid solution
Kalganov D. A.1,2, Bauman D. A.1, Panov D. Yu.1, Spiridonov V. A.1, Ivanov A. Yu.1,2, Romanov A. E.1
1ITMO University, St. Petersburg, Russia
2Ioffe Institute, St. Petersburg, Russia
Email: d.a.kalganov@mail.ioffe.ru
The oscillatory deformation in single crystals of the Ga2O3-Al2O3 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 T1~134 K and T2~182 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.
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