Effect of proton irradiation on optical properties and defect formation in crystals Gd3AlxGa5–xO12 (x = 2, 3)

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Abstract

The influence of proton irradiation with a dose of 50 Mrad (Si) on the optical properties and defect formation in crystals of the gadolinium-aluminum-gallium garnet with the substitution of aluminumand gallium in the cationic sublattice: Gd3Al2Ga3O12 (Al: Ga = 2:3) and Gd3Al3Ga2O12 (Al: Ga = 3:2) was studied. After proton irradiation, color of crystals changes: an additional absorption band appears in the transmittance of each crystal in the wavelength range 400–500 nm. This occures due to the formation of induced structural defects as color centers. The refractive indices n(λ) were determined by the Brewster spectrophotometric method and practically did not change for Al:Ga = 2:3 crystals, but significantly increased for Al:Ga = 3:2. There is a noticeable increase in the attenuation of the light in spectral dependences, which also indicates the formation of additional structural defects.

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About the authors

V. M. Kasimova

National University of Science and Technology "MISIS"

Author for correspondence.
Email: kasimovavalya@mail.ru
Russian Federation, 119049, Moscow

N. S. Kozlova

National University of Science and Technology "MISIS"

Email: kasimova.vm@misis.ru
Russian Federation, 119049, Moscow

E. V. Zabelina

National University of Science and Technology "MISIS"

Email: kasimovavalya@mail.ru
Russian Federation, 119049, Moscow

O. A. Buzanov

JSC FOMOS-MATERIALS

Email: kasimovavalya@mail.ru
Russian Federation, 107023, Moscow

P. B. Lagov

National University of Science and Technology "MISIS"; Institute of Physical Chemistry and Electrochemistry RAS

Email: kasimovavalya@mail.ru
Russian Federation, 119049, Moscow; 119071, Moscow

Yu. S. Pavlov

Institute of Physical Chemistry and Electrochemistry RAS

Email: kasimovavalya@mail.ru
Russian Federation, 119071, Moscow

T. V. Kulevoy

Kurchatov Complex for Theoretical and Experimental Physics NRC “Kurchatov Institute”

Email: kasimovavalya@mail.ru
Russian Federation, 117218, Moscow

V. S. Stolbunov

Kurchatov Complex for Theoretical and Experimental Physics NRC “Kurchatov Institute”

Email: kasimovavalya@mail.ru
Russian Federation, 117218, Moscow

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Supplementary files

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2. Fig. 1. The appearance of the studied crystals Gd3Al2Ga3O12 (a) and Gd3Al3Ga2O12 (b) before and after proton irradiation.

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3. Fig. 2. Spectral dependences of the transmission coefficients of Gd3Al2Ga3O12 (1, 2) and Gd3Al3Ga2O12 (3, 4) crystals before (1, 3) and after (2, 4) proton irradiation. The insert shows an approximate section of the transmission coefficient spectra in the wavelength range of 300-700 nm.

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4. Fig. 3. Dispersion dependences of the refractive coefficients of Gd3Al2Ga3O12 (1, 2) and Gd3Al3Ga2O12 (3, 4) crystals before (1, 3) and after (2, 4) proton irradiation.

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5. Fig. 4. Spectral dependences of the attenuation indices of Gd3Al2Ga3O12 (1, 2) and Gd3Al3Ga2O12 (3, 4) crystals before (1, 3) and after (2, 4) proton irradiation. The insert shows an approximate section of the spectra of attenuation indicators in the wavelength range 350-700 nm.

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