npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2020; 70: 731-737

Published online September 29, 2020 https://doi.org/10.3938/NPSM.70.731

Copyright © New Physics: Sae Mulli.

Characterization of the $^{27}$Al NMR in a YAG (Y$_{3}$Al$_{5}$O$_{12}$) Single Crystal

Tae Ho YEOM*

Department of Laser and Optical Information Engineering, Cheongju University, Cheongju 28503, Korea

Correspondence to:thyeom@cju.ac.kr

Received: June 28, 2020; Revised: August 7, 2020; Accepted: August 7, 2020

Abstract

Nuclear magnetic resonance data of $^{27}$Al in an yttrium aluminum garnet (YAG: Y$_3$Al$_5$O$_{12}$) single crystal co-doped with V$_2$O$_5$(0.7\%) and Cr$_2$O$_3$(0.2\%) are obtained using a Fourier transform NMR spectrometer within the temperature range between 180 K ~ 410 K. The line width of the $^{27}$Al nucleus resonance line decreases with as temperature increases due to motional narrowing. The chemical shift of $^{27}$Al NMR spectra decreases as temperature increases for YAG crystal. The spin-lattice relaxation times $T_1$ of $^{27}$Al nucleus were computed as a function of temperature. The $T_1$ of $^{27}$Al nucleus in YAG single crystal increases as temperature increases. The calculated activation energy for the $^{27}$Al nucleus in YAG: V, Cr single crystal is $E_{a} = 58 \pm 3$ meV.

Keywords: YAG (Y$_{3}$Al$_{5}$O$_{12}$) single crystal, $^{27}$Al NMR, Spin-lattice relaxation time, Activation energy

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