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首页> 外文期刊>Physica, B. Condensed Matter >EPR and ENDOR study of an oxygen-vacancy-associated Ti3+ center in RbTiOPO4 crystals
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EPR and ENDOR study of an oxygen-vacancy-associated Ti3+ center in RbTiOPO4 crystals

机译:Eb和ENDOR研究RbTiOPO4晶体中与氧空位相关的Ti3 +中心

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The dominant Ti3+ trapped electron center in flux-grown RbTiOPO4 (RTP) crystals has been characterized using electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR). This center is produced during an X-ray irradiation at room temperature when a Ti4+ ion traps an electron and becomes a Ti3+ ion, and is best studied in the 30-40K range. The EPR spectrum contains a three-line hyperfine pattern from two nearly equivalent neighboring P-31 nuclei, along with hyperfine lines from the Ti-47 and Ti-49 nuclei. The g matrix, determined from the angular dependence of the EPR spectrum, has principal values of 1.819, 1.889, and 1.947. Hyperfine matrices for four P-31 nuclei are obtained from the angular dependence of the ENDOR spectrum. The proposed model for this defect is a Ti3+ ion adjacent to an oxygen vacancy at an OT position. Analogies are made to a similar Ti3+ center in KTiOPO4 (KTP) crystals. (C) 2007 Elsevier B.V. All rights reserved.
机译:使用电子顺磁共振(EPR)和电子核双共振(ENDOR)对通量增长的RbTiOPO4(RTP)晶体中占主导的Ti3 +俘获的电子中心进行了表征。当Ti4 +离子俘获电子并变成Ti3 +离子时,在室温下X射线照射期间会产生该中心,最好在30-40K范围内进行研究。 EPR谱包含来自两个几乎相等的相邻P-31核的三线超精细图谱,以及来自Ti-47和Ti-49核的超细谱线。根据EPR频谱的角度依赖性确定的g矩阵的主值分别为1.819、1.889和1.947。从ENDOR光谱的角度依赖性获得了四个P-31核的超精细矩阵。针对该缺陷提出的模型是与OT位置的氧空位相邻的Ti3 +离子。对KTiOPO4(KTP)晶体中类似的Ti3 +中心进行了类推。 (C)2007 Elsevier B.V.保留所有权利。

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