Anti-Site Defects and Trigonal Center of Holmium in Y3Al5O12:Ho3+ Crystal According to the Results of Wideband EPR Spectroscopy

IF 1 Q4 OPTICS

Optical Memory and Neural Networks Pub Date : 2023-12-01 DOI:10.3103/s1060992x23070044

引用次数: 0

Abstract

EPR spectra of Ho³⁺ impurity ions were recorded in single crystals of yttrium aluminum garnet (Y₃Al₅O₁₂, YAG) in the frequency range of 114–410 GHz, at a temperature of 4.2 K. Besides the centers due to unusual substitutions by Y³⁺ for Al³⁺ ions (anti-site defects), a trigonal center was found, which indicates the replacement of Al³⁺ ions by Ho³⁺ ions in octahedral positions with local symmetry C_3i. The magnitude of g-factor, the hyperfine structure constant and the energy interval between the main and the first excited sublevel of the main ⁵I₈ muliplet were determined. A comparative analysis of the formation of satellite centers for crystals grown under different conditions is made.

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宽带 EPR 光谱结果显示 Y3Al5O12:Ho3+ 晶体中的反位缺陷和钬的三正交中心

摘要在温度为 4.2 K 的钇铝石榴石（Y3Al5O12，YAG）单晶中记录了频率范围为 114-410 GHz 的 Ho3+ 杂质离子的 EPR 光谱。除了由于 Y3+ 对 Al3+ 离子的不寻常置换（反位缺陷）而产生的中心外，还发现了一个三棱中心，表明在局部对称性为 C3i 的八面体位置上由 Ho3+ 离子置换了 Al3+ 离子。测定了 g 因子的大小、超频结构常数以及主 5I8 子级的主级和第一个激发子级之间的能量间隔。对在不同条件下生长的晶体形成卫星中心的情况进行了比较分析。

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来源期刊

Optical Memory and Neural Networks OPTICS-

CiteScore

1.50

自引率

11.10%

发文量

期刊介绍： The journal covers a wide range of issues in information optics such as optical memory, mechanisms for optical data recording and processing, photosensitive materials, optical, optoelectronic and holographic nanostructures, and many other related topics. Papers on memory systems using holographic and biological structures and concepts of brain operation are also included. The journal pays particular attention to research in the field of neural net systems that may lead to a new generation of computional technologies by endowing them with intelligence.