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首页> 外文期刊>Applied Magnetic Resonance >EPR Study of Cr3+ and Fe3+ Impurity Ions in Nominally Pure and Co2+-Doped YAlO3 Single Crystals
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EPR Study of Cr3+ and Fe3+ Impurity Ions in Nominally Pure and Co2+-Doped YAlO3 Single Crystals

机译：EPR研究名义纯和掺杂Co2 +的YAlO3单晶中的Cr3 +和Fe3 +杂质离子

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摘要

In this paper, we report electron paramagnetic resonance (EPR) measurements of YAlO3 (YAP) single crystals and their preliminary theoretical analysis. Two kinds of the as-grown and annealed (in reducing N-2 plus H-2 atmosphere at 1100 K) YAP samples, nominally pure and doped with Co2+ ions, were studied. The presence of small amounts of Cr3+ and Fe3+ paramagnetic centers is revealed from the observed EPR spectral lines. In the annealed crystals, a decrease in the line intensity for Fe3+ ions and a simultaneous increase for Cr3+ ions is observed. Interestingly, a gradual decrease in intensity of both the Cr3+ and Fe3+ lines down to zero has been observed in EPR spectra below 80 K. The aim of this paper, first in the series of investigations, is to unravel characteristics of unintentional impurities present in nominally pure YAP crystals as indicated by EPR measurements. For this purpose, the spin Hamiltonian analysis of EPR spectra has been carried out on the basis of the triclinic (C (i) ) site symmetry. The fitted spin Hamiltonian parameters for Cr3+ and Fe3+ ions, i.e., zero-field splitting parameters and the Zeeman electronic tensor components, agree well with literature data. More detailed analysis of low symmetry aspects involved in EPR studies based on superposition model will be provided elsewhere.
机译：在本文中，我们报告了YAlO3（YAP）单晶的电子顺磁共振（EPR）测量及其初步理论分析。研究了两种刚生长和退火过的（在1100 K下在还原N-2和H-2气氛中）YAP样品，它们名义上是纯净的，并掺有Co2 +离子。从观察到的EPR谱线可以看出存在少量Cr3 +和Fe3 +顺磁中心。在退火晶体中，观察到Fe3 +离子的线强度降低，而Cr3 +离子的线强度同时升高。有趣的是，在低于80 K的EPR光谱中已观察到Cr3 +和Fe3 +线的强度逐渐降低至零。本文的目的是，首先进行一系列研究，以揭示名义上存在的无意杂质的特征。如EPR测量所示，纯YAP晶体。为此，已经基于三斜（C（i））位点对称性对EPR光谱进行了自旋哈密顿量分析。 Cr3 +和Fe3 +离子的自旋哈密顿量参数，即零场分裂参数和塞曼电子张量分量，与文献数据非常吻合。基于叠加模型的EPR研究中涉及的低对称性方面的更详细分析将在其他地方提供。

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