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Twinned EPR spectra of Fe3+ centers in ternary layered TlGaS2 crystal

机译:三元层状TlGaS2晶体中Fe3 +中心的孪生EPR谱

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摘要

TIGaS2, single crystal doped by paramagnetic Fe3+ structure of EPR spectra of paramagnetic Fe3+ ions was observed. The spectra reveal a nearly orthorhombic symmetry of the crystal field (CF) on the Fe3+ ions. Two groups each consisting of four equivalent Fe3+ centers were observed in the EPR spectra. The local symmetry of the crystal field on the Fe3+ centers and CF parameters were determined. Experimental results indicate that the Fe ions substitute Ga at the center of the GaS4 tetrahedrons. The rhombic distortion of the sulfur ligand CF is attributed to the effect of TI ions located in the trigonal cavities between the tetrahedral complexes. The observed twinning of the resonance lines indicates a presence of two non-equivalent positions of TI ions that confirms their zigzag alignment in the TIGaS2 crystal structure. (c) 2006 Elsevier Ltd. All rights reserved.
机译:观察到顺磁性Fe3 +离子的EPR谱的顺磁性Fe3 +结构掺杂的单晶TIGaS2。光谱揭示了Fe3 +离子上晶体场(CF)的近似正交对称性。在EPR光谱中观察到两组,每组由四个等效的Fe3 +中心组成。确定了Fe3 +中心晶体场的局部对称性和CF参数。实验结果表明,Fe离子取代了GaS4四面体中心的Ga。硫配体CF的菱形畸变归因于位于四面体络合物之间的三角腔中的TI离子的作用。观察到的共振线孪生表明存在TI离子的两个非等价位置,这证实了它们在TIGaS2晶体结构中的锯齿形排列。 (c)2006 Elsevier Ltd.保留所有权利。

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