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首页> 外文期刊>Physica, B. Condensed Matter >EPR and optical absorption study of Cr3+-doped ammonium oxalate monohydrate single crystals
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EPR and optical absorption study of Cr3+-doped ammonium oxalate monohydrate single crystals

机译:Cr3 +掺杂草酸铵一水合物单晶体的EPR和光吸收研究

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The electron paramagnetic resonance (EPR) study of the Cr3+-doped ammonium oxalate monohydrate (AOM) single crystal is done at room temperature. Two magnetically inequivalent sites for chromium are observed. The hyperfine structure for Cr-53 isotope is also obtained. The spin Hamiltonian parameters are evaluated as: D = (309 +/- 2) x 10(-4) cm(-1), E = (103 +/- 2) x 10(-4) cm(-1), g = 1.9820 +/- 0.0002, A = (161 +/- 2) x 10(-4)cm(-1) for site I and D=(309 +/- 2) x 10(-4) cm(-1), E=(103 +/- 2)x 10(-4)cm(-1), g = 1.9791 +/- 0.0002, A = (160 +/- 2) x 10(-4)cm(-1) for site II, respectively. On the basis of EPR data the site symmetry of Cr3+ doped single crystal is discussed. The optical absorption spectra are recorded in 195-925 nm wavelength range at room temperature. The energy values of different orbital levels are determined. On the basis of EPR and optical data, the nature of bonding in the crystal is discussed. The values of different parameters are B = 803, C = 3531, D-q = 2208 cm(-1), h = 0.59 and k = 0.21, where B and C are Racah parameters, D-q is crystal field parameter and h and k are nephelauxetic parameters, respectively. (C) 2008 Elsevier B.V. All rights reserved.
机译:Cr3 +掺杂草酸铵一水合物(AOM)单晶的电子顺磁共振(EPR)研究在室温下进行。观察到铬的两个磁不等价位。还获得了Cr-53同位素的超精细结构。自旋哈密顿参数的计算公式为:D =(309 +/- 2)x 10(-4)cm(-1),E =(103 +/- 2)x 10(-4)cm(-1), g = 1.9820 +/- 0.0002,对于位置I,A =(161 +/- 2)x 10(-4)cm(-1),D =(309 +/- 2)x 10(-4)cm(- 1),E =(103 +/- 2)x 10(-4)cm(-1),g = 1.9791 +/- 0.0002,A =(160 +/- 2)x 10(-4)cm(- 1)分别用于站点II。基于EPR数据,讨论了Cr3 +掺杂单晶的位点对称性。在室温下在195-925nm波长范围内记录光吸收光谱。确定不同轨道水平的能量值。基于EPR和光学数据,讨论了晶体中键合的性质。不同参数的值是B = 803,C = 3531,Dq = 2208 cm(-1),h = 0.59和k = 0.21,其中B和C是Racah参数,Dq是晶体场参数,h和k是肾上腺素参数。 (C)2008 Elsevier B.V.保留所有权利。

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