BaCl_2中Eu^(2+)的电子自旋共振研究

ELECTRON SPIN RESONANCE INVESTIGATION OF Eu^(2+) IN BaCl_2

制备和用X射线分析BaCl_2:Eu微晶的结构,并测量它的电子自旋共振(ESR)谱,结构分析和ESR谱都表明,替代Ba^(2+)的Eu^(2+)离子是处在轴对称的正交晶场中;并用抽对称的自旋哈密顿量和晶场哈密顿量对ESR实验数据进行拟合,求得在正交对称的BaCl_2中的Eu^(2+)的自旋哈密顿参数;还发现Eu替代Ba^(2+)的掺杂浓度的饱和值为0.34mol％。

The ESR spectra of BaCl2: Eu powder showed that Eu2+ ion substituting the ion Ba2+ is situated in a crystal field of the orthorhcmbic symmetry. By fitting the ESR experimental data to the axial symmetric spin Hamiltonian and the crystal field Hamiltonian, the spin Hamiltonian parameters were obtained. In addition, based on variation of ESR peak-hight versus doping concentration of Eu, the doping value Cs for saturated substitution of Eu2+ was found to be 0.34 mol%.