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.

• 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;