Magnetic properties of europium-containing compounds Eu₃MO₇ (M = Nb, Ta, Ir) with fluorite-related structure have been investigated. Magnetic susceptibility measurements show that all these compounds are paramagnetic and have no magnetic ordering down to 1.8 K. At very low temperatures (T<50 K), the susceptibilities of each compound attain constant values, which is characteristic of the ground state for Eu³⁺ ions. The results of ¹⁵¹Eu Mössbauer spectroscopic measurements show that the asymmetric parameter for Eu(2) in seven-coordination is much larger than that for Eu(1) in cubic environment, which in accordance with the crystallographic result.

研究了具有萤石相关结构的含euro化合物Eu ₃ M O ₇（M = Nb，Ta，Ir）的磁性能。磁化率测量表明，所有这些化合物都是顺磁性的，并且在低至1.8 K时无磁序。在非常低的温度（T <50 K）下，每种化合物的磁化率均达到恒定值，这是Eu ³基态的特征⁺离子。结果^151个的Eu穆斯堡尔光谱测量表明，对于铕（2）在七协调不对称参数是远大于为铕（1）在立方体环境，其根据所述结晶的结果。