The Electron Paramagnetic Resonance of Mn²⁺ Ions Surrounded by an Octahedron of Fluorine Ions

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The measurements of the EPR of Mn²⁺ ions as dilute, substitutional impurities in the single crystals of KMgF₃, KCdF₃, KCaF₃, K₂MgF₄ and NaMgF₃ were made. An X-ray examination revealed that divalent metal ions in these crystals were surrounded by an octahedron of six fluorine ions. The F¹⁹ “super-hfs” superimposed on the usual hfs of Mn⁵⁵ has been observed. The dependence of the F¹⁹ hf interaction constant (A_s) upon the Mn²⁺–F⁻ distance has been noticed and discussed. The A_s in KMnF₃ has been estimated to be somewhat smaller than 16.7×10⁻⁴ cm⁼¹.