Figure 3.

a) Crystal structure of KMg(Mn)F₃; b) probability for the occurrence of specific Mn²⁺‐Mn²⁺ coordination environments (see text for details); c) energy of formation (E) for six possible situations in a 2 × 2 × 4 supercell of KMgF₃:Mn²⁺ with two Mg²⁺ ions substituted by two AFM or FM‐coupled Mn²⁺ ions (denoted as M1, M2, M3, M4, M5, and M6 with different shortest Mn–Mn distances); d) FT k³‐weighted χ(k)‐function of EXAFS spectrum for Mn²⁺ in KMnF₃ with Mn–F fitting; e) FT k³‐weighted χ(k)‐function of EXAFS spectrum for KMnF₃ with Mn–F, Mn–K, and Mn–Mn fitting; and f) k³‐weighted χ(k)‐function of EXAFS spectra for KMgF₃:Mn²⁺ at various Mn²⁺ doping levels.