Synthesis and structural characterization of the vividly colored first row transition metal-containing oxyfluoride antiperovskites Sr_(3-x)Mn_xMO_4F and Sr_(3-x)Mn_xMO_(4-α )F_(1-δ) (M = Al, Ga)

摘要

Incorporation of dopant amounts of the divalent transition metal cation Mn2+ into the oxyfluoride material Sr3-xMnxMO4F (M = Al, Ga; 0 = x = 0.1) yields green powders which vary in hue depending on the identity of M. Treatment of these phases with post-synthesis annealing under reducing conditions produces anion deficient phases according to Sr3-xMnxMO4-alpha F1-delta displaying vivid purple coloration. Intense colors are likely due to small amounts of Mn3+ on the tetrahedral M site. Full structural characterization based upon powder X-ray diffraction (PXRD), neutron powder diffraction (NPD), and thermogravimetric analysis (TGA) data are presented herein, demonstrating that the Sr3-xMnxMO4F = Ca, Sr, Ba; M = Al, Ga) anti-perovskite structure can readily accommodate first row transition metals.