Crystal Structures and Magnetic Properties of CrO4-4-Containing Oxides: Sr2CrO4, Ba2CrO4, and Ba3CrO5

Refinement of the crystal structures of Ba2CrO4 and Ba3CrO5 using powder neutron diffraction data has confirmed that the former is isostructural with β-K2SO4 and the latter isostructural with Cs3CoCl5. Ba2CrO4 is orthorhombic, Pnma (No. 62), Z = 4 with a = 7.6285(5) Å, b = 5.9136(5), c = 10.4639(8), and V = 472.04(5) Å3 Ba3CrO5 is tetragonal, I 4/mcm (No. 140), Z = 4 with a = 7.3033(3) Å, c = 11.6704(6), V = 622.48(4) Å3 from powder Guinier …