Structure and Magnetic Properties of KRuO4

The crystal structure of KRuO₄ is refined at both 280 and 3.5 K from neutron powder data, and magnetic properties are reported for the first time. The scheelite structure, I4₁/a, is confirmed at both temperatures. Atomic positions of greater accuracy than the original 1954 X-ray study are reported. The rare Ru⁷⁺ ion resides in a site of distorted tetrahedral symmetry with nominal electronic configuration 4d¹(e¹). Curie-Weiss parameters are near …