Mixed valence niobium (IV, V) perovskite solid solutions of the type A(x)niobate (A = potassium, barium, strontium, lanthanum, europium, gadolinium, yttrium): Phase relations, crystal chemistry, electrical and magnetic properties

The structural, crystal-chemical, and electrical properties of perovskites are reviewed, with respect to metallic phases similar to tungsten bronze. Phase diagrams are presented for the SrO-NbO-NbO;The effects of A-cation substitutions in the ;The resistivity variation for ;Magnetic susceptibility measurements indicate Pauli-paramagnetism. At low temperature (...