Materials Research Bulletin, Vol.29, No.10, 1073-1078, 1994
New Praseodymium Strontium Copper-Oxygen Compounds
Superconducting oxide related compounds in the Pr-Sr-Cu-O system under 1 atm Of O2 at 1080-degrees-C were investigated. Pr2-xSr1+xCu2O6-delta (x=0.15, 0.85 less-than-or-equal-to x less-than-or-equal-to 1.00), Pr2-ySryCuO4-delta (y=0.4, 1.43), and Pr8Sr7Cu2Ox were prepared in the system of Pr-Sr-Cu-O at 1080-degrees-C under 1 atm of O2. The crystal structures of Pr2-xSr1+xCu2O6-delta were 2126-type (x=0.15) and super-structures (a x 3a x c) of 2126-type (0.85 less-than-or-equal-to x less-than-or-equal-to 1.00). Pr1.6Sr0.4CuO4 had the T*-type structure. The structure of Pr0.57Sr1.43CuO4-delta Was related to the K2NiF4-type (T-type) structure. The X-ray powder diffraction pattern of Pr8Sr7Cu2Ox was indexed with hexagonal lattice parameters of a=10.164 and c=3.623angstrom. Orthorhombic compounds of Pr3.8Sr3.2Ox and PrSr2Ox were prepared in the Pr-Sr-O system. All of these compounds showed semiconducting behavier.