THE SOLID-SOLUTION STRUCTURE OF BISRXCA1-XO2.50

The formation and solid-solution structure of BiSrxCa1-xO2.50 were stu died by X-ray powder diffraction analysis, and the crystallography dat a of the phase are given. The crystal structure of BiSrxCa1-xO2.50 bel ongs to the monoclinic system with space group P1m1 or P12/m1, and the cell parameters for BiCaO2.50 (x = 0.00) are a = 1.8363 nm, b = 0.536 6 nm, c = 1.4670 nm and beta = 100.26 degrees. BiSrxCa1-xO2.50 is a so lid solution of Bi-Ca-O and Bi-Sr-O. When the strontium solid solubili ty Sr / Sr + Ca = 0.50, the strontium dissolved in the phase reaches s aturation, while the strontium solid solubility limit of the phase is between 0.67 and 0.75, and beyond this limit the crystal structure is greatly distorted.