We present X-ray and magnetization results for the compound [Y0.75Ca0.25]SrBaCu3-x (PO4)xOy with 0.0 ≤ x ≤ 0.30 synthesized at normal pressure and temperature. X-ray diffraction patterns show that for x = 0.0 the compound crystallizes into an orthorhombic phase. For increasing x a tetragonal phase is obtained. The Rietveld method was used to refine lattice constants. The magnetization measurements show that the samples were all superconductors over a range of temperatures from 10 to 100 K. The diamagnetic transition temperature Tc decreases with increasing (PO4)3- concentration (Tc = 55 K for x = 0.0 and Tc = 35 K for x = 0.30). © 2001 Elsevier Science B.V.
Gonzalez Gonzalez, J. C., Albino Aguiar, J., Quezado, S., Dezanetie, L. M., Chu, C. W., & Dominguez, A. B. (2001). Synthesis, structure and superconductivity of [Y<inf>0.75</inf>Ca<inf>0.25</inf>]SrBaCu<inf>3-x</inf> (PO<inf>4</inf>)<inf>x</inf>O<inf>y</inf> with 0.0 ≤ x ≤ 0.30. Physica C: Superconductivity and its Applications, 441-443. https://doi.org/10.1016/S0921-4534(01)00115-0