The phase diagram of the SrO-R2O3-CuOx system, where R=Ho, was investigated in air. The tie-line relationships of this system were determined. Two ternary phases were found, namely, the green phase SrHo2CuO5 and the A14-24 solid solution (Sr14-xHox)Cu24O41. The green phase is isostructural to its Ba-analog, BaHo2CuO5, and is orthorhombic with space group Pbnm, and cell parameters a=7.0971(13) , b=12.0262(23) , and c=5.5849(12) . Holmium was found to substitute for the Sr site in the solid solution (Sr14-xHox)Cu24O41 up to the value of x . 5. The melting temperature range of this solid solution is from 975 C, to 1025 C, for x=0 to x=5, respectively. The Sr-analog of the high Tc superconductor Ba2HoCu3O6+x was not observed in this system.
Journal of Solid State Chemistry
14-24 phase, crystal chemistry, green phase, phase diagram, SrO-R<sub>2</sub>O<sub>3</sub>-CuO<sub>x</sub>, superconductor related