The ternary system Sm2O3-SrO-CuO: compounds and phase relations

The subsolidus phase relations of the Sm2O3-SrO-CuO ternary system have bee n investigated by X-ray powder diffraction. All samples were synthesized in air at 950-1000 degreesC. The system can be divided into ten three-phase r egions and two solid solutions. In this system, there exist one binary soli d solution Sr14-xSmxCu24Oy, one ternary solid solution Sm1+xSr2-xCu2Oy and one ternary compound SmSr3Cu2Oy. The solid solution Sr14-xSmxCu24Oy. (0 les s than or equal tox less than or equal to6.5) crystallizes in an orthorhomb ic unit cell with space group Fmmm and lattice constants of a = 3.950(1)-3. 975(1) A, b = 11.475(1)-11.311(3) Angstrom and c = 13.401(2)-12.858(4) Angs trom. The solid solution Sm1+xSr2-xCu2Oy (0 less than or equal tox less tha n or equal to0.25) belongs to an orthorhombic system with space group Immm, cell parameters a = 3.772(1)-3.774(3) A, b = 11.606(2)-11.226(6) Angstrom and c = 20.053(3)-20.086(3) Angstrom. The ternary compound SmSr3Cu2Oy cryst allizes in an orthorhombic unit cell with space group Immm and lattice cons tants of a = 3.7123(4) Angstrom, b=3.7875(3) Angstrom and c = 12.6395(9) An gstrom. (C) 2001 Elsevier Science B.V. All sights reserved.