Structural Behaviour of Solid Solution in the SmAIO_3-TbAIO_3 System

摘要

Phase and structural behaviour in the SmAlO_3-TbAlO_3 system has been studied in the whole concentration range by means of laboratory X-ray diffraction, in situ high temperature synchrotron powder diffraction and differential thermal analysis. Formation of the continuous solid solution Sm_(1-x)Tb_xAlO_3 with the orthorhombic perovskite structure (space group Pbnm) has been established. Peculiarity of the investigated system is lattice parameter crossovers resulted in the existence of three regions with different relations of the lattice parameters. Based on the results obtained, as well as on the available literature data for the "pure" SmA10_3 and TbAlO_3, a phase diagram of the pseudo-binary SmAlO_3-TbAlO_3 system has been constructed.