STRUCTURES IN THE SYSTEM CATIO3 SRTIO3

At room temperature the sequence of phases with increasing amounts of strontium in the system CaTiO3/SrTiO3 is orthorhombic (Pnma), orthorho mbic (Bmmb), tetragonal (I4/mcm), and cubic (Pm3m). All phase boundari es shift toward smaller strontium contents with increase of temperatur e. Volume changes resulting from phase transformations are small for a ll compositions. Shape changes are greatest (similar to 0.3%) for the Bmmb/I4/mcm transition, but would probably be accommodated by microtwi nning and so are unlikely to affect the mechanical integrity of a spec imen. (C) 1998 Academic Press.