PHASE T,x-DIAGRAM OP Pb_(1-x) Ca_xTiO_3 SINGLE CRYSTALS

摘要

Phase T,x-diagram of the Pb_(1-x) Ca_xTiO_3(O≤x≤0.62) solid solution system has been constructed in the range from room temperature to 770 K using data of single crystal optical studies and x-ray microanalysis. Besides the typical for PbTiO_3 ferroelectric tetragonal and paraelectric cubic phases, two ferro- and non-ferroelectric ones having the pseudomonoclinic unit cell distortions also as two additional tetragonal phases, at least one of which is confidently non-ferroelectric, have been found and their exact stability limits have been determined.