Abstract
The properties of the quarternary systems (Sr–Pb)(Ti–Zr)O 3 and (Ba–Pb)(Ti–Sn)O 3 are studied. The shift of transition points with composition is measured by the temperature variation of the dielectric constant of the ceramic sample, and the phase diagrams at room temperature are determined with help of X-ray measurement. The phase diagram of (Sr–Pb)(Ti–Zr)O 3 includes two ferroelectric phases F α (rhombohedral) and F β (tetragonal), two antiferroelectric ones A α (pseudotetragonal) and A β (tetragonal) and a paraelectric one P . A β occupies larger area than expected. The diagram of (Ba–Pb)(Ti–Sn)O 3 resembles that of (Ba–Pb)(Ti–Zr)O 3 previously reported by the author and consists of F 1 , F 2 (the same as the low temperature phases in BaTiO 3 ), F α , F β and P , although the immiscible region is found in the composition containing smaller amounts of Ba and Ti. Roth early classified graphically the perovskite ABO 3 compounds on the basis of electronic polarizability of A ion and ionic radius of B ion. ...
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