Title :
New high temperature morphotropic phase boundary piezoelectric ceramics
Author :
Shrout, Thomas R. ; Eitel, Richard ; Randall, Clive A. ; Alberta, Edward ; Rehrig, Paul W.
Author_Institution :
Mater. Res. Lab., Pennsylvania State Univ., University Park, PA, USA
fDate :
28 May-1 June 2002
Abstract :
New morphotropic phase boundary (MPB) piezoelectrics with ferroelectric phase transitions (Tc) exceeding that of PbZrO3-PbTiO3 (PZT) were investigated. Based on a perovskite tolerance factor - Tc relationship, new high Tc MPB systems were projected in Bi(Me)O3-PbTiO3 systems, where Me is a relatively large B+3-site cation. For the (1-x)BiScO3-(x)PbTiO3 solid solution, a MPB was found at x-0.64 separating the rhombohedral and tetragonal phases, with correspondingly enhanced dielectric and piezoelectric properties. A transition temperature Tc of ∼450°C was determined with higher Tcs projected with lower tolerance factor systems.
Keywords :
bismuth compounds; capacitance; dielectric losses; ferroelectric transitions; lead compounds; piezoceramics; capacitance; ceramic processing; dielectric loss; enhanced dielectric properties; enhanced piezoelectric properties; ferroelectric phase transitions; high temperature morphotropic phase boundary; ionic radii; perovskite tolerance factor; piezoelectric ceramics; polycrystalline ceramics; rhombohedral phases; tetragonal phases; Ceramics; Dielectrics; Educational institutions; Equations; Ferroelectric materials; Laboratories; Piezoelectric materials; Piezoelectric transducers; Solids; Temperature dependence;
Conference_Titel :
Applications of Ferroelectrics, 2002. ISAF 2002. Proceedings of the 13th IEEE International Symposium on
Print_ISBN :
0-7803-7414-2
DOI :
10.1109/ISAF.2002.1195923
