Title :
Relaxor based fine grain piezoelectric materials
Author :
Kim, N. ; Jang, S.J. ; Shrout, T.R.
Author_Institution :
Mater. Res. Lab., Pennsylvania State Univ., University Park, PA, USA
Abstract :
The dielectric and piezoelectric properties of polycrystalline ceramics of relaxor ferroelectric lead magnesium niobate-lead titanate modified with La2O3 (1-x) (Pb0.985 La0.01) □0.005(Mg1/3Nb2/3)O3 -(x)PbTiO3, were investigated. The compositional range of 0.2 ⩽x⩽0.4, being near the morphotropic phase boundary, was characterized. Lanthanum doping resulted in reduction of grain size, enhanced density, and a downward shift of the dielectric maximum temperature. The final microstructures of all compositions were fine with uniform grain size distributions. Room-temperature dielectric constants Ks of 5000 and piezoelectric constants d33(s) of 500 pC/N were found for compositions near the morphotropic phase boundary (x≈0.33)
Keywords :
crystal microstructure; ferroelectric materials; grain size; lanthanum compounds; lead compounds; permittivity; piezoelectric materials; PMN:La-PbTiO3; PbMgO3NbO3:La-PbTiO3; dielectric constants; dielectric maximum temperature; enhanced density; ferroelectric; fine grain piezoelectric materials; grain size; microstructures; morphotropic phase boundary; piezoelectric constants; polycrystalline ceramics; relaxor; Ceramics; Dielectrics; Grain size; Lanthanum; Lead; Magnesium; Niobium; Piezoelectric materials; Relaxor ferroelectrics; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 1990., IEEE 7th International Symposium on
Conference_Location :
Urbana-Champaign, IL
Print_ISBN :
0-7803-0190-0
DOI :
10.1109/ISAF.1990.200325
