US Patent:
20120119623, May 17, 2012
Inventors:
Ichiro Takeuchi - Berwyn Heights MD, US
Fujino Shigehiro - Nagoya City, JP
Makoto Murakami - Ann Arbor MI, US
Sung Hwan Lim - Hillsboro OR, US
Daisuke Kan - Silver Spring MD, US
Assignee:
UNIVERSITY OF MARYLAND COLLEGE PARK - College Park MD
International Classification:
H01L 41/187
H02N 2/18
US Classification:
310339, 310328, 252 629 R
Abstract:
The present invention relates to lead-free piezoelectric ceramic materials comprising crystalline (and preferably perovskite crystalline) structures of the formula Bi(RE)FeO, where RE is one or more of La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and 0≦x≦0.3. The materials are at or near the morphotropic phase boundary and display enhanced piezoelectric and dielectric properties.