Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 480, Issue 2, Pages L5-L8Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.01.111
Keywords
Electromechanical activity; Lead-free ceramics; Morphotropic phase boundary (MPB); Phase transition
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Funding
- Innovation and Technology Fund of the HKSAR Government [GHP/003/06]
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A high electromechanical activity is observed in the [(K0.5Na0.5)(1-x)Li-x](Nb0.8Ta0.2)O-3 (x = 0, 0.02, and 0.03) lead-free ceramic system at and around the orthorhombic (O)-tetragonal (T) phase transition temperature (TO-T). This activity is found to originate from an O-T phase transition region at ambient temperature rather than a classical morphotropic phase boundary (MPB) region intrinsic in the Pb(Zr1-xTix)O-3 (PZT) lead-based ceramic system. Li modification enables a large decrease in TO-T instead of constituting a classical MPB. In contrast to the nearly temperature-independent classical MPB behavior in the PZT system, the strong temperature-dependent phase transition behavior in the system may impose a challenge to temperature demanding applications. (C) 2009 Elsevier B.V. All rights reserved.
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