Article

Critical Property in Relaxor-PbTiO(3) Single Crystals --- Shear Piezoelectric Response.

Electronic Materials Research Laboratory, Xi'an Jiaotong University, Xi'an 710049 (P. R. China).
Advanced Functional Materials (impact factor: 10.18). 06/2011; 21(11):2118-2128. DOI:10.1002/adfm.201002711
Source: PubMed

ABSTRACT The shear piezoelectric behavior in relaxor-PbTiO(3) (PT) single crystals is investigated in regard to crystal phase. High levels of shear piezoelectric activity, d(15) or d(24) >2000 pC N(-1), has been observed for single domain rhombohedral (R), orthorhombic (O) and tetragonal (T) relaxor-PT crystals. The high piezoelectric response is attributed to a flattening of the Gibbs free energy at compositions proximate to the morphotropic phase boundaries, where the polarization rotation is easy with applying perpendicular electric field. The shear piezoelectric behavior of pervoskite ferroelectric crystals was discussed with respect to ferroelectric-ferroelectric phase transitions and dc bias field using phenomenological approach. The relationship between single domain shear piezoelectric response and piezoelectric activities in domain engineered configurations were given in this paper. From an application viewpoint, the temperature and ac field drive stability for shear piezoelectric responses are investigated. A temperature independent shear piezoelectric response (d(24), in the range of -50°C to O-T phase transition temperature) is thermodynamically expected and experimentally confirmed in orthorhombic relaxor-PT crystals; relatively high ac field drive stability (5 kV cm(-1)) is obtained in manganese modified relaxor-PT crystals. For all thickness shear vibration modes, the mechanical quality factor Qs are less than 50, corresponding to the facilitated polarization rotation.

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Keywords

ac field drive stability
 
application viewpoint
 
applying perpendicular electric field
 
compositions proximate
 
dc bias field
 
facilitated polarization rotation
 
ferroelectric-ferroelectric phase transitions
 
Gibbs free energy
 
mechanical quality factor Qs
 
orthorhombic relaxor-PT crystals
 
pervoskite ferroelectric crystals
 
phenomenological approach
 
polarization rotation
 
relaxor-PT crystals
 
shear piezoelectric activity
 
shear piezoelectric behavior
 
shear piezoelectric responses
 
single domain rhombohedral
 
temperature independent shear piezoelectric response
 
thickness shear vibration modes