Temperature stability of ([Na{sub 0.5}K{sub 0.5}NbO{sub 3}]{sub 0.93}-[LiTaO{sub 3}]{sub 0.07}) lead-free piezoelectric ceramics

Journal Article · Mon Jun 01 04:00:00 EDT 2009 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3153157· OSTI ID:21294136

Skidmore, Thomas A; Comyn, Tim P; Milne, Steven J ^[1]

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1. Institute for Materials Research, University of Leeds, Leeds LS2 9JT (United Kingdom)

A polymorphic phase transition (PPT) is often engineered into lead-free materials to generate high piezoelectric activity at room temperature, limiting their temperature stability. We report [Na{sub 0.5}K{sub 0.5}NbO{sub 3}]{sub 0.93}-[LiTaO{sub 3}]{sub 0.07} tetragonal ceramics with favorable properties over a broad temperature range due to a high Curie temperature at 447 deg. C and PPT at -15 deg. C involving a transition to a monoclinic rather than low temperature orthorhombic phase. Piezoelectric k{sub 31} and d{sub 31} coefficients varied from 0.19 to 0.14 and -53 to -33 pC/N, respectively, over the range of -15 to 300 deg. C. Strain-electric field loops provided strains of {approx}0.2% and a high-field d{sub 33} of 205 pm/V.

• OSTI ID: 21294136
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 22 Vol. 94; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CURIE POINT
ELECTRIC FIELDS
FERROELECTRIC MATERIALS
LITHIUM COMPOUNDS
MONOCLINIC LATTICES
NIOBATES
ORTHORHOMBIC LATTICES
PERMITTIVITY
PHASE TRANSFORMATIONS
PIEZOELECTRICITY
POTASSIUM COMPOUNDS
SODIUM COMPOUNDS
TANTALATES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K