Structure and electrical properties of K{sub 0.5}Na{sub 0.5}NbO{sub 3}-LiSbO{sub 3} lead-free piezoelectric ceramics

Journal Article · Sun Apr 01 00:00:00 EDT 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2715486· OSTI ID:20982806

Lin, Dunmin; Kwok, K W; Lam, K H; Chan, H L. W. ^[1]

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1. Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon (Hong Kong)

Lead-free piezoelectric ceramics (1-x)K{sub 0.5}Na{sub 0.5}NbO{sub 3}-xLiSbO{sub 3} have been fabricated by a conventional ceramic sintering technique. The results of x-ray diffraction suggest that Li{sup +} and Sb{sup 5+} diffuse into the K{sub 0.5}Na{sub 0.5}NbO{sub 3} lattices to form a solid solution with a perovskite structure. The ceramics can be well sintered at 1070-1110 degree sign C. The introduction of LiSbO{sub 3} into the Na{sub 0.5}K{sub 0.5}NbO{sub 3} solid solution decreases slightly the paraelectric cubic-ferroelectric tetragonal phase transition temperature (T{sub c}), but greatly shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition (T{sub O-F}) to room temperature. Coexistence of the orthorhombic and tetragonal phases is formed at 0.05<x<0.07 at room temperature, leading to a significant enhancement of the piezoelectric properties. For the ceramic with x=0.06, the piezoelectric properties become optimum: piezoelectric constant d{sub 33}=212 pC/N, planar and thickness electromechanical coupling factors k{sub P}=46% and k{sub t}=47%, respectively, remanent polarization P{sub r}=15.0 {mu}C/cm{sup 2}, coercive field E{sub c}=1.74 kV/mm, and Curie temperature T{sub C}=358 degree sign C.

• OSTI ID: 20982806
• Journal Information: Journal of Applied Physics, Vol. 101, Issue 7; Other Information: DOI: 10.1063/1.2715486; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIMONATES
ANTIMONY IONS
CERAMICS
CURIE POINT
ELECTRICAL PROPERTIES
LITHIUM COMPOUNDS
LITHIUM IONS
NIOBATES
ORTHORHOMBIC LATTICES
PHASE TRANSFORMATIONS
PIEZOELECTRICITY
POTASSIUM COMPOUNDS
SINTERING
SODIUM COMPOUNDS
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
X-RAY DIFFRACTION