Phase transition and electrical properties of (K0.5Na0.5)(Nb1-xTax)O3lead-free piezoelectric ceramics

Dunmin Lin; Kin Wing Kwok; H. L.W. Chan

doi:10.1007/s00339-007-4391-0

Phase transition and electrical properties of (K_0.5Na_0.5)(Nb_1-xTa_x)O₃lead-free piezoelectric ceramics

Dunmin Lin, Kin Wing Kwok, H. L.W. Chan

Research output: Journal article publication › Journal article › Academic research › peer-review

83 Citations (Scopus)

Abstract

(K0.5Na0.5)(Nb1-xTax)O3lead-free piezoelectric ceramics have been prepared by an ordinary sintering technique. The results of X-ray diffraction reveal that Ta5+diffuses into the K0.5Na0.5NbO3lattices to form a solid solution with an orthorhombic perovskite structure. Because of the high melting temperature of KTaO3, the (K0.5Na0.5)(Nb1-xTax)O3ceramics can be sintered at higher temperatures. The partial substitution of Ta5+for the B-site ion Nb5+decreases both paraelectric/cubic-ferroelectric/tetragonal and ferroelectric/tetragonal- ferroelectric/orthorhombic phase transition temperatures, TCand TO-T. It also induces a relaxor phase transition and weakens the ferroelectricity of the ceramics. The ceramics become 'softened', leading to improvements in d33, kp, ktand εrand a decease in Ec, Qmand Np. The ceramics with x=0.075-0.15 become optimum, having d33=127-151 pC/N, kp=0.43-0.44, kt=0.43-0.44, εr=541-712, tanδ=1.75-2.48% and TC=378-329 °C.

Original language	English
Pages (from-to)	167-171
Number of pages	5
Journal	Applied Physics A: Materials Science and Processing
Volume	91
Issue number	1
DOIs	https://doi.org/10.1007/s00339-007-4391-0
Publication status	Published - 1 Apr 2008

ASJC Scopus subject areas

General Chemistry
General Materials Science

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title = "Phase transition and electrical properties of (K0.5Na0.5)(Nb1-xTax)O3lead-free piezoelectric ceramics",

abstract = "(K0.5Na0.5)(Nb1-xTax)O3lead-free piezoelectric ceramics have been prepared by an ordinary sintering technique. The results of X-ray diffraction reveal that Ta5+diffuses into the K0.5Na0.5NbO3lattices to form a solid solution with an orthorhombic perovskite structure. Because of the high melting temperature of KTaO3, the (K0.5Na0.5)(Nb1-xTax)O3ceramics can be sintered at higher temperatures. The partial substitution of Ta5+for the B-site ion Nb5+decreases both paraelectric/cubic-ferroelectric/tetragonal and ferroelectric/tetragonal- ferroelectric/orthorhombic phase transition temperatures, TCand TO-T. It also induces a relaxor phase transition and weakens the ferroelectricity of the ceramics. The ceramics become 'softened', leading to improvements in d33, kp, ktand εrand a decease in Ec, Qmand Np. The ceramics with x=0.075-0.15 become optimum, having d33=127-151 pC/N, kp=0.43-0.44, kt=0.43-0.44, εr=541-712, tanδ=1.75-2.48% and TC=378-329 °C.",

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AB - (K0.5Na0.5)(Nb1-xTax)O3lead-free piezoelectric ceramics have been prepared by an ordinary sintering technique. The results of X-ray diffraction reveal that Ta5+diffuses into the K0.5Na0.5NbO3lattices to form a solid solution with an orthorhombic perovskite structure. Because of the high melting temperature of KTaO3, the (K0.5Na0.5)(Nb1-xTax)O3ceramics can be sintered at higher temperatures. The partial substitution of Ta5+for the B-site ion Nb5+decreases both paraelectric/cubic-ferroelectric/tetragonal and ferroelectric/tetragonal- ferroelectric/orthorhombic phase transition temperatures, TCand TO-T. It also induces a relaxor phase transition and weakens the ferroelectricity of the ceramics. The ceramics become 'softened', leading to improvements in d33, kp, ktand εrand a decease in Ec, Qmand Np. The ceramics with x=0.075-0.15 become optimum, having d33=127-151 pC/N, kp=0.43-0.44, kt=0.43-0.44, εr=541-712, tanδ=1.75-2.48% and TC=378-329 °C.

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Phase transition and electrical properties of (K_0.5Na_0.5)(Nb_1-xTa_x)O₃lead-free piezoelectric ceramics

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