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Fan J.,Jiangsu University | Pan T.,Kunshan PANT Piezoelectric Technology Corporation Ltd | Tang L.,Jiangsu University | Shen X.,Jiangsu University
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2010

The (Pb0.70Ba0.26Sr0.04) (Zr0.52Ti0.48)O3-x Bi2O3[Bi-PBSZT, x=0, 0.1% (mass fraction, the same below), 0.3%, 0.5%, 0.8%, 1.0%] piezoelectric and ferroelectric ceramics with Bi2O3-dopant were prepared by the roll formation and solid-state reaction process. The microstructure and phase compositions of the ceramics were investigated by scanning electron microscopy and X-ray diffraction. The bending strength (σb), relative dielectric constant (εr) and transverse piezoelectric coefficient (d31) of the ceramics were measured. The results show that when the amount of Bi2O3 addition is from 0 to 0.3%, the grain size of the Bi-PBSZT ceramics can be reduced, and its relative density increases, and its σb enhances; while its εr and d31 values exhibit a tendency of reduction. The Bi-PBSZT ceramic with 0.3% Bi2O3 addition has the optimized characteristics with σb=175.21 MPa, εr=5520, d31=518 × 10-12 m/V. Source


Li Y.,Jingdezhen Ceramic Institute | Wu F.,Jingdezhen Ceramic Institute | Pan T.,Kunshan PANT Piezoelectric Technology Corporation Ltd | Shen Z.,Jingdezhen Ceramic Institute | And 2 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2014

(K0.49Na0.51)1-xLix (Nb0.77Ta0.18Sb0.05)O3- 0.005BaZrO3(x=0.02-0.06, abbreviated KNNLTSBZx) lead-free piezoelectric ceramics were prepared by a conventional solid state reaction method. The effect of Li amount on the phase, micro-structure, piezoelectric properties and dielectric properties of samples was analyzed by X-ray diffraction, scanning electron microscopy and precision impedance analysis, respectively. The results show that all the samples possess a pure perovskite structure. When the amount of Li increases, the phase structure of the samples at room temperature changes from orthorhombic to tetragonal symmetry, the Curie temperature TC moves to a higher temperature, but orthorhombic-tetragonal phase transition temperature To-t moves to a lower temperature, even moves to the temperature below room temperature as x≥0.04. In addition, a polymorphic phase transition from orthorhombic to tetragonal symmetry occurs in the composition range of 0.04≤x≤0.06. The ceramic samples in the composition when x = 0.04 have optimal electrical properties, i. e., piezoelectric constant (d33) of 240 pC/N, planar electromechanical coefficient (kp) of 44.7%, relative dielectric constant (ε33 T/ε0) of 2090, and dielectric loss (tanδ) of 2.7%. Source


Li Y.-M.,Jingdezhen Ceramic Institute | Shen Z.-Y.,Jingdezhen Ceramic Institute | Wu F.,Jingdezhen Ceramic Institute | Pan T.-Z.,Kunshan PANT Piezoelectric Technology Corporation Ltd | And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2014

0.92(Na0.51K0.49-x Li x )NbO 3-0.02Bi0.5K0.5TiO3-0.06BaZrO 3 (x = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) lead-free piezoelectric ceramics were prepared by solid state reaction route. The effect of Li doping amount on the structure and electrical properties of the ceramics were investigated. All ceramics had pure perovskite structure, while the crystallographic symmetry changed from rhombohedral to tetragonal with the increase of Li doping amount. A PZT-like morphotropic phase boundary (MPB) with the coexistence of rhombohedral and tetragonal phases was identified in the composition of x = 0.03. As expected, the ceramics of the MPB composition showed optimal properties: piezoelectric coefficient d 33 = 227 pC/N, planar electromechanical coupling coefficient k p = 39.3 %, dielectric permittivity ε 33 T / ε 0 = 1,640, dielectric loss tanδ = 2.0 %, remnant polarization P r = 13.3 μC/cm 2, coercive field E c = 1.53 kV/mm, and Curie temperature T c = 253 C. Together with good temperature stability to 200 C, this KNN-based lead-free ceramics should be very promising for practical applications. © 2013 Springer Science+Business Media New York. Source


Li Y.-M.,Jingdezhen Ceramic Institute | Xiao Z.-G.,Jingdezhen Ceramic Institute | Xiao Z.-G.,Kunshan PANT Piezoelectric Technology Corporation Ltd | Shen Z.-Y.,Jingdezhen Ceramic Institute | And 4 more authors.
Wuji Cailiao Xuebao/Journal of Inorganic Materials | Year: 2013

(K0.45Na0.55)0.98 Li0.02(Nb0.77Ta0.18 Sb0.05)O3-xBaZrO3 (NKNLST-xBZ, x = 0-0.020 mol) lead-free piezoelectric ceramics were prepared by solid state reaction method. The effect of BaZrO3 doping amount on the piezoelectric, dielectric, electromechanical and ferroelectric properties were investigated systematically. The results revealed that the crystal structures transformed from orthorhombic phase to tetragonal phase with BaZrO3 doping amount increasing, and the coexistence of orthorhombic-tetragonal phases were observed in the x range from 0.005 to 0.008. Under the condition of two phases co-existence, the ceramic grain became small and uniform and dielectric loss tanδ significantly decreased, while the piezoelectric constant d33 and planar electro-mechanical coupling factor kp increased. The dielectric constant ε33T/ε0 of this system ceramics increased continuously with the increase of the BaZrO3 doping amount and the phase transition temperatures shifted to lower temperature. The optimized piezoelectric properties could be obtained at the x = 0.005 composition ceramic as follows: the piezoelectric constant d33 = 372 pC/N, planar electromechanical coupling coefficient kp = 47.2%, dielectric loss tan δ = 3.1%, a high dielectric constant ε33T/ε0 = 1470 and Curie temperature Tc=208°C. Source


Fan J.,Kunshan PANT Piezoelectric Technology Corporation Ltd | Xie D.,Jiangsu University | Pan T.,Kunshan PANT Piezoelectric Technology Corporation Ltd | Fang X.,Kunshan PANT Piezoelectric Technology Corporation Ltd | Shen X.,Jiangsu University
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2014

The (Pb0.70Ba0.26Sr0.04) (Zr0.52Ti0.48)O3(PBSZT) piezo ceramics were prepared by the roll formation and solid-state reaction process. The microstructure and phase compositions of the ceramics were investigated by scanning electron microscopy and X-ray diffraction. The relationships between dielectric properties (CT, tanδ) and electric field strength, electromechanical coupling coefficient (kp) and bias field strength were investigated. The results show that the free capacitance CT and tanδ increases gradually then reduces dramatically with enhancing electric field strength, In the bias field, the CT decreases with enhancing the positive bias field strength, while increases with enhancing the negative bias field strength, and tanδ rises both in the positive bias field and the negative bias field, the kp increases with enhancing the positive bias field strength while varies to same trend with reducing the negative bias field strength. The conclusions instruct that it is important to avoid the high loss point, and it is good for restraining attenuation of the piezo capability while providing a positive bias field on piezo ceramics applications. Source

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