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Preparation and Properties of Li+ Doped KNN and Ba2+ Doped BNT Composite Ceramics

Author: LiuShunZhou
Tutor: WangFuPing
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: Piezoelectric ceramics Perovskite stucture Piezoelectric property
CLC: TM282
Type: Master's thesis
Year: 2010
Downloads: 36
Quote: 0
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Abstract


The piezoelectric ceramics are the important materials which are widely used for piezoelectric actuators, sensors and transducer. Lead-based materials such as Lead zirconate titanate （PZT） are widely used because of their excellent properties. But the volatilization of toxic PbO during high-temperature sintering make great hame to environment and human body. With the improvement of environmental awareness and sustainable development, the development of lead-free piezoelectric ceramcis has been intensively studied.The sintering charaeteristic, the dielectric, piezoelectric and ferroelectric properties of the lead-free （1-x）(K0.5Na0.5)NbO3-xLiNbO3 （abbreviated as KLNNx） and (Na0.5Bi0.5)0.94Ba0.06TiO3 （abbreviated as BNBT6） piezoelectric ceramics were investigated systematically in this thesis in order to obtain an excellent lead-free piezoelectric ceramics. The influences of the composition, additives and processing on the properties of the ceramics were analyzed in order to obtain KLNNx-yBNBT6 at optimum conditions. The composition and processing of KLNNx-yBNBT6 were studies also to make a perfect lead-free piezoelectric ceramics.Results shows that pure perovskite structural KLNNx and BNBT6 piezoelectric ceramics can be fabricated by the conventional ceramic technique. The calcining temperature and sintering temperature have little effects on the phase structures but great effects on the microstructure and piezoelectric, ferrectric and dielectric constant at the morphortropic phase boundary. The properties have improved great with excellent piezoelectric properties and typical ferroelectric characteristic after doped, compared to pure (K0.5Na0.5)NbO3 and (Na0.5Bi0.5)TiO3. The ideal calcining temperature and sintering temperature of KLNN6 are 850℃and 1080℃respectively.The piezoelectric constant d33 is 195pC/N and dielectric constant is 7150. The Ec and the Pr is 8kV/cm and 21μC/cm2 respectively. The ideal calcining temperature and sintering temperature of BNBT6 are 900℃and 1080℃respectively.The piezoelectric constant d33, dielectric constant ,Ec , Pr is 127pC/N, 6977, 26kV/cm and 22μC/cm2 respectively.On the basis of KLNN6 and BNBT6, the calcined temperatures are 850℃and 900℃respectively, the properties of （1-y）KLNN6-yBNBT6 were studied. The results shows that 0.98KLNN6-0.02KLNN6 has the best performance with the piezoelectric constant d33, dielectric constant ,Ec , Pr is 225pC/N, 6880, 25kV/cm, 23μC/cm2 respectively .

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Electric and ceramic materials > Piezoelectric ceramics
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