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Preparation and Properties of Tungsten Bronze Type Lead-Free Piezoelectric Ceramics Ba2NaNb5O15

Author: GaoShuai
Tutor: MaWeiBing
School: Tianjin University
Course: Materials Science
Keywords: Ba2NaNb5O15 Rod-like grains Liquid phase sintering Polarization
CLC: TM282
Type: Master's thesis
Year: 2009
Downloads: 59
Quote: 0
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Abstract


Piezoelectric ceramic , in particular, lead zirconate titanate system , in the electronic information, such as integrated circuits industry in a wide range of applications . In recent years , the development of lead-free piezoelectric ceramics because of the hazards of lead , and the people on the importance of environmental issues , a new direction of development of the piezoelectric ceramic . This article discuss the tungsten bronze free piezoelectric ceramics Ba 2 NaNb 5 O 15 system through copper oxide and bismuth oxide doped to improve their sintering characteristics and dielectric properties , piezoelectric properties , in order to meet the requirements of lead-free piezoelectric ceramics . Ordinary solid state reaction method , discussion the pure Ba < / sub > NaNb , 5 the O 15 < / sub> sintering process and inhibiting sodium evaporation method ; through in Ba < SUB > 2 NaNb 5 < / sub > O 15 < / sub > system doped with copper oxide and bismuth oxide, to reduce the sintering temperature , while suppressing the BA 2 < / sub> NaNb 5 O 15 in abnormal growth of the rod - like grains sintered density . Both the mechanism of action during the sintering process , the copper oxide by the formation of solid solution of CuO-BaO promoting the sintering , and the bismuth oxide is reduced by liquid phase sintering temperature because of its low melting point, a single . Promote sintering Cu in 2 < / sup> and the Bi 3 replaced by the lattice caused by the lattice distortion , the dielectric constant , piezoelectric coefficient , Curie temperature drops , and decreased with the increase of the doping amount . The case of the same amount of doping , the appropriate sintering temperature and holding time for a fully grown grains , and to improve the piezoelectric and dielectric properties . Polarization conditions are also discussed , such as the polarization time , the polarization voltage , when the polarization of temperature on piezoelectric properties obtained , the temperature is lower , better elevated poling temperature ; when the poling temperature is close to the distance temperature , The polarization voltage becomes the dominant factor. Same time , through the scanning electron microscope , X-ray diffraction analysis of the test results , to explain the phenomena and performance changes in the experimental procedure described microscopic mechanism to generate the copper oxide and bismuth oxide to promote sintering .

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