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Research on the Fabrication & Properties of NaNbO3-BaTiO3 Lead-free Piezoelectric Ceramics

Author: XieShiHui
Tutor: ZuoJinHao
School: Nanjing University of Aeronautics and Astronautics
Course: Applied Chemistry
Keywords: Lead-free Piezoelectric Ceramics Piezoelectricity Ferroelectricity NaNbO3-BaTiO3 Alkaline Niobate Potassium-free Piezoelectric Ceramics
CLC: TM282
Type: Master's thesis
Year: 2009
Downloads: 44
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Piezoelectric ceramics have been widely used in aeronautic and astronautic high-tech areas. However, there is a great need to develop lead-free piezoelectric ceramics with excellent properties because of the toxicity of lead.In this paper, Lead-free piezoelectric ceramics without potassium element (1-x)NaNbO3-xBaTiO3 (NNBTx) have been fabricated by a traditional ceramic sintering technique. Appropriate techniques involved with powders-synthesis and sintering were established. And then, the effects of BaTiO3 content, sintering temperature and poling electric field on crystal structure, density, dielectric, piezoelectric and ferroelectric properties were investigated. The last step was to enhance the properties of (1-x)NaNbO3-xBaTiO3 by adding the CuO additive.First of all, the best synthesis technique of NaNbO3 powders was fixed by studying the powders calcined in different ball-milled time and different temperature in the study. After adulteration, granulation, molding and sintering, the ceramics samples were fabricated. And then, silver electrodes were applied on the top and bottom surfaces of the samples for subsequent poling and measurements. Secondly, X-ray diffraction (XRD) was used to study the morphotropic phase boundary (MPB) of (1-x)NaNbO3-xBaTiO3 ceramics, and NNBT10 was considered as the best composition after measurement. Then, scanning electron microscopy (SEM) was used to investigate the change of the grains size in NNBT10 and the best sintering temperature, 1265℃, was fixed by measuring the properties. And then, the best poling electric field, 3.5kV/mm, was determined in the NNBT10 sample sintered at 1265℃by measurement.At last, the effect of the CuO additive on the properties of NNBT10 based ceramics was investigated. The CuO additive with proper content can improve the properties, like the density, the electromechanical coupling factor, the piezoelectric constant, the mechanical quality factor, the dielectric constant and the planar frequency constant, and meanwhile reduce the dielectric loss. In addition, from P-E curve, we can see that the CuO additive obviously enhances the insulated property and reduces the value of leakage.

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