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Study on Preparation Powers and Electric Properties of Na0.5Bi0.5TiO3-based Lead-free Piezoceramics

Author: HeTian
Tutor: DaiJinHui
School: Ocean University of China
Course: Materials Physics and Chemistry
Keywords: ( Na0.5Bi0.5 ) TiO3 -based ceramics Powder synthesis Piezoelectric properties Ferroelectric properties
CLC: TB383.3
Type: Master's thesis
Year: 2007
Downloads: 277
Quote: 3
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Abstract


Sodium bismuth titanate (Na0.5Bi0.5) TiO3 (referred to NBT) is a Class the perovskite A bit ionic complex substituted ferroelectric its Curie point (Tc) of 320 ° C, at room temperature, has a strong ferroelectricity, is considered to be the most promising candidate materials for lead-free piezoelectric ceramic one. In this thesis, the traditional solid-phase method, Salt and Hydrothermal Synthesis of ([Bi0.5 (Na1-x-yKxLiy) 0.5] TiO3), NBT-based ceramic powder, powder Synthesis and Preparation ; NBT-polarization behavior of the ceramic material and piezoelectric properties were analyzed NBT-based ceramic piezoelectric properties and composition of the correlation between the structure and the binding assay results of NBT-based ceramic ferroelectric nature of piezoelectric properties of materials and the role of law. In this paper, the traditional solid-phase method and molten salt synthesis of NBT-based ceramic powder, to determine the appropriate preparation conditions. Respectively by XRD analysis of the resulting product. Through analysis and comparison of the solid state reaction temperature on the phase composition, studies confirm that the ideal process parameters of the solid-phase synthesis of NBT-based ceramic powder to 850 ° C-2H; the molten salt Preparation powder ideal process parameters 700 ° C-4h. SEM image analysis results show that the relatively complete, two methods synthesized of NBT powder grain development and grain size; obvious the microscopic appearances picture of the powder obtained by the solid-phase synthesis method visible like \In addition, the hydrothermal synthesis of NBT ceramic powder, orthogonal experiment and analysis, to determine the appropriate synthesis conditions. The mineralizer concentration of NaOH at 160 ° C under 12 mol / L for 24h can be obtained crystals developed, fully cubic phase NBT ceramic ultra-fine powder. Salt and traditional solid phase prepared by NBT-based ceramic samples sintering process: insulation 2h at 1150 ℃. Investigated the polarization behavior of the NBT-based ceramics from three aspects of the polarization voltage polarization temperature and polarization time, polarization conditions on the piezoelectric constant d33 to determine the appropriate polarization conditions: 80-90 ℃ oil bath, add the DC field 3.5kV/mm polarization 20min. The piezoelectric properties test results show that: the molten salt prepared ceramic samples d33 can reach 160pC / N, and the corresponding traditional solid-phase ceramic samples prepared only 110 pC / N. With K, Li content changes, Salt and piezoelectric properties of conventional solid-phase method showed the same trend: significant upward trend with increasing Li content, the piezoelectric constant; With K doping amount of the increase in , piezoelectric constant was first increased and then decreased. Ferroelectric properties of test results show that: there are significantly related to changes in the content of K, Li, NBT-based ceramics variation of ferroelectric properties and piezoelectric properties. Doped with an appropriate amount of K, Li, reduces the coercive field Ec (7.3kV/mm → 3.06kV/mm) maintain the remanent polarization Pr 30μC/cm2, thereby improving the piezoelectric properties of the ceramic samples. Comprehensive performance test results show that: the molten salt prepared ceramic samples of performance are superior to traditional solid phase prepared ceramic samples.

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