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Fabrication and Research on Lead-free （Ba, Sr）TiO3 Based Ceramics

Author: LiPing
Tutor: QuYuanFang
School: Tianjin University
Course: Materials Science
Keywords: Barium strontium titanate Antimony oxide Neodymia Dielectric properties Doping
CLC: TQ174.1
Type: Master's thesis
Year: 2009
Downloads: 57
Quote: 0
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Abstract


The influences of Sb2O3, SrCO3 and technical parameters on microstructure and properties were investigated in Barium strontium titanate based ceramics in this paper.Structural analysis of raw material was studied using X-ray diffraction. Dielectric properties of the samples were measured at 1 kHz using Automatic LCR Meter 4425 under 1 kHz condition at room temperature, and C were also obtained from -20℃to +85℃. From those measurements, some properties of the samples, such as the variable rate of the dielectric constants with temperature,were acquired.The experimental results stated that: (1) Sb3+ ions enter the A-site of perovskite (ABO3) in (Ba0.992-xSrxNd0.008)TiO3.004 ceramics firstly, so the domain structure changes which leadεup and tanδdown, thus the dielectric properties are improved. With the increasing of Sb2O3 content, Sb3+ started to enter the B-site, as a result the dielectric properties decreased, while the curve ofε-T became gently when Sb3+ content equaled 1.6wt%. (2) Dielectric constantsε, dielectric losses tanδand coefficients of dielectric-temperature of the samples under high temperature were down with SrCO3 content increasing; in the same time, the resistant rateρand coefficients of dielectric-temperature of the samples under low temperature was up. (3) Industry raw material TiO2-B can restrain and broaden dielectric constant in the Cuie temperature effectively as its impurity while almost can’t remove the Cuie temperature.(4) Industry raw material BaCO3-B had a great effect on remove the Cuie temperature as its impurity and had‘double peak’phenomenon (5)A lead free dielectric was attained with dielectric constant more than 4000, dielectric loss 0.009, coefficients of dielectric-temperature lower than 10% by adjust the content of BaCO3-B, TiO2-B and Sb2O3. (6)Technical parameters were also studied, mainly sintering temperature, formation press, and first milling time.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Basic theory
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