微波辅助sol-gel法合成Bi_(0.5)Na_(0.5)TiO_(3)粉体及其压电性能研究

Study on Microwave-Assisted Sol-Gel Synthesis of Bi_(0.5)Na_(0.5)TiO_(3) Powders and Their Piezoelectric Properties

采用微波辅助溶胶-凝胶(sol-gel)法制备Bi_(0.5)Na_(0.5)TiO_(3)(BNT)粉体,通过DSC/TG,XRD,SEM,FT-IR等表征方法,分析BNT的反应历程,煅烧温度对BNT成分、晶粒尺寸和压电性能的影响.结果表明,当微波煅烧温度为650℃时,可合成出高纯度BNT粉体(30~120 nm),其居里温度为394℃,d_(33)=7.5 pC/N,ε_(r)=535.58,tanδ=0.29.对比传统马弗炉煅烧sol-gel法,微波辅助sol-gel法有利于提高BNT的介电性能和居里温度,降低介质损耗.

Bi_(0.5)Na_(0.5)TiO_(3)(BNT)particles were synthesized by a microwave-assisted sol-gel method.Characterization techniques such as DSC/TG,XRD,SEM,and FT-IR were employed to analyze the reaction process of BNT and the effects of calcination temperature on the composition,grain size,and piezoelectric properties of BNT.The results showed that high-purity BNT particles of 30 nm to 120 nm could be synthesized at a microwave calcination temperature of 650℃,with a Curie temperature of 394℃,a piezoelectric constant(d_(33))of 7.5 pC/N,a relative permittivity(ε_(r))of 535.58,and a dielectric loss(tanδ)of 0.29.Compared to the traditional muffle furnace calcination sol-gel method,the microwave-assisted sol-gel approach enhances the dielectric properties and Curie temperature of BNT,while reducing the dielectric loss.