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首页> 外文期刊>Journal of Materials Science >Fabrication and characterization of fine-grained barium strontium titanate ceramics by the heterogeneous precipitation method
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Fabrication and characterization of fine-grained barium strontium titanate ceramics by the heterogeneous precipitation method

机译：非均相沉淀法制备钛酸钡锶锶微晶陶瓷及其表征

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The heterogeneous precipitation method has been successfully used to prepare SrCO3 nanoparticle-coated BTO (BaCO3 or TiO2) powders by using PAA (polyacrylic acid) and NH4HCO3 as the dispersant and precipitator, respectively. Compared to the mixture obtained by the direct ball milling of the BaCO3, SrCO3 and TiO2 powders during the conventional solid-state process, this coated structure is effective for the low temperature synthesis of barium strontium titanate (BST) powders. Sintering study of the powder synthesized by this method showed the dense and fine-grained BST ceramics could be obtained at a low sintering temperature. The grain size effect on the sensitivity of the dielectric constant vs. frequencies was discussed for the first time. Compared to the coarse-grained material, the fine-grained sample exhibits the better sensitivity of dielectric constant vs. frequency at ferroelectric state. It was shown that as the grain size decreased, the transition became diffuse, transition temperature (T-c) decreased and the dielectric constant increased.
机译：异质沉淀法已成功地通过分别使用PAA（聚丙烯酸）和NH4HCO3作为分散剂和沉淀剂来制备SrCO3纳米颗粒包覆的BTO（BaCO3或TiO2）粉末。与在常规固态过程中通过直接球磨BaCO3，SrCO3和TiO2粉末获得的混合物相比，这种涂层结构对钛酸钡锶（BST）粉末的低温合成有效。通过这种方法合成的粉末的烧结研究表明，在较低的烧结温度下可以获得致密且细粒度的BST陶瓷。首次讨论了晶粒尺寸对介电常数与频率的关系的影响。与粗颗粒材料相比，在铁电状态下，细颗粒样品的介电常数相对于频率的灵敏度更高。结果表明，随着晶粒尺寸的减小，转变逐渐扩散，转变温度（T-c）降低，介电常数提高。

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