It is found that the core-shell structured grains are easy to produce for fine grain doped BaTiO3 ceramics in the sintering process. We study the influence of the core-shell structure on the Curie-Weiss temperature an...It is found that the core-shell structured grains are easy to produce for fine grain doped BaTiO3 ceramics in the sintering process. We study the influence of the core-shell structure on the Curie-Weiss temperature and dielectric properties of BaTiO3 ceramics by using effective medium approximation （EMA）. Considering the second approximation, the dielectric properties of fine grain doped BaTiO3 ceramics are consistent with experimental data.展开更多
BaCO_3微粉原料通常由尺寸较大的棒状颗粒所组成,这些棒状颗粒在一次球磨过程中由于不容易粉碎,从而对经预烧、二次球磨所得到的BaTiO_3陶瓷微粉的化学组分的均匀性和颗粒度产生影响,进而影响后序烧结制备的BaTiO_3陶瓷的微观组织结构...BaCO_3微粉原料通常由尺寸较大的棒状颗粒所组成,这些棒状颗粒在一次球磨过程中由于不容易粉碎,从而对经预烧、二次球磨所得到的BaTiO_3陶瓷微粉的化学组分的均匀性和颗粒度产生影响,进而影响后序烧结制备的BaTiO_3陶瓷的微观组织结构和压电性能。本研究重点探讨了以BaCO_3和Ti O_2为原料、通过固相反应途径制备BaTiO_3陶瓷时,实施原料预处理对所制备的BaTiO_3压电陶瓷物性的影响。研究发现,配料前对BaCO_3原料实施球磨预处理可明显地降低棒状颗粒的尺寸,从而可获得颗粒度细化的BaTiO_3陶瓷微粉,进而制备致密度更高和晶粒尺寸更小而压电性能更高的BaTiO_3陶瓷材料。研究中对BaCO_3微粉进行不同时间的球磨预处理,然后制备钛酸钡陶瓷,考察了其压电性能、介电性质、铁电性能和微观结构等物理性质。利用同样的BaCO_3微粉原料,未经球磨预处理所制备的BaTiO_3陶瓷的压电系数d33最高值为410 p C/N,而实施合适的球磨预处理制备的BaTiO_3陶瓷的压电系数d33最高值可达470 p C/N。展开更多
基金supported by the Natural Science Foundation of Shanxi Province,China(Grant No.2012011028-2)
文摘It is found that the core-shell structured grains are easy to produce for fine grain doped BaTiO3 ceramics in the sintering process. We study the influence of the core-shell structure on the Curie-Weiss temperature and dielectric properties of BaTiO3 ceramics by using effective medium approximation （EMA）. Considering the second approximation, the dielectric properties of fine grain doped BaTiO3 ceramics are consistent with experimental data.
文摘BaCO_3微粉原料通常由尺寸较大的棒状颗粒所组成,这些棒状颗粒在一次球磨过程中由于不容易粉碎,从而对经预烧、二次球磨所得到的BaTiO_3陶瓷微粉的化学组分的均匀性和颗粒度产生影响,进而影响后序烧结制备的BaTiO_3陶瓷的微观组织结构和压电性能。本研究重点探讨了以BaCO_3和Ti O_2为原料、通过固相反应途径制备BaTiO_3陶瓷时,实施原料预处理对所制备的BaTiO_3压电陶瓷物性的影响。研究发现,配料前对BaCO_3原料实施球磨预处理可明显地降低棒状颗粒的尺寸,从而可获得颗粒度细化的BaTiO_3陶瓷微粉,进而制备致密度更高和晶粒尺寸更小而压电性能更高的BaTiO_3陶瓷材料。研究中对BaCO_3微粉进行不同时间的球磨预处理,然后制备钛酸钡陶瓷,考察了其压电性能、介电性质、铁电性能和微观结构等物理性质。利用同样的BaCO_3微粉原料,未经球磨预处理所制备的BaTiO_3陶瓷的压电系数d33最高值为410 p C/N,而实施合适的球磨预处理制备的BaTiO_3陶瓷的压电系数d33最高值可达470 p C/N。
