Shihao Wang, B. Fang, Shuai Zhang, Xiaolong Lu, Jianning Ding
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引用次数: 0
摘要
将固相反应法与柠檬酸溶胶-凝胶法及自燃法相结合合成的钙钛矿(1-x)Ba0.9Sr0.1TiO3-xBi(Mg1/2Ti1/2)O3 (bst - bmt -x)粉体进行烧结制备了钙钛矿(1-x)Ba0.9Sr0.1TiO3-xBi(Mg1/2Ti1/2)O3陶瓷。bst - bmt -x陶瓷具有亚微米晶粒形貌、高密度和大电阻率等特点。此外，BST-BiMT-0.1和BST-BiMT-0.075陶瓷具有细长形状的铁电磁滞回线，从而增强了储能性能。这两种陶瓷的储能密度几乎随外加电场的增加而线性增加。1200℃烧结BST-BiMT-0.1和BST-BiMT-0.075陶瓷在25 kV/cm下的储能密度和效率C分别为141.2mJ/cm3和79.3%，158.1mJ/cm3和76.7%，超过了许多最近报道的铁电/反铁电陶瓷的值。低电场条件下储能密度和效率的提高可归因于细极化电场滞回线、高密度伴随亚微米晶粒形貌和纯钙钛矿结构。
Enhanced low electric-field energy-storage performance in Ba0.9Sr0.1TiO3-Bi(Mg1/2Ti1/2)O3 ceramics
Perovskite (1-x)Ba0.9Sr0.1TiO3-xBi(Mg1/2Ti1/2)O3 (BST-BiMT-x) ceramics were prepared by sintering the corresponding powders synthesized by combining of solid state reaction method with citrate sol-gel and selfcombustion techniques. Submicron grains morphology, high density and large resistivity were obtained in the BST-BiMT-x ceramics. In addition, the BST-BiMT-0.1 and BST-BiMT-0.075 ceramics exhibit ferroelectric hysteresis loops with slim shape which lead to enhanced energy-storage properties. The energy-storage density of these two ceramics increases almost linearly with increasing the applied electric filed. The energy-storage density and efficiency at 25 kV/cm of the BST-BiMT-0.1 and BST-BiMT-0.075 ceramics sintered at 1200?C are 141.2mJ/cm3 and 79.3%, and 158.1mJ/cm3 and 76.7%, respectively, surpassing many recently reported values for ferroelectric/antiferroelectric ceramics. The enhanced energy-storage density and efficiency under low electric field can be attributed to the slim polarization-electric field hysteresis loops, high density accompanied by submicron grains morphology and pure perovskite structure.
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