Dielectric properties of Ni-doped Ba0.5Sr0.5TiO3 ceramics prepared with hydrothermal synthesized nanopowders
Dielectric properties of Ni-doped Ba0.5Sr0.5TiO3 ceramics prepared with hydrothermal synthesized nanopowders
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DOI：
10.1007/s10971-014-3418-1
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发表时间：
2014-06
影响因子：
2.5
通讯作者：
E. Swatsitang;Thanin Putjuso
中科院分区：
文献类型：
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作者：
E. Swatsitang;Thanin Putjuso
采用水热法制备了Ba0.5Sr0.5Ti1−xNixO_3(BSTN)陶瓷。用X射线衍射仪(X射线衍射仪)和扫描电子显微镜对样品的物相和微观结构进行了表征。X射线衍射结果表明，BST纳米粉末为立方结构。当x=0.03和0.05时，随着Ni含量的增加，立方结构转变为斜方相，当x=0.03和0.05时，随着Ni(OH)2杂质相的存在，立方结构又恢复为立方结构。然而，在1200℃下烧结3h的BSTN陶瓷，在所有的Ni含量下都呈现出含有NiO杂质相的正交相结构。在Ba0.5Sr0.5TiO3结构中掺入Ni可以使样品的晶粒度从1.47tμm增加到3.26xδm，介电常数、介电损耗和相变温度都随着Ni含量的增加而降低。
Ba0.5Sr0.5Ti1−xNixO3(BSTN) ceramics were prepared from BSTN nanopowders synthesized by a hydrothermal method. The phase and microstructure of samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy. XRD results indicate a cubic structure of the pure BST nanopowders. The cubic structure can be converted to the orthorhombic phase with increasing of Ni content to x = 0.01 and returned to the cubic structure with the presence of Ni(OH)2impurity phase for x = 0.03 and 0.05. However, the BSTN ceramics sintered at 1,200 °C for 3 h revealed the orthorhombic phase structure with NiO impurity phase for all Ni content. The doping of Ni in Ba0.5Sr0.5TiO3structure can increase the grain size of samples from 1.47 to 3.26 μm. The dielectric constant, loss tangent (tanδ) and phase transition temperature of BSTN ceramics were reduced with increasing Ni content.