Nanostructure Control of Barium Titanate–Potassium Niobate Nanocomplex Ceramics and Their Enhanced Ferroelectric Properties
Nanostructure Control of Barium Titanate–Potassium Niobate Nanocomplex Ceramics and Their Enhanced Ferroelectric Properties
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钛酸钡-铌酸钾纳米复合陶瓷的纳米结构控制及其增强的铁电性能
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Furukawa
中科院分区：
文献类型：
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作者：
S. Wada;K. Yamashita;I. Fujii;K. Nakashima;N. Kumada;C. Moriyoshi;Y. Kuroiwa;Y. Fujikawa;D. Tanaka;M. Furukawa
采用溶剂热法制备了不同KN/BT摩尔比的钛酸钡（BaTiO3，BT） -铌酸钾（KNbO3，KN）纳米复合陶瓷。透射电镜（TEM）观察证实，通过控制KN/BT摩尔比，BT颗粒上的KN层厚度可控制在5 ~ 40 nm之间。在室温和1 MHz下测量了它们的介电常数，测得KN厚度为22 nm的BT-KN纳米复合陶瓷的最大介电常数为370。透射电镜观察发现，在KN厚度小于22 nm时，BT/KN异质外延界面被分配为应变界面，而在40 nm时，界面被分配为松弛界面。这些结果表明应变的异质外延界面可能是导致介电性能增强的原因。
Barium titanate (BaTiO3,BT)–potassium niobate (KNbO3,KN) nanocomplex ceramics with various KN/BT molar ratios were prepared by a solvothermal method. From a transmission electron microscopy (TEM) observation, it was confirmed that the KN layer thickness on BT particles was controlled from 5 to 40 nm by controlling KN/BT molar ratios. Their dielectric constants were measured at room temperature and 1 MHz, and the maximum dielectric constant of 370 was measured for the BT–KN nanocomplex ceramics with a KN thickness of 22 nm. TEM observation revealed that at a KN thickness below 22 nm, the BT/KN heteroepitaxial interface was assigned as a strained interface, while at 40 nm, the interface was assigned as a relaxed one. These results suggested that the strained heteroepitaxial interface could be responsible for the enhanced dielectric properties.
影响因子：
3.7
作者：
Schoenau, Kristin A.;Schmitt, Ljubomira A.;Hoffmann, Michael J.
通讯作者：
Hoffmann, Michael J.