Synthesis and electrical properties of Nb-doped BaTiO3
Synthesis and electrical properties of Nb-doped BaTiO3
复制标题
Nb掺杂BaTiO3的合成及电学性能
DOI：
10.1039/b601251e
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发表时间：
2006
影响因子：
--
通讯作者：
A. West
中科院分区：
文献类型：
--
作者：
N. Masó;H. Beltrán;E. Cordoncillo;A. Flores;P. Escribano;D. Sinclair;A. West
通过两种方法制备的通式为BaTi 1 - 5xNb 4xO 3的Nb掺杂的BaTiO 3固溶体，所述两种方法为在1500 ℃下的固态反应和由高纯度醇盐前体在900 ℃下最终热处理的溶胶-凝胶合成，在0 ≤
X
≤ 0.055（5）。介电常数的测量表明，在获得高品质的，电均匀的样品通过固态反应的困难，即使样品名义上是纯相的X-射线粉末衍射。一个部分相图已建成显示之间的过渡，四方晶系，立方晶系和六方晶系的多晶型物作为一个功能的组合物。从溶胶-凝胶样品中得到并在900 °C下烧结的颗粒是高度绝缘的，具有约1.5 eV的活化能。在这些烧成条件下，没有证据表明电子补偿，和折射率，掺杂BaTiO 3与Nb。
Nb-doped BaTiO3 solid solutions of general formula, BaTi1−5xNb4xO3 prepared by two methods, solid state reaction at 1500 °C and sol–gel synthesis from high purity alkoxide precursors with final heat treatment at 900 °C, form over the range 0 ≤
x
≤ 0.055(5). Permittivity measurements demonstrated the difficulty in obtaining high quality, electrically-homogeneous samples by solid state reaction, even though samples were nominally phase-pure by X-ray powder diffraction. A partial phase diagram has been constructed showing the transitions between tetragonal, cubic and hexagonal polymorphs as a function of composition. Pellets derived from sol–gel samples and sintered at 900 °C were highly insulating, with an activation energy of ∼1.5 eV. Under these firing conditions, there was no evidence of electronic compensation, and semiconductivity, on doping BaTiO3 with Nb.