SPACE-CHARGE SEGREGATION AT GRAIN-BOUNDARIES IN TITANIUM-DIOXIDE .1. RELATIONSHIP BETWEEN LATTICE DEFECT CHEMISTRY AND SPACE-CHARGE POTENTIAL
SPACE-CHARGE SEGREGATION AT GRAIN-BOUNDARIES IN TITANIUM-DIOXIDE .1. RELATIONSHIP BETWEEN LATTICE DEFECT CHEMISTRY AND SPACE-CHARGE POTENTIAL
复制标题
DOI：
10.1111/j.1151-2916.1993.tb03964.x
复制
发表时间：
1993-10-01
影响因子：
3.9
通讯作者：
CHIANG, YM
中科院分区：
文献类型：
--
作者：
IKEDA, JAS;CHIANG, YM
TiO2 中界面和本体之间的电势差是从明确包含高温晶格缺陷化学的空间电荷模型中获得的，作为温度、氧压和受主或施主掺杂的函数。使用先前文献研究中的 TiO2 缺陷平衡常数，结果表明，对于由界面离子缺陷平衡确定的空间电荷，未掺杂和受体掺杂的 TiO2 中的电势为负，而在高供体浓度下电势为正。由于还原缺陷的影响，即使在相当氧化的环境下，等电点也位于高温下的施主掺杂区域。
The electrical potential difference between the interface and the bulk in TiO2 is obtained as a function of temperature, oxygen pressure, and acceptor or donor doping from a space charge model that explicitly includes the high-temperature lattice defect chemistry. Using defect equilibrium constants for TiO2 from previous literature studies, it is shown that for a space charge determined by ionic defect equilibration with the interface, the potential is negative in undoped and acceptor-doped TiO2 and positive at high donor concentrations. The isoelectric point lies in the donor-doped regime at high temperatures due to the contribution of defects from reduction, even for fairly oxidizing ambients.