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建立了氧化物纳米陶瓷中离子导电的模型,研究了系统中离子扩散激活能随温度、粒径、表面张力系数等的变化规律.在此基础上,确定离子电导率与温度和粒径、表面张力系数的关系.以ZrO2∶16%Y为例,探讨了线度、温度对电导率的影响.结果表明:原子振动使颗粒受的机械压力变化,降低了离子扩散的能量势垒,离子定向扩散是氧化物纳米陶瓷中离子导电的机制.离子扩散激活能随温度升高而减小,随粒径增大而增大;离子电导率随温度升高而增大,随粒径增大而减小.理论值与文献给出的实验资料相符.
The model of ionic conductivity in oxide nanocrystalline ceramics was established and the variation law of ion diffusion activation energy with temperature, particle size and surface tension coefficient was studied. Based on this, the ion conductivity, temperature and particle size, Tensile Coefficient of ZrO2: 16% Y was taken as an example to discuss the effect of linearity and temperature on electrical conductivity.The results show that the atomic vibration can change the mechanical pressure of particles and reduce the energy barrier of ion diffusion, Diffusion is the mechanism of ionic conduction in oxide nanocrystalline ceramics.The ion diffusion activation energy decreases with increasing temperature and increases with the increase of particle size.The ionic conductivity increases with the increase of temperature, Decrease.The theoretical value is consistent with the experimental data given in the literature.