Terahertz(THz) technique is a new measurement technique that has emerged in recent years.For the measurement of solid concentration,a radiation attenuation method and a phase delay method were developed,which are base...Terahertz(THz) technique is a new measurement technique that has emerged in recent years.For the measurement of solid concentration,a radiation attenuation method and a phase delay method were developed,which are based on the Beer-Lambert law.Experimental work was carried out on a terahertz time-domain spectroscopy system(THz-TDS).Results obtained verify that the terahertz technique may provide a possible new solution to the problem of solid concentration measurement and the two proposed measurement methods are effective.Experiment results also indicate that the phase delay method is more accurate than the radiation attenuation method and the size of the particles affects the measurement results of both methods.展开更多
The capacity intermittent titration technique (CITT) was developed based on the ratio of potentio-charge capacity to galvano-charge capacity (RPG) method, to continuously determine the solid diffusion coefficient (D) ...The capacity intermittent titration technique (CITT) was developed based on the ratio of potentio-charge capacity to galvano-charge capacity (RPG) method, to continuously determine the solid diffusion coefficient (D) of the intercalary species within insertion-host materials with a small voltage region. The linear equations of D vs the value of ratio of the potentio-charge capacity to the galvano-charge capacity (q) were given. By the CITT technique,the Li+ solid diffusion coefficients within LiMn2 O4 at different voltages were determined. The results show that the values of D varied from 3. 447× 10-9 to 7.60× 10-11 cm2/s in the voltage range of charge from 3.3 to 4.3 V as a function of voltage with "W" shape.展开更多
After diffusion couples were annealed at 260-360 ℃, the concentration profiles of Zn element were measured by EPMA. It has been first quantitatively determined by Matano method that the interdiffusion coefficient in ...After diffusion couples were annealed at 260-360 ℃, the concentration profiles of Zn element were measured by EPMA. It has been first quantitatively determined by Matano method that the interdiffusion coefficient in A1-Zn fee solid solution containing high Zn contents is remarkably decreased due to the small addition of Cu. Also, the interdiffusion coefficient in A1-Zn fee solid solution clearly increases with the increasing of Zn concentration. The interdiffusion activity energy remarkably decreases with the increasing of Zn contents. On the other hand, the interdiffusion activity energy markedly increases due to the small addition of Cu in the A1 Zn fcc solid solution containing high Zn contents.展开更多
基金Supported by National Natural Science Foundation of China(50576084,60532020)
文摘Terahertz(THz) technique is a new measurement technique that has emerged in recent years.For the measurement of solid concentration,a radiation attenuation method and a phase delay method were developed,which are based on the Beer-Lambert law.Experimental work was carried out on a terahertz time-domain spectroscopy system(THz-TDS).Results obtained verify that the terahertz technique may provide a possible new solution to the problem of solid concentration measurement and the two proposed measurement methods are effective.Experiment results also indicate that the phase delay method is more accurate than the radiation attenuation method and the size of the particles affects the measurement results of both methods.
基金Project (20406024) supported by the National Natural Science Foundation of China project (76600) supported by the Postdoctoral Science Foundation of Central South University
文摘The capacity intermittent titration technique (CITT) was developed based on the ratio of potentio-charge capacity to galvano-charge capacity (RPG) method, to continuously determine the solid diffusion coefficient (D) of the intercalary species within insertion-host materials with a small voltage region. The linear equations of D vs the value of ratio of the potentio-charge capacity to the galvano-charge capacity (q) were given. By the CITT technique,the Li+ solid diffusion coefficients within LiMn2 O4 at different voltages were determined. The results show that the values of D varied from 3. 447× 10-9 to 7.60× 10-11 cm2/s in the voltage range of charge from 3.3 to 4.3 V as a function of voltage with "W" shape.
文摘After diffusion couples were annealed at 260-360 ℃, the concentration profiles of Zn element were measured by EPMA. It has been first quantitatively determined by Matano method that the interdiffusion coefficient in A1-Zn fee solid solution containing high Zn contents is remarkably decreased due to the small addition of Cu. Also, the interdiffusion coefficient in A1-Zn fee solid solution clearly increases with the increasing of Zn concentration. The interdiffusion activity energy remarkably decreases with the increasing of Zn contents. On the other hand, the interdiffusion activity energy markedly increases due to the small addition of Cu in the A1 Zn fcc solid solution containing high Zn contents.
