HIGH TEMPERATURE TRANSPORT PROCESSES IN LITHIUM NIOBATE

被引:149
作者
JORGENSE.PJ
BARTLETT, RW
机构
[1] Stanford Research Institute, CA 94025, Menio Park
[2] Stanford University, Palo Alto
关键词
D O I
10.1016/0022-3697(69)90037-7
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The electrical conductivity of single crystal lithium niobate (LiNbO3) was determined as a function of temperature for various oxygen partial pressures. The electrical conductivity is proportional to Po2- 1 4 which can be explained by a defect equilibrium involving singly ionized oxygen vacancies and electrons. Measurements of electrical transport numbers at 1000°K show the electrical conductivity of LiNbO3 to be ionic at one atmosphere of oxygen and electronic at low oxygen partial pressures. Thermoelectric measurements indicate that LiNbO3 at low oxygen partial pressures is n-type and that the concentration of electrons at 1000°K and in an atmosphere of 50% C0/50% CO2a is 4 × 1017cm3 with a mobility of 1.7 cm2V sec. The diffusion of oxygen in LiNbO3 was determined as a function of temperature at an oxygen partial pressure of 70 Torr. by measuring O18/O16 isotope exchange with the gas phase as a function of time. The diffusion data may be represented by D = 3.03 × 10-6 exp ( -29.4 kcal mole-1 RT)cm2sec. Consideration of the Nernst-Einstein relation for oxygen and the variation in conductivity with Li2O activity indicate that the ionic conduction is caused by transport of lithium ions. © 1969.
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页码:2639 / &
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