Diffusion and electromigration in solid Na2WO4

✍ Scribed by P.H. Bottelberghs; G.H.J. Broers

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 700 KB
• Volume: 21
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(76)85001-3

✦ Synopsis

The differential equation for the case of one-dimensional diffusion/electromigration of silver ions in solid NaZWO, is solved for the case of galvanostatic electrolysis of the cell system Ag/NaZWO,/Ag. Galvanostatic pulse measurements and silver ion concentration profile measurements (by microscan analysis) of sectioned electrolyzed Ag/NazWOJAg cell arrangements were performed. The theory is not in quantitative accordance wtth the experiments, the reasons of which are discussed. According to the present study, the diffusion of Agi in a-Na,WO, (high temperature phase, 589-694"C) can be given by: Da,+ (T) = (1.3 * 0.1) x 103cm2s~'exp p(1.6 * 0.2)eV ___ ~___ I< T 4%. t) = c(x, t) ~ c* co -c* : concentration parameter. When c* < CD, then $J = &((x, t) is the local Ag, W04 mole fraction.