Abstract
The reasonable choice of an equation among the equations for the determination of self-diffusion coefficients from the data obtained by the capillary reservoir method is elucidated by developing an alternative form of the well-known equation. The obtained alternative form is proved to be identical theoretically with the well-defined equation. It is also shown by using the alternative form that the equation
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can be used at a lower value of \sqrtDt⁄l than 0.50 and that the equation
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can be valid at a higher value of \sqrtDt⁄l than 0.42.
The calculated value of self-diffusion coefficients of silver ion in pure molten sodium nitrate by an appropriate equation provide the validity of using the chosen equations at a given value of \sqrtDt⁄l. The obtained diffusion coefficient agrees well with the chronopotentiometric and polarographic diffusion coefficients of silver ion in pure molten sodium nitrate.
