Warburg coefficient
The Warburg coefficient (or Warburg constant), , is the diffusion coefficient of ions in solution, associated to the Warburg element,
. The Warburg coefficient,
, also written as,
, has the units of
The value of can be obtained by the gradient of the Warburg plot, a linear plot of the real impedance (
) against the reciprocal of the square root of the frequency (
). This relation should always yield a straight line, as it is unique for a Warburg.