FIn Fig. 5, the surface exchange coefficients are plotted against the inverse
temperature. All samples exhibit a typical Arrhenius behaviour
meaning that the surface incorporation reaction is thermally activated.
Obviously doping with Al, Mg and Fe increases the incorporation rate
of oxygen into the ATLS. Except for the iron doping where the results
are not clear, the other two doping elements increase the exchange
rate by one order of magnitude.