1 Erratum to: METALLURGICAL AND MATERIALS TRANSACTIONS A, VOLUME 45A, OCTOBER 2014, pp. 4863–4874 DOI: 10.1007/s11661-014-2440-9

In the published article the double arrows inadvertently disappeared from Eqs. [4], [10], and [15]. Following are the corrected equations:

$$ \frac{1}{2}{\text{N}}_{2} \rightleftarrows \left[ {\text{N}} \right].$$
(4)
$$ {\text{NH}}_{3} \rightleftarrows \left[ {\text{N}} \right] + \frac{3}{2}{\text{H}}_{2}.$$
(10)
$$ {\text{NH}}_{3} \rightleftarrows \frac{1}{2}{\text{N}}_{2} + \frac{3}{2}{\text{H}}_{2}.$$
(15)