The gradient in Co ratio was also lower for 63%Ni (increase of 0.08/0.07 from core to surface) compared to 80%Ni (0.15/0.09) and 86%Ni (0.15/0.15). In contrast, the extent of increase in Mn ratio from core to surface did not show a clear trend across the samples, with 0.079/0.072 for 63%Ni, 0.085/0.087 for 80%Ni, and 0.044/0.061 for 86%Ni. In previous studies, higher linear interdiffusion rates were measured for Ni and Co compared to Mn, which could account for the greater decrease in heterogeneity of elemental content for those elements at longer spatial distances.