Same as Figure 3, for the sample heated at 1073 K (Chip F). The bright, rounded feature near the top left of the EDS maps is an artifact from an epoxy bubble and not part of the sample under investigation. An interactive figure is provided in the online version of this article, showing an overlay of the Na and Al maps, with a slide bar allowing the viewer to change between them.

An interactive version of this figure is available in the online journal.