“…In our previous studies, we focused mostly on the structural properties of the sample, while the chemical composition was investigated only to a limited extent. Specifically, in our recent works, 42 , 43 the main results were related to the microstructure of the material, revealing ab elongated domains interconnected by means of grain boundaries, while the chemical variation was only qualitatively assessed. Here, we used a ternary phase diagram to identify two distinct chemical phases within the sample, which could not be resolved based only on the STEM imaging and EELS elemental mapping alone.…”