Unique Mixed Valence Behavior of Tantalum and Electronic Structure of the Novel P1−xTa8+xN13(X = 0.1–0.15) Using Density Functional Theory and Soft X‐Ray Spectroscopy. - Ceniza, Claude; Pointner, Monika M.; Boyko, Teak D.; Schnick, Wolfgang; Moewes, Alexander (Chemistry - Methods, 2025)