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Herein, the standard enthalpies of formation, \u0394\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sub>f<\/jats:sub>\n                    <jats:sup>\u00b0<\/jats:sup>\n                    , for all\n                    <jats:italic>Ln<\/jats:italic>\n                    N compounds (\n                    <jats:italic>Ln<\/jats:italic>\n                    \u2009=\u2009La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Lu; excluding Pm) are determined via high temperature oxide melt calorimetry. These measurements are supported by high temperature oxidation studies of La, Ce, Sm, Eu, Er, Yb bearing\n                    <jats:italic>Ln<\/jats:italic>\n                    N compounds using X-ray diffraction and thermogravimetric analysis, and are cross-examined against recent high temperature measurements on other\n                    <jats:italic>Ln<\/jats:italic>\n                    N compounds\n                    <jats:sup>1<\/jats:sup>\n                    . It was determined that \u0394\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sub>f<\/jats:sub>\n                    <jats:sup>\u00b0<\/jats:sup>\n                    systematically correlates with the ionic radius of\n                    <jats:italic>Ln<\/jats:italic>\n                    <jats:sup>3+<\/jats:sup>\n                    cations, with smaller\n                    <jats:italic>Ln<\/jats:italic>\n                    bearing nitrides having more negative values. A discontinuity in \u0394\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sub>f<\/jats:sub>\n                    <jats:sup>\u00b0<\/jats:sup>\n                    was further observed between larger and smaller\n                    <jats:italic>Ln<\/jats:italic>\n                    bearing\n                    <jats:italic>Ln<\/jats:italic>\n                    N compounds. Using the determined \u0394\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sub>f<\/jats:sub>\n                    <jats:sup>\u00b0<\/jats:sup>\n                    values with literature references, Gibbs energies of formation (\u0394\n                    <jats:italic>G<\/jats:italic>\n                    <jats:sub>f<\/jats:sub>\n                    <jats:sup>\u00b0<\/jats:sup>\n                    ), oxidation (\u0394\n                    <jats:italic>G<\/jats:italic>\n                    <jats:sub>ox<\/jats:sub>\n                    <jats:sup>\u00b0<\/jats:sup>\n                    ) and hydrolysis (\u0394\n                    <jats:italic>G<\/jats:italic>\n                    <jats:sub>hyd<\/jats:sub>\n                    <jats:sup>\u00b0<\/jats:sup>\n                    ) are calculated and compared against uranium nitride (UN) in the context of UN based nuclear fuel and related spent nuclear fuel (SNF) management. The calculations indicate that the occurrence of\n                    <jats:italic>Ln<\/jats:italic>\n                    N phases within UN based SNF should lead to stabilisation of the structure and inhibit its oxidation.\n                  <\/jats:p>","DOI":"10.1038\/s42004-026-02236-8","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T16:14:09Z","timestamp":1791389649000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The energetics of high temperature oxidation and formation mechanisms in binary lanthanide nitrides (LnN)"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-7666-7771","authenticated-orcid":false,"given":"P.","family":"Uhlemann","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-0659-1582","authenticated-orcid":false,"given":"W.","family":"Vance","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6565-9509","authenticated-orcid":false,"given":"M. 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