A novel class of oxynitrides stabilized by nitrogen dimer formation

Title
A novel class of oxynitrides stabilized by nitrogen dimer formation
Authors
김진상최지원강종윤최정혜백승협김성근김상태권효진백성욱
Issue Date
2018-09
Publisher
Scientific Reports
Citation
VOL 8, NO 14471-8
Abstract
Despite the wide applicability of oxynitrides from photocatalysis to refractory coatings, our understanding of the materials has been limited in terms of their thermodynamics. The configurational entropy via randomly mixed O/N or via cation vacancies are known to stabilize oxynitrides, despite the positive formation enthalpies. Here, using tin oxynitrides as a model system, we show by ab initio computations that oxynitrides in seemingly charge-unbalanced composition stabilize by forming pernitrides among metal-(O,N)(6) octahedra. The nitrogen pernitride dimer, =(N-N)=, results in the effective charge of -4, facilitating the formation of nitrogen-rich oxynitrides. We report that the dimer forms only in structures with corner-sharing octahedra, since the N-N bond formation requires sufficient rotational degrees of freedom among the octahedra. X-ray photoemission spectra of the synthesized tin oxynitride films reveal two distinct nitrogen bonding environments, confirming the computation results. This work opens the search space for a novel kind of oxynitrides stabilized by N dimer formation, with specific structural selection rules.
URI
http://pubs.kist.re.kr/handle/201004/68405
ISSN
2045-2322
Appears in Collections:
KIST Publication > Article
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