Interstitial dinitrogen makes PtN2 an insulating hard solid - art. no. 153102 | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Interstitial dinitrogen makes PtN2 an insulating hard solid - art. no. 153102

Type de publication:

Journal Article

Source:

Physical Review B, Volume 7315, Ticket 15, p.20-23 (2006)

ISBN:

0556-2805

URL:

http://prola.aps.org

Mots-clés:

Noble-metal-nitride; nitrogen-

Résumé:

Recent synthesis of platinum nitride has provoked considerable interest on account of the compound's anomalously high bulk modulus, which is more than 30% higher than that of the parent metal. Numerous theoretical studies have since offered contradicting hypotheses on the structure and properties of this compound. Here we show, based on first-principles calculations, that the recently synthesized phase of platinum nitride has the pyrite structure. In the PtN2 pyrite structure single-bonded N-2 units occupy the octahedral interstitial sites of the Pt close-packed lattice, giving rise to strong, directional Pt-N bonds and to an insulating character. Excellent agreement with x-ray, Raman, and compressibility measurements is obtained.

Notes:

INFM, Democritos Natl Simulat Ctr, I-34014 Trieste, Italy; SISSA, Int Sch Adv Studies, I-34014 Trieste, Italy; Univ Paris 06, F-75252 Paris, France; Inst Phys Globe, F-75252 Paris 05, France; Inst Mineral & Phys Milieux Condenses, F-75252 Paris 05, France; Univ Edinburgh, Sch Phys, Edinburgh EH9 3JZ, Midlothian, Scotland; Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh EH9 3JZ, Midlothian, Scotland; Abdus Salam Int Ctr Theoret Phys, I-34014 Trieste, ItalyArticleEnglish