Evidence for a low-compressibility carbon nitride polymorph elaborated at ambient pressure and mild temperature - Laboratoire Magmas et Volcans Accéder directement au contenu
Article Dans Une Revue Diamond and Related Materials Année : 2009

Evidence for a low-compressibility carbon nitride polymorph elaborated at ambient pressure and mild temperature

Résumé

Superhard materials like diamond are essential for abrasive or cutting tool applications. In this way, carbon nitrides are of relevant interest because they are expected to exhibit exceptional mechanical properties, high values of bulk modulus being predicted. A smart and simple method was used to synthesize carbon nitrides and allowed elaborating a low-compressibility polymorph. The processing consists in the decomposition of commercial thiosemicarbazide (H2NC(S)N2H3) powder at ambient pressure and 600 °C under nitrogen flow. Besides the presence of a graphitic C3N4 phase, a nanocrystalline material is obtained and is identified as a cubic carbon nitride with a cell parameter of 3.163 Å. Its impressive bulk modulus of 355 GPa propels it as a challenger for cubic boron nitride among low-compressibility materials. Thus, we prove that, in accordance with previous numerous theoretical predictions, crystalline carbon nitrides exhibit exceptional compressibility behaviour. Moreover, our synthesis strategy evidences that, despite usual admitted considerations, severe and expensive pressure and temperature conditions are not mandatory to elaborate low-compressibility covalent materials, which could give new insights for their development.
Fichier principal
Vignette du fichier
09038.pdf (207.88 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00369094 , version 1 (08-04-2009)

Identifiants

Citer

Graziella Goglio, Denis Foy, Stanislav Pechev, Jérôme Majimel, Gérard Demazeau, et al.. Evidence for a low-compressibility carbon nitride polymorph elaborated at ambient pressure and mild temperature. Diamond and Related Materials, 2009, 18 (4), pp.627-631. ⟨10.1016/j.diamond.2008.10.060⟩. ⟨hal-00369094⟩
312 Consultations
477 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More