Hexagonal OsB2reduction upon heating in H2containing environment

Autor:	E. A. Payzant, Zhilin Xie, Nina Orlovskaya, Richard G. Blair
Rok vydání:	2014
Předmět:	Diffraction Materials science Valence (chemistry) Hydrogen Metallurgy chemistry.chemical_element Oxygen Industrial and Manufacturing Engineering Metal Crystallography chemistry visual_art Ceramics and Composites visual_art.visual_art_medium Osmium Boron Water vapor
Zdroj:	Advances in Applied Ceramics. 114:114-120
ISSN:	1743-6761 1743-6753
DOI:	10.1179/1743676114y.0000000212
Popis:	The stability of hexagonal ReB2 type OsB2 powder upon heating under reforming gas was investigated. Pure Os metal particles were detected by powder X-ray diffraction starting at 375°C and complete transformation of OsB2 to metallic Os was observed at 725°C. The mechanisms of precipitation of metallic Os is proposed and changes in the lattice parameters of OsB2 upon heating are analysed in terms of the presence of oxygen or water vapour in the heating chamber. Previous studies suggested that Os atoms possess (0) valence, while B atoms possess both (+3) and (−3) valences in the alternating boron/osmium sheet structure of hexagonal (P63/mmc, No. 194) OsB2; if controllable method for Os removal from the lattice could be found, the opportunity would arise to form two-dimensional (2D) layers consisting of pure B atoms.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8d20fa29d8bfc0310d2faf01d8c6f9b2 https://doi.org/10.1179/1743676114y.0000000212 Zobrazit plný text záznamu