High Temperature Ir Segregation In Ir-B Ceramics: Effect Of Oxygen Presence On Stability Of Irb2 And Other Ir-B Phases

Keywords

Catalyst; Ceramics; Ir Segregation; Iridium diboride; Mechanochemistry; Metal Clustering

Abstract

The formation of IrB2, IrB1.35, IrB1.1 and IrB monoboride phases in the Ir-B ceramic nanopowder was confirmed during mechanochemical reaction between metallic Ir and elemental B powders. The Ir-B phases were analysed after 90 h of high energy ball milling and after annealing of the powder for 72 h at 1050°C in vacuo. The iridium monoboride (IrB) orthorhombic phase was synthesised experimentally for the first time and identified by powder X-ray diffraction. Additionally, the ReB2 type IrB2 hexagonal phase was also produced for the first time and identified by high resolution transmission electron microscope. Ir segregation along disordered domains of the boron lattice was found to occur during high temperature annealing. These nanodomains may have useful catalytic properties.

Publication Date

11-1-2015

Publication Title

Advances in Applied Ceramics

Volume

114

Issue

8

Number of Pages

429-435

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1179/1743676115Y.0000000002

Socpus ID

84983162478 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84983162478

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