High temperature Ir segregation in Ir-B ceramics: Effect of oxygen presence on stability of IrB2 and other Ir-B phases

Z. Xie; A. C. Terracciano; D. A. Cullen; R. G. Blair; N. Orlovskaya

doi:10.1179/1743676115Y.0000000002

High temperature Ir segregation in Ir-B ceramics: Effect of oxygen presence on stability of IrB₂ and other Ir-B phases

Z. Xie
, A. C. Terracciano
, D. A. Cullen
, R. G. Blair
, N. Orlovskaya

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The formation of IrB₂, IrB_1.35, IrB_1.1 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.

Original language	English
Pages (from-to)	429-435
Number of pages	7
Journal	Advances in Applied Ceramics
Volume	114
Issue number	8
DOIs	https://doi.org/10.1179/1743676115Y.0000000002
State	Published - Nov 2015

Funding

This work was supported by NSF project DMR-0748364. Electron microscopy was performed as part of a user project supported by ORNL''s Center for Nanophase Materials Sciences (CNMS), which is a DOE Office of Science User Facility.

Keywords

Catalyst
Ceramics
Ir Segregation
Iridium diboride
Mechanochemistry
Metal Clustering

Access to Document

10.1179/1743676115Y.0000000002

Cite this

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title = "High temperature Ir segregation in Ir-B ceramics: Effect of oxygen presence on stability of IrB2 and other Ir-B phases",

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.",

keywords = "Catalyst, Ceramics, Ir Segregation, Iridium diboride, Mechanochemistry, Metal Clustering",

author = "Z. Xie and Terracciano, \{A. C.\} and Cullen, \{D. A.\} and Blair, \{R. G.\} and N. Orlovskaya",

note = "Publisher Copyright: {\textcopyright} 2015 Institute of Materials, Minerals and Mining.",

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T2 - Effect of oxygen presence on stability of IrB2 and other Ir-B phases

AU - Xie, Z.

AU - Terracciano, A. C.

AU - Cullen, D. A.

AU - Blair, R. G.

AU - Orlovskaya, N.

PY - 2015/11

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AB - 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.

KW - Catalyst

KW - Ceramics

KW - Ir Segregation

KW - Iridium diboride

KW - Mechanochemistry

KW - Metal Clustering

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