Type

Journal Article

Authors

John Michael David Coey
Munuswamy Venkatesan
Wolfgang Schmitt
John Coey
Hongzhou Zhang

Subjects

Physics

Topics
magnetic properties nanoparticles antiferromagnetism paramagnetism electron microscopy lanthanum compounds single crystals electron microscopes

Synthesis, characterization and magnetic properties of ultrafine Co3O4 octahedra (2015)

Abstract Octahedral Co3O4 nanoparticles were synthesised in an aqueous ammonia solution using hexagonal β-Co(OH)2 nanoplates as starting materials. Electron microscopy analysis indicates that the Co3O4 particles have diameters of 20-40 nm and adopt a well-crystallized cubic spinel structure. The octahedral habit was verified by high angle annular dark field imaging. High resolution electron microscopy results revealed that the long axis of the octahedral Co3O4 nanoparticles coincides with crystallographic <111> direction and the facets are the {111} planes. Magnetization measurements reveal antiferromagnetic ordering below 10 K, with a paramagnetic Curie temperature of 3 K and a paramagnetic susceptibility that is double that expected for high-spin Co2+. The results show that a substantial fraction of the B-site Co3+ in the nanoparticles is in a high-spin state.
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Full list of authors on original publication

John Michael David Coey, Munuswamy Venkatesan, Wolfgang Schmitt, John Coey, Hongzhou Zhang

Experts in our system

1
John Michael David Coey
Trinity College Dublin
Total Publications: 213
 
2
Munuswamy Venkatesan
Trinity College Dublin
Total Publications: 49
 
3
Wolfgang Schmitt
Trinity College Dublin
Total Publications: 43
 
4
Hongzhou Zhang
Trinity College Dublin
Total Publications: 50