Neutron powder diffraction and magnetic studies of mesoporous Co3O4

Adrian H. Hill, Andrew Harrison, Clemens Ritter, Wenbo Yue, Wuzong Zhou

Research output: Contribution to journalArticlepeer-review

Abstract

Samples of mesoporous Co3O4, created by using mesoporous silicas KIT-6 and SBA-16 as hard templates to control the growth of Co3O4 have been investigated with SQUID magnetometry and neutron powder diffraction, to reveal the effects of high surface area on the magnetic and electronic properties. DC magnetic susceptibility measurements show lower Neel ordering temperatures and lower magnetic moments than in a "bulk" reference. A lower second transition temperature is also observed in the mesoporous samples, associated with the freezing of the surface (shell) magnetic moments. Measurements taken with increasing applied field at constant temperature show the materials to be antiferromagnetic as expected. Complementary parametric neutron powder diffraction studies show similar trends between the two mesoporous samples when looking at their Neel temperatures, and verify long range order within the samples. 

Original languageEnglish
Pages (from-to)226-231
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume323
Issue number2
DOIs
Publication statusPublished - Jan 2011

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