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RESEARCH FRONT
Contents Vol 67(11)

Structural Disorder and Classical Spin-Glass Behaviour in Ba3Fe2SbO9

Josie E. Auckett A D , Wojciech Miiller A B , Maxim Avdeev B , Justin A Kimpton C and Chris D. Ling A
+ Author Affiliations
- Author Affiliations

A School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia.

B Bragg Institute, ANSTO, PMB 1, Menai, NSW 2234, Australia.

C Australian Synchrotron, 800 Blackburn Road, Clayton, Vic. 3168, Australia.

D Corresponding author. Email: josie.auckett@sydney.edu.au

Australian Journal of Chemistry 67(11) 1612-1617 https://doi.org/10.1071/CH14389
Submitted: 16 June 2014  Accepted: 28 July 2014   Published: 8 September 2014

Abstract

A new 6H-type perovskite Ba3Fe2SbO9 has been synthesised for the first time. Synchrotron and neutron powder diffraction data reveal complete structural disorder between Sb and Fe in the octahedral perovskite B sites. This results in classical spin-glass behaviour, which we characterise using magnetic susceptibility, magnetisation, and heat capacity measurements, although some evidence is seen for a transition to a partially ordered spin-glass like state below 24 K. The behaviour of Ba3Fe2SbO9 is compared with that of the 6H-type perovskite Ba3Fe2WO9, which displays antiferromagnetic character below TN = 290 K before entering a glassy state below Tf = 60 K. Differences between the magnetism in these two phases are discussed in terms of the complete structural disorder between the Fe and Sb ions in the former case, versus partial disorder (limited to the distribution and local orientation of Fe–W and Fe–Fe dimer units) in the latter.


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