# Low dimensional structures of some mixed metal oxides containing antimony: synthesis and characterisation

de Laune, Benjamin Paul (2013). Low dimensional structures of some mixed metal oxides containing antimony: synthesis and characterisation. University of Birmingham. Ph.D.

## Abstract

This thesis describes the synthesis and characterisation of phases related to schafarzikite (FeSb$$_2$$0$$_4$$). A range of Co$$_1$$$$_-$$$$_x$$Fe$$_x$$Sb$$_2$$$$_-$$$$_y$$Pb$$_y$$O$$_4$$ (where x = 0, 0.25, 0.50 and 0.75; y = 0-0.75) compounds have been synthesised and characterised by a variety of techniques e.g. neutron powder diffraction (NPD).

The refined lattice parameters for all compounds range between a = 8.4492(2) Å - 8.5728(2) Å and c = 5.9170(1) Å - 6.0546(2) Å (NPD, 300 K). The magnetic structures of Co$$_0$$$$_.$$$$_2$$$$_5$$Fe$$_0$$$$_.$$$$_7$$$$_5$$Sb$$_2$$O$$_4$$ and Co$$_0$$$$_.$$$$_5$$$$_0$$Fe$$0$$$$_.$$$$_5$$$$_0$$Sb$$_2$$O$$_4$$ have been shown to possess dominant A- type ordering as a result of overriding direct exchange interactions between intrachain transition metal cations, whilst all other phases show dominant C- type ordering consistent with 90˚ superexchange. Unusual negative susceptibility is seen and explained in several samples including CoSb$$_2$$O$$_4$$. All phases are shown to display canted antiferromagnetic magnetic order.

The synthesis of LiSbO$$_2$$ is described and its structure determined: P2$$_1$$$$_/$$$$_c$$ symmetry with a = 4.8550(3) Å, b = 17.857(1) Å, c = 5.5771(4) Å, β = 90.061(6)˚. Its electrical and thermal properties are described.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Supervisor(s):
Supervisor(s)EmailORCID
Greaves Professor, ColinUNSPECIFIEDUNSPECIFIED
Licence:
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Chemistry
Funders: None/not applicable
Subjects: Q Science > QD Chemistry
URI: http://etheses.bham.ac.uk/id/eprint/3999

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