An investigation of ferroelectric and ferromagnetic oxide systems

Shanaishah, FA, 2022. An investigation of ferroelectric and ferromagnetic oxide systems. PhD, Nottingham Trent University.

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Abstract

This work presents an experimental study of perovskites, in terms of the structural, dielectric, and magnetic and optical properties. Perovskites are interesting materials to simultaneously have dielectric, magnetic properties known as Multiferroic material; these properties emerge from the coupling of spin, charge, and orbital degrees of freedom. In this work, solid state method was used to prepare the samples at three different sintering temperatures 800⁰C, 850℃ and 875⁰C at ambient pressure to determine the effect of sintering temperature on the varying value of x=0.0 to 0.2 in the perovskite structure. The compounds Bi2MnxNi2-xO6, Bi2MnxCo2-xO6 and Bi2MnxZn2-xO6 observed to have better dielectric, magnetic and optical properties as a function of varying x values as confirmed by X-ray diffraction and Rietveld refinement for structural analysis, dielectric measurement for electrical properties and magnetic moment spectroscopy for magnetic properties. However, the addition of Mn in the BiNiO3, BiCoO3 and BiZnO3 resulted in the formation of many impurities, and it was difficult to achieve single phase in any composition. The electrical properties of all compounds showed improvement in conductivity with the rise in frequency which indicates better conductive properties with the Mn addition and shows good semiconductor nature. The magnetic moment analysis at room temperature of all compounds showed that the antiferromagnetic material become ferromagnetic with the increasing content of Mn.

Item Type:	Thesis
Creators:	Shanaishah, F.A.
Contributors:	Name Role NTU ID ORCID Cave, G. Thesis supervisor CHP3CAVEGWV https://orcid.org/0000-0002-4167-1332 Brown, C. Thesis supervisor CHP3BROWNCV https://orcid.org/0000-0002-1559-3238
Date:	May 2022
Rights:	This work is the intellectual property of the author. You may copy up to 5% of this work for private study, or personal, non-commercial research. Any re-use of the information contained within this document should be fully references, quoting the author, title, university, degree level and pagination. Queries or requests for any other use, or if a more substantial copy is required, should be directed in the owner(s) of the Intellectual Property Rights.
Divisions:	Schools > School of Science and Technology
Record created by:	Jeremy Silvester
Date Added:	19 Dec 2025 11:54
Last Modified:	19 Dec 2025 11:55
URI:	https://irep.ntu.ac.uk/id/eprint/54893

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