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Fabrication and characterisation of nickel manganite thin films by pulsed laser deposition

Dorey, Shaun (2016)
Ph.D. thesis, University of Birmingham.

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Abstract

Nickel Manganite (NiMn2O4) thin films (~3µm thickness) have been deposited on polycrystalline alumina substrates using pulsed laser deposition (PLD). The influence of deposition conditions, including substrate temperature and oxygen partial pressure, on the structure and properties of the films has been investigated. The effect of post-deposition annealing at 800°C in oxygen has also been studied. The structure and microstructure of the films were characterised by X-ray diffraction (XRD), and scanning electron microscopy (SEM). A four-wire resistance measurement technique was also carried out to measure the resistance and to calculate the films electrical parameters. Optimisation of the deposition parameters enabled films to be produced which exhibit characteristic negative temperature coefficient of resistance (NTC) thermistor behaviour. The dependence of the structure and properties of the films on deposition conditions will be presented and discussed. This study has demonstrated that PLD is a promising technique for fabricating high quality NiMn2O4 thin films suitable for use as NTC thermistors.

Type of Work:Ph.D. thesis.
Supervisor(s):Button, Tim W
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:6971
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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