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Structure-composition-property relationships of stoichiometric and non-stoichiometric "Bi12MO20" sillenites

Hu, Yu (2013) Structure-composition-property relationships of stoichiometric and non-stoichiometric "Bi12MO20" sillenites. PhD thesis, University of Sheffield.

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Abstract

The structure-composition-property relationships of sillenite-type compounds Bi12MxO20±δ, where M = Zn2+, Mg2+, Fe3+, Al3+, In3+, Ga3+, B3+, Si4+, V5+ and P5+ have been investigated. This has enabled improved understanding associated with the following aspects: (i) approval of the structural model of Radaev and co-workers’ (R model); (ii) validity of the general formula for sillenites suggested by Valant and Suvorov (VS); (iii) rationalisation of the linear trend(s) between dopant ion (M) size and unit cell length as reported by Poleti et al.; (iv) the origins of the low (LT) and high temperature (HT) bulk dielectric relaxation effects in sillenites; (v) the variation in bulk conductivity of stoichiometric and non-stoichiometric sillenites; (vi) potential physical applications of sillenites as Low Temperature Co-fired Ceramics (LTCC) dielectrics and/or mixed ionic-electronic conductors.

Item Type: Thesis (PhD)
Keywords: Stoichioemtric and non-stoichiometric sillenite Bi12MxO20±δ, where M = Zn2+, Mg2+, Fe3+, Al3+, In3+, Ga3+, B3+, Si4+, V5+ and P5+; neutron powder diffraction; Crystallographic Rietveld refinement; Radaev's structural model; Valant and Suvorov's general formula; origins of low (LT) and high temperature (HT) bulk dielectric relaxation effects; Low Temperature Co-fired Ceramics (LTCC)materials; mixed ionic/electronic conductors
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Materials Science and Engineering (Sheffield)
Identification Number/EthosID: uk.bl.ethos.581666
Depositing User: Yu Hu
Date Deposited: 20 Sep 2013 12:41
Last Modified: 03 Oct 2016 12:07
URI: http://etheses.whiterose.ac.uk/id/eprint/4489

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