Influence of crystallization on electrical prosses and magnetic interaction in iron phospate glass

Pavić, Luka (2014) Influence of crystallization on electrical prosses and magnetic interaction in iron phospate glass. Doctoral thesis, Faculty of Science > Department of Chemistry.

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n the thesis, the crystallizat ion effect on the electrical processes and the magnetic interactions in glass wit h composit ion 40Fe2O3-60P2O5(mol%) was investigated. Controlled crystallizat ion leads to partially and fully crystallized glasses. This glass exhibits the electronic conduct ion, as a result of electron hopping from Fe2+ to Fe3- ions, which is described by small polaron hopping model, whereas magnet ically belongs to the spin-glass. The influence of crystallizat ion temperature and t ime on structural changes, the appearance of crystalline phases, their interactions and influence on electrical transport and magnet ic properties have been invest igated. Various methods were used: DTA, XRPD, spectroscopy (Raman, Mössbauer and Impedance) together with magnetochemical measurements (VSM). Depending on crystallizat ion temperature and t ime, various phases occur in glass matrix such as: Fe3(P2 O7)2, Fe4(P2O7)3 and Fe(PO3). Total conduct ivit y decreases in the first stage of the crystallizat ion process and achieves its minimum. Wit h further increase of the crystallizat ion temperature, the electrical conduct ivit y rises as a result of an enhanced crystallinit y. Contribution of the each phase to the total conduct ivit y is determined. Magnetic measurements showed dominant antiferomagnet ic interactions in all samples but some weak ferromagnet ic interact ions were also present in crystallized samples.

Item Type: Thesis (Doctoral thesis)
Keywords: electrical processes, crystallizat ion, magnet ic interact ions, structure, iron phosphate glass
Supervisor: Moguš-Milanković, Andrea
Date: 2014
Number of Pages: 198
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: mag. bibl. Ana Šafran
Date Deposited: 18 Dec 2014 15:16
Last Modified: 14 Oct 2015 08:13

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