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Correlation between structural changes and electrical properties of crystallized iron phosphate glass


Moguš-Milanković, Andrea; Pavić, Luka; Skoko, Željko; Graca M.P.F.; Costa, B.F.O.; Valente, M.A;
Correlation between structural changes and electrical properties of crystallized iron phosphate glass // Book of Abstract, Borate Phosphate 2014
Prag: ICARIS Ltd., 2014. str. 116-116 (predavanje, međunarodna recenzija, sažetak, znanstveni)


Naslov
Correlation between structural changes and electrical properties of crystallized iron phosphate glass

Autori
Moguš-Milanković, Andrea ; Pavić, Luka ; Skoko, Željko ; Graca M.P.F. ; Costa, B.F.O. ; Valente, M.A ;

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstract, Borate Phosphate 2014 / - Prag : ICARIS Ltd., 2014, 116-116

Skup
International conference Borate Phosphate 2014

Mjesto i datum
Pardubice, Češka, 30.6-4.7.2014

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Iron phosphate glass; glass-ceramics; structural changes; electrical properties

Sažetak
The emergence of nanocrystals in glass leads to changes in the properties thus opening new fields of the application and research of glass-ceramics. Iron phosphate glass of the composition 40Fe2O3- 60P2O5 (mol%) was crystallized at various temperatures for various times (1, 6, 24 and 48 h). The structural changes and evolution of crystalline phases formed in glass-ceramics were studied by means of X-ray diffraction, Raman and Mossbauer spectroscopy. Depending on crystallization temperature and time three crystalline phases are found to be present in crystallized samples. Impedance spectroscopy was used for investigation of electrical conductivity over vide temperature and frequency range. In the early stage of crystallization at about first crystallization temperature, TC1, the electrical conductivity decreases as a results of formation of randomly dispersed Fe3(P2O7)2 grains and a decrease of Fe2+-Fe3+ pairs concentration in glassy phase. The temperature at which the minimum in electrical conductivity appeared strongly depends on the amount of crystallinity. Above 15% of crystallinity the electrical conductivity increases as the grains of Fe3(P2O7)2 are better defined. At second crystallization temperature, TC2, the formation of second and third crystalline phase causes further increase in the electrical conductivity. In order to distinguish between crystalline grains/residual glassy phase and grain boundary contributions the impedance spectra were fitted to equivalent circuits. It was found that although the total electrical conductivity is higher above TC2, the grain boundary contribution is low due to a large grain boundary resistance. It seems that the imperfect crystalline grain contacts in these polycrystalline samples have an effect on the grain boundary transport.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija



POVEZANOST RADA


Projekt / tema
098-0982929-2916 - Utjecaj strukture na električna svojstva (bioaktivnih) stakala i keramike (Andrea Moguš-Milanković, )
119-0982886-1009 - Struktura i svojstva posebnih nanomaterijala dobivenih suvremenim tehnikama (Antun Tonejc, )

Ustanove
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Citiraj ovu publikaciju

Moguš-Milanković, Andrea; Pavić, Luka; Skoko, Željko; Graca M.P.F.; Costa, B.F.O.; Valente, M.A;
Correlation between structural changes and electrical properties of crystallized iron phosphate glass // Book of Abstract, Borate Phosphate 2014
Prag: ICARIS Ltd., 2014. str. 116-116 (predavanje, međunarodna recenzija, sažetak, znanstveni)
Moguš-Milanković, A., Pavić, L., Skoko, Ž., Graca M.P.F., Costa, B., Valente, M. & (2014) Correlation between structural changes and electrical properties of crystallized iron phosphate glass. U: Book of Abstract, Borate Phosphate 2014.
@article{article, year = {2014}, pages = {116-116}, keywords = {Iron phosphate glass, glass-ceramics, structural changes, electrical properties}, title = {Correlation between structural changes and electrical properties of crystallized iron phosphate glass}, keyword = {Iron phosphate glass, glass-ceramics, structural changes, electrical properties}, publisher = {ICARIS Ltd.}, publisherplace = {Pardubice, \v{C}e\v{s}ka} }