Pregled bibliografske jedinice broj: 738938
Correlation between structural changes and electrical properties of crystallized iron phosphate glass
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)
CROSBI ID: 738938 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
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 Republika, 30.06.2014. - 04.07.2014
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
Projekti:
098-0982929-2916 - Utjecaj strukture na električna svojstva (bioaktivnih) stakala i keramike (Moguš-Milanković, Andrea, MZOS ) ( CroRIS)
119-0982886-1009 - Struktura i svojstva posebnih nanomaterijala dobivenih suvremenim tehnikama (Tonejc, Antun, MZOS ) ( CroRIS)
Ustanove:
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb