Naslov
Electrical Conductivity and Structural Properties of Cesium Iron Phosphate glasses: A Potential Host for Vitrifying Nuclear Waste

Autori
Moguš-Milanković, Andrea ; Furić, Krešimir ; Day, Delbert E.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Symposium Proceedings Volume 663 / Hart, Kaye P.; Lumpkin Gregory R. - Sydney : Materials Research Society, 2001

Skup
Scientific Basis for Nuclear Waste Management XXIV

Mjesto i datum
Sydney, Australija, 27.08.2000. - 31.08.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
iron phosphate glasses; dc conductivity; nuclear waste

Sažetak
The thermally stimulated current (TSC) and dc conductivity for iron phosphate glasses containing up to 28 mol% Cs2O have been measured in a temperature range from 120 to 400 K. The dc conductivity and activation energy were constant and independent of Cs2O content. With increasing cesium concentration in cesium iron phosphate glasses the slowly moving cesium ions are more tightly bound to the non-bridging oxygen ions and make no measurable contribution to dc conductivity. The dc conduction in these glasses is totally electronic, controlled by electron hopping between iron ions. The ionic conduction is immeasurably small because of the low mobility of the cesium ions. This agreement is reinforced by the excellent chemical durability of the glasses, where the dissolution rate at 90oC changes little with increasing Cs2O content. Raman spectroscopy indicated that the structure of these glasses was composed of predominantly pyrophosphate (P2O7) groups, but the metaphosphate chains (PO3) also existed.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA