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

2000 ◽  
Vol 663 ◽  
Author(s):  
Mogus-Milankovic ◽  
K. Furic ◽  
D. E. Day
Keyword(s):  
Ionic Conduction ◽  
Iron Phosphate ◽  
Chemical Durability ◽  
Phosphate Glasses ◽  
Dc Conductivity ◽  
Thermally Stimulated Current ◽  
Oxygen Ions ◽  
Cesium Ions ◽  
Cesium Concentration ◽  
Iron Phosphate Glasses

ABSTRACTThe 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.

DC conductivity of semiconducting iron phosphate glasses

1973 ◽  
Vol 19 (2) ◽  
pp. K125-K128 ◽  
Author(s):  
L. Murawski ◽  
O. Gzowski
Keyword(s):  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Dc Conductivity ◽  
Iron Phosphate Glasses

Structure and chemical durability of calcium iron phosphate glasses doped with La2O3 and CeO2

2019 ◽  
Vol 516 ◽  
pp. 50-55 ◽  
Author(s):  
Qingshun Shi ◽  
Yunlong Yue ◽  
Ya Qu ◽  
Shiquan Liu ◽  
G.A. Khater ◽  
...  
Keyword(s):  
Iron Phosphate ◽  
Chemical Durability ◽  
Phosphate Glasses ◽  
Calcium Iron ◽  
Iron Phosphate Glasses

Speciation of sulphate ions in sodium alumino(iron)phosphate glasses

2019 ◽  
Vol 512 ◽  
pp. 81-89 ◽  
Author(s):  
S.V. Stefanovsky ◽  
O.I. Stefanovsky ◽  
I.L. Prusakov ◽  
M.I. Kadyko ◽  
A.A. Averin ◽  
...  
Keyword(s):  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses

The Effect of Electron Irradiation on the Structure of Sodium Aluminum-Iron Phosphate Glasses

MRS Advances ◽  
2016 ◽  
Vol 1 (63-64) ◽  
pp. 4227-4232 ◽  
Author(s):  
S.V. Stefanovsky ◽  
O.I. Stefanovsky ◽  
M.I Kadyko ◽  
V.A. Zhachkin ◽  
L.D. Bogomolova
Keyword(s):  
Room Temperature ◽  
Structural Evolution ◽  
Iron Phosphate ◽  
Esr Spectra ◽  
Phosphate Glasses ◽  
Water Molecules ◽  
Oxygen Hole ◽  
Bending Modes ◽  
Iron Phosphate Glasses ◽  
Hole Centers

ABSTRACTGlasses of the series (mol.%) 40 Na2O, (20-x) Al2O3, x Fe2O3, 40 P2O5 were irradiated with 8 MeV electrons to doses equivalent of 0.1, 0.5, and 1.0 MGy and characterized by FTIR spectroscopy and ESR at room temperature. FTIR spectra of all the glasses consist of strong bands due to O-P-O stretching modes in (PO4)3- and (P2O7)4- units at 1000-1200 cm-1, P-O-P stretching modes at 900-950 cm-1 (νas) and 700-750 cm-1 (νs), and bending modes in the PO4 units. The wavenumber range lower 800 cm-1 has some contribution due to stretching modes in MO4 and MO6 (M = Al, Fe) units. Moreover the bands at 3300-3700 cm-1 and 1550-1650 cm-1 due to stretching and bending modes in both absorbed and structurally bound H2O molecules were present. As irradiation dose increases the bands due to stretching and bending modes in water molecules and M-O-H bonds become stronger and are split. No essential changes with increasing dose were observed within the spectral range of stretching modes of the O-P-O and P-O-P bonds. Irradiation yields phosphorus-oxygen hole centers - PO42- (D5) and PO42- (D6), and PO32- ion-radicals (D2) observable in ESR spectra of low-Fe glasses. At x>5 their responses are overlapped with strong broad line due to Fe(III). On the whole, with the increase in iron content the glass structural evolution decrease.

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