Oxygen potential calculations for conventional and Cr-doped UO2 fuels based on solid solution thermodynamics

In this paper, the influence of the Fe2O3 addition amount on the dephosphorization of hot metal at 1623 K with the slag of the low basicity (CaO/SiO2) of about 1.5 was investigated by using high-temperature laboratorial experiments. With increasing the Fe2O3 addition amount from 5 to 30 g, the contents of [C], [Si], [Mn] and [P] in the hot metal at the end of dephosphorization are decreased and the corresponding removal ratios increase. In dephosphorization slags, the phosphorus mainly exists in the form of the nCa2SiO4–Ca3(PO4)2 solid solution in the phosphorus-rich phase and the value of coefficient n decreases from 20 to 1. Furthermore, the oxygen potential and activity at the interface between the slag and hot metal are increased. When the oxygen potential and the oxygen activity at the interface are greater than 0.72 × 10−12 and 7.1 × 10−3, respectively, the dephosphorization ratio begins to increase rapidly. When the Fe2O3 addition amount is increased to 30 g, the ratio of the Fe2O3 addition amount to theoretical calculation consumption is around 175%, and the dephosphorization ratio reaches the highest value of 83.3%.

Download Full-text

Controlling the oxygen potential to improve the densification and the solid solution formation of uranium–plutonium mixed oxides

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2013.12.014 ◽

2014 ◽

Vol 447 (1-3) ◽

pp. 115-124 ◽

Cited By ~ 15

Author(s):

Ségolène Berzati ◽

Stéphane Vaudez ◽

Renaud C. Belin ◽

Jacques Léchelle ◽

Yves Marc ◽

...

Keyword(s):

Solid Solution ◽

Oxygen Potential ◽

Mixed Oxides ◽

Solid Solution Formation ◽

Solution Formation ◽

Uranium Plutonium

Download Full-text

Role of strain energy in solid solution thermodynamics

JOM ◽

10.1007/bf03398878 ◽

1954 ◽

Vol 6 (5) ◽

pp. 592-593

Author(s):

E. S. Machlin

Keyword(s):

Solid Solution ◽

Strain Energy ◽

Solution Thermodynamics

Download Full-text

Theoretical oxygen potential change of quaternary solid solution, Ay2+Bz3+U1−y−zO2+x, by configurational entropy calculation

Journal of Nuclear Materials ◽

10.1016/s0022-3115(00)00403-7 ◽

2000 ◽

Vol 282 (2-3) ◽

pp. 232-238 ◽

Cited By ~ 5

Author(s):

Takeo Fujino ◽

Nobuaki Sato

Keyword(s):

Solid Solution ◽

Oxygen Potential ◽

Configurational Entropy ◽

Potential Change ◽

Quaternary Solid Solution

Download Full-text

Crystalline Oxide Solid Solutions in Oxygen Potential Gradients

Zeitschrift für Naturforschung A ◽

10.1515/zna-1979-0211 ◽

1979 ◽

Vol 34 (2) ◽

pp. 192-199 ◽

Cited By ~ 61

Author(s):

H. Schmalzried ◽

W. Laqua ◽

P. L. Lin

Keyword(s):

Solid Solution ◽

Steady State ◽

Numerical Solution ◽

Solid Solutions ◽

Potential Field ◽

Oxygen Potential ◽

Transport Problem ◽

Oxide Solid Solution ◽

Crystalline Oxide ◽

Potential Gradients

Abstract The steady state demixing of an initially homogeneous oxide solid solution (A, B)O in an oxygen potential field is studied theoretically and experimentally.In case that DA > DB ≫ D0, the crystal is shifted with respect to the oxide lattice system toward the higher oxygen potential and is enriched in A at the side of the higher oxygen potential, while the transport of oxygen in the crystal is negligible. A numerical solution of the transport problem is presented, and the predicted effect is verified experimentally

Download Full-text