Solidus and liquidus temperatures in the UO2-ThO2 system

Latta, Randall; Duderstadt, E. C.; Fryxell, R.E.

doi:10.1016/0022-3115(70)90219-9

Cited by 19 publications

(17 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the UO2 rich part, the MD calculated values slightly underestimate the ideal solidus line but the estimated values are within the error bars of experimental measurements by Böhler et al [32] (except at the 60 % composition). Our calculations suggest that the melting temperatures of UO2 and UO2-6.25 atom% ThO2 are the same, which lie between 3050 K and 3075 K. This result is in agreement with the previous experimentally determined melting temperature where a minimum in the phase diagram was found at ~ 5 mol% of ThO2 by Latta et al [30] and Böhler et al [32].…”

Section: 3supporting

confidence: 82%

“…Our MD calculated melting temperatures are also compared with previous experimental investigations by Latta et al [30] and Böhler et al [32]. These calculated melting temperatures are in very good agreement for the ThO2 rich part of the phase diagram compared to the ideal solidus line calculated using Equation 15 and experimentally determined values by Böhler et al [32].…”

Section: 3supporting

confidence: 63%

“…The measurements of Latta et al [30] in the 0-17 mole % ThO2 also show deviation from the ideal liquidus-solidus curve and this behavior would be consistent with a shallow minimum around 5 mol.% ThO2. Moreover, the high temperature phase diagram of ThO2-UO2 MOX can be constructed with the help of the melting points and enthalpies of fusion of the end members, assuming these complete solution binaries are ideal solid solutions, (i.e.…”

Section: Melting Temperatures Of (Thu)o2 and (Thpu)o2 Moxmentioning

confidence: 67%

“…High temperature phase diagram studies of the ThO2-UO2 MOX system have previously been reported by Lambertson et al [21] using a quench technique, whereas Latta et al [30] applied a thermal arrest method to determine the liquidus and solidus of MOX. The measurements of Latta et al [30] in the 0-17 mole % ThO2 also show deviation from the ideal liquidus-solidus curve and this behavior would be consistent with a shallow minimum around 5 mol.% ThO2.…”

Section: Melting Temperatures Of (Thu)o2 and (Thpu)o2 Moxmentioning

confidence: 99%

See 3 more Smart Citations

Melting behavior of (Th,U)O2 and (Th,Pu)O2 mixed oxides

Ghosh

Kuganathan

Galvin

et al. 2016

Journal of Nuclear Materials

View full text Add to dashboard Cite

The melting behaviors of pure ThO2, UO2 and PuO2 as well as (Th,U)O2 and (Th,Pu)O2 mixed oxides (MOX) have been studied using molecular dynamics (MD) simulations. The MD calculated melting temperatures (MT) of ThO2, UO2 and PuO2 using two-phase simulations, lie between 3650-3675 K, 3050-3075 K and 2800-2825 K, respectively, which match well with experiments. Variation of enthalpy increments and density with temperature, for solid and liquid phases of ThO2, PuO2 as well as the ThO2 rich part of (Th,U)O2 and (Th,Pu)O2 MOX are also reported. The MD calculated MT of (Th,U)O2 and (Th,Pu)O2 MOX show good agreement with the ideal solidus line in the high thoria section of the phase diagram, and evidence for a minima is identified around 5 atom% of ThO2 in the phase diagram of (Th,Pu)O2 MOX.

show abstract

Section: 3supporting

confidence: 82%

Section: 3supporting

confidence: 63%

Section: Melting Temperatures Of (Thu)o2 and (Thpu)o2 Moxmentioning

confidence: 67%

Section: Melting Temperatures Of (Thu)o2 and (Thpu)o2 Moxmentioning

confidence: 99%

See 2 more Smart Citations

Melting behavior of (Th,U)O2 and (Th,Pu)O2 mixed oxides

Ghosh

Kuganathan

Galvin

et al. 2016

Journal of Nuclear Materials

View full text Add to dashboard Cite

show abstract

“…Solid UO 2 and ThO 2 form a continuous series of solid solutions [35][36][37]. Lattice parameter measurements of ThO 2 -UO 2 solutions show that, within experimental accuracy, Vegard's law is obeyed.…”

Section: Discussionmentioning

confidence: 99%

Characterization of ThO2–UO2 pellets made by co-precipitation process

Kutty

Khan

Achuthan

et al. 2009

Journal of Nuclear Materials

View full text Add to dashboard Cite

Diffraction and Thermal Expansion of Solids

Tyagi

Achary

2010

Thermodynamic Properties of Solids

View full text Add to dashboard Cite

Thermal expansion of materials is a topic of age-old interest to mankind in view of the chronological development of several devices and technologies [1,2]. The concept of thermal expansion and knowledge of thermal expansion coefficient of materials remain important for any structural materials experiencing a temperature gradient. The structural materials include any material used in technology to build a mechanically or electronically integrated physical entity. In particular, the thermal properties are of interest when any structural assembly faces a temperature variation. Thermal expansion effects have been well considered right from the metals and ceramic parts of cookwares to the highly sophisticated mechanical structures, such as buildings, bridges, air/spacecraft, vessels, kilns, furnaces, and so on. In particular, metals such as steel, copper, and so on that are important structural parts show a significant expansion with temperature. Thus, in all these materials, thermal expansion was exploited either to enhance or to nullify any temperature-induced dimensional instability, for example, the utilization of thermal expansion in automatic cut-off switch using bimetals is well known. The discovery of Invar (an alloy of 35% Ni and 65% Fe) and subsequent modified compositions as Elinvar, Kovar, Alnico, and so on have found immense applications in modern technologies, such as design of high-accuracy clocks, shadow mask in television screen, and so on [3]. In addition, low thermal expansion in fused silica and controllable thermal expansion in materials with glass and glass-ceramic compositions have been discovered and used in precise optical instruments, mirror substrates, glass-metal junctions [4,5]. A large number of crystalline materials with low thermal expansion are also discovered [6]. Thermal expansion data of ceramics have been a prime consideration in the designing of electrolyte and electrodes of solid oxide fuel cells [7]. Similarly, thermal expansion data of nuclear fuel materials are significant in preventing detrimental effects of fuel-clad interaction and unwanted swelling of fuel pins [8]. Nuclear reactor performance is mainly restricted by the thermal expansion and thermal conductivity of the fuel pellets under irradiation conditions. In these j197 applications, the material property is more significant than the structural assembly and hence the structural materials are tuned as per their thermal expansion behavior. However, the thermal expansion behavior of electronic materials causing temperature-induced dimensional instability leading to circuit failure also needs to be dealt with. Considering such aspects, several Invar-type alloys and metal matrix composites are developed in recent years [9]. Thus, the thermal expansion data of any material are the first requisite for the development of most of the technologies.In general, it is known that all materials expand or contract with the rise or fall of temperature. The thermal expansion of any material is explained as a relative change in dimens...

show abstract

Solidus and liquidus temperatures in the UO2-ThO2 system

Cited by 19 publications

References 4 publications

Melting behavior of (Th,U)O2 and (Th,Pu)O2 mixed oxides

Melting behavior of (Th,U)O2 and (Th,Pu)O2 mixed oxides

Characterization of ThO2–UO2 pellets made by co-precipitation process

Diffraction and Thermal Expansion of Solids

Contact Info

Product

Resources

About