Lattice effects in the light actinides

Lawson, A.C.; Cort, B.; Roberts, J.A.; Bennett, B. I.; Brun, T. O.; Dreele, Robert B. Von; Richardson, J. W.

doi:10.2172/314148

Cited by 2 publications

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“…Atomic number Figure 1. The variation of the atomic volume for the actinide series (from Lawson [3]). …”

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confidence: 99%

“…It is important to note that these light actinides all melt from the bcc structures which appeal to make this series unique. [3] We have tabulated the ratio BΩ=k B T m ; for which the experimental measurements for the above quantities for these less common metals which are known, in Table 1. As may be observed, the behaviour of this ratio is very different from that found in the heavy rare earths.…”

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Electron correlation effects reflected in thermodynamic properties of light actinides

Matthai

March

2016

Physics and Chemistry of Liquids

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“…Atomic number Figure 1. The variation of the atomic volume for the actinide series (from Lawson [3]). …”

Section: Disclosure Statementmentioning

confidence: 99%

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confidence: 99%

Electron correlation effects reflected in thermodynamic properties of light actinides

Matthai

March

2016

Physics and Chemistry of Liquids

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“…Several tetrahedrally bonded elements, such as Si, Ge, and so on, and amorphous silica also exhibit negative thermal expansion at low temperatures [156]. Negative thermal expansions in f-block elements such as Pu and Ce have also been reported [158,159]. Negative thermal expansion coefficients in polymeric structures such as elastomers and crystalline polyethylene are also known.…”

Section: Positive and Negative Thermal Expansions J213mentioning

confidence: 99%

“…The two phases can have difference in the thermophysical properties due to the intrinsic internal arrangement of atoms. The low or negative thermal expansion in several metals such as Pu, U, and Ce are explained with this effect [158,159]. In both the cases, the materials develop stress leading to a damaged mechanical integrity.…”

Section: Phase Transitions (Magnetic and Electronic Transitions)mentioning

confidence: 99%

Diffraction and Thermal Expansion of Solids

Tyagi

Achary

2010

Thermodynamic Properties of Solids

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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...

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Lattice effects in the light actinides

Abstract: Portions of this document may be illegible in electronic image products. Images are produced from the best available original document.

Cited by 2 publications

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Electron correlation effects reflected in thermodynamic properties of light actinides

Electron correlation effects reflected in thermodynamic properties of light actinides

Diffraction and Thermal Expansion of Solids

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