Negative temperature coefficients of electrical resistivity: the divalent liquid metals Eu, Yb and Ba

Güntherodt, H.-J.; Hauser, E.; Künzi, H.U.; Evans, R. M. L.; Evers, Jürgen; Kaldis, E.

doi:10.1088/0305-4608/6/8/011

Cited by 25 publications

(9 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect also takes place for liquid divalent metals (Ba, Eu, Yb) [17]. In fact, our data on the resistivity and TCR for the Cu-Ln melts in SRO composition region are fairly close in magnitude to the same quantities of ρ and α, measured experimentally for liquid Eu [9,17]. Earlier theoretical calculations, based on the coherent potential approximation have shown that in a model binary ordered alloy system TCR can be positive, negative or zero, depending on the location of the Fermi energy in the alloy [18].…”

Section: Discussionmentioning

confidence: 91%

“…For melts, having approximately two conduction electrons per atom, the wavevector q ∼ 2k F (k F is the wavevector Fermi) lies close to the first peak of s(q), which decreases with increasing temperature, and, therefore, determines a negative TCR [8]. This effect also takes place for liquid divalent metals (Ba, Eu, Yb) [17]. In fact, our data on the resistivity and TCR for the Cu-Ln melts in SRO composition region are fairly close in magnitude to the same quantities of ρ and α, measured experimentally for liquid Eu [9,17].…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Electrical resistivity of liquid Cu–Ce alloys

Иванов

Berezutski

2004

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 97%

Electrical resistivity of liquid Cu–Ce alloys

Иванов

Berezutski

2004

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…The resistivity of La-Gd alloys indeed seems to behave in this fashion. 5 In summary, we have shown that the temperature coefficient of p changes through the Lanthanide series from being positive for liquid La to being slightly negative for Lu. In the framework of Ziman's theory, this can be explained by an increasing value of 2& F .…”

mentioning

confidence: 66%

“…Above the melting point, p decreases with increasing temperatures. This is characteristic of the liquid divalent metals Zn, 3 Ba, 4 ' 5 Eu, 5 and Yb, 5 showing NTC, but it is rather surprising for the trivalent element Lu. In order to compute p for the Re metals by means of Eq.…”

mentioning

confidence: 95%

“…The occurrence of NTC in liquid systems such as divalent metals Ba, 4 * 5 Eu, 5 Yb, 5 and alloys of monovalent noble, 3 transition 3 (T), and rare-earth (RE) metals 5 with polyvalent metals has led to a very successful extension of this simple liquidmetal theory to T and RE metals and their alloys. For these metals, the simple NFE arguments become more suspect since the resistivities are large and the mean free path can be of the order of only twice the interatomic distance.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Evidence for Varyingd-Band Occupancy across the Trivalent Rare-Earth Series

et al. 1978

View full text Add to dashboard Cite

Thermophysical Properties of an Fe_57.75Ni_19.25Mo₁₀C₅B₈ Glass‐Forming Alloy Measured in Microgravity

2020

View full text Add to dashboard Cite

Due to their unique combination of properties, metallic glasses are of particular interest in numerous fields of engineering. [1] The much lower material cost, compared with Zr-based metallic glasses, [2] together with high corrosion and wear resistance, make Fe-based metallic glasses very attractive for industrial applications. [3] Due to the relatively small critical casting thickness of Fe-based metallic glasses (typically below 6 mm), industrial commercialization of Fe-based glass forming alloys are limited to applications such as anticorrosion or thermal-barrier coatings, applied, e.g., by spray coating methods [3,4] or laser cladding methods. [5,6] The often observed brittleness of Fe-based alloys has driven the development of Fe-based metallic glass compositions with improved ductility and glass-forming ability [7-9] and the development of bulk metallic glass matrix composites. [10-13] Previously, it was already demonstrated, that by, e.g., powder bed fusion (PBF), thermal spray additive manufacturing (TSAM), and direct energy deposition (DED) of FeCrMoCB a large variety of microstructures can be achieved: fully amorphous, dendrite-reinforced metal matrix composites, and fully crystalline. [14,15] Despite these developments, Fe-based metallic glasses have not found widespread use outside of coatings due to their exceptionally low fracture toughness in large glass-forming compositions and their reliance on volatile phosphorous in their tougher compositions. Tough Fe-based metallic glasses have been previously demonstrated in the FeNiBX system, but these are only accessible in the amorphous state through ultrarapid cooling. However, additive manufacturing of Fe-based metallic glasses will make it possible to realize bulk metallic glass parts from tough Fe-based alloys with low glass-forming ability. To avoid a time consuming, completely empirical process development for an additive manufacturing process, [15] numerical models of the fabrication process have nowadays become an essential instrument. Using the correct simulation models and precise thermophysical property data, the temperature distribution and history, fluid flows in the melt, porosity and other defect formation, as well as the formation of thermal stresses during the solidification in the additive manufacturing process can be predicted. [16] In a similar manner, this approach can also be used to improve simulation of other manufacturing processes, such as thermal spraying, laser cladding [17-20] and powder production by gas atomization [21,22] Consequently, process simulations based on precise thermophysical properties result in faster process development cycles. Such numerical simulations need not only to present the correct description of the involved physical phenomena, but they especially require the correct thermophysical properties of the alloy in the solid and liquid phases. While the relevant properties in the solid phase can be measured with commercial measurement equipment, container-based measurement methods for the liquid phase suff...

show abstract

Negative temperature coefficients of electrical resistivity: the divalent liquid metals Eu, Yb and Ba

Cited by 25 publications

References 28 publications

Electrical resistivity of liquid Cu–Ce alloys

Electrical resistivity of liquid Cu–Ce alloys

Evidence for Varyingd-Band Occupancy across the Trivalent Rare-Earth Series

Thermophysical Properties of an Fe_57.75Ni_19.25Mo₁₀C₅B₈ Glass‐Forming Alloy Measured in Microgravity

Contact Info

Product

Resources

About

Negative temperature coefficients of electrical resistivity: the divalent liquid metals Eu, Yb and Ba

Cited by 25 publications

References 28 publications

Electrical resistivity of liquid Cu–Ce alloys

Electrical resistivity of liquid Cu–Ce alloys

Evidence for Varyingd-Band Occupancy across the Trivalent Rare-Earth Series

Thermophysical Properties of an Fe57.75Ni19.25Mo10C5B8 Glass‐Forming Alloy Measured in Microgravity

Contact Info

Product

Resources

About

Thermophysical Properties of an Fe_57.75Ni_19.25Mo₁₀C₅B₈ Glass‐Forming Alloy Measured in Microgravity