Annealing conditions and superconducting behaviour of Nb-based A15-type compounds

Flükiger, R.; Spitzli, P.; Heiniger, F.; Müller, J.

doi:10.1016/0375-9601(69)90331-4

Cited by 34 publications

(8 citation statements)

References 4 publications

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“…Also with PAW, D0 Au-Nb (Gold -Niobium). The phase diagram of the system Au-Nb is based on three known compounds (Au 2 Nb, Au 2 Nb 3 , AuNb 3 ) [9,10,47,117,119,[127][128][129][130][131][132][133][134][135][136][137][138][139][140][141]. We do not confirm the stability of phase Au 2 Nb-C32 [9,10,47].…”

Section: Ag-y Systemmentioning

confidence: 81%

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Accuracy of ab initio methods in predicting the crystal structures of metals: A review of 80 binary alloys

Curtarolo

Morgan

Ceder

2005

Calphad

334

320

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systems in which the ab initio method predicts that no compounds are stable). A detailed comparison to experimental data confirms the high accuracy with which ab initio methods can predict ground states. A 2 B 2 hcp superstructure for RhRu, and an A 2 B 4 hcp superstructure for RhRu 2 (Appendix (XI)). In addition, we find two new crystal structures which are not superstructures of fcc, bcc or hcp: MoZr 3 and Mo 5 Ti (for Mo 5 Ti, MoZr 5 , and Nb 5 Ru) (Appendix (XII)). II. THE LIBRARY: ALLOYS AND STRUCTURESBinary alloys. Our calculated library contains 80 binary intermetallic alloys. The alloys include the binaries that can be made from row 5 transition metals, as well as some systems with Aluminum, Gold, Magnesium, Platinum, Scandium, Sodium, Titanium, and Technetium. The alloys are: AgAu, AgCd, AgMg, where the superscript * indicates the systems in which the high throughput ab initio method predicts that no compounds are stable: 57 alloys form compounds and 23 are non compound forming.Structures and their prototypes. The library contains 176 crystal structures. Many of these have the same structure type but with different compositions of occupancies, for example, AB 3 and A 3 B (also AB and BA if the point groups of atomic positions of A and B are different), so the number of distinct prototypes is 101. The various concentrations are listed in the table below.TcZr-B2 TABLE 6: Experimentally unknown, non-identified or speculated compounds and ab initio predictions (21 entries). 48 C. Experimental solid solutions, two-phases and "not studied" regions and possible ab initio predictions Experimental non-compound ⇔ ab initio compound System Experimental resultAb initio result Ag-Au short-range order 950 • C Ag 4 Au-D1a/tie-line Ag-Au short-range order 950 • C Ag 3 Au-L1 2 /D0 23 /Al 3 Pu/NbPd 3 /D0 22 /D0 24 Ag-Au short-range order 950 • C Ag 2 Au-C37/MoPt 2 Ag-Au short-range order 950 • C AgAu-L1 0 Ag-Au short-range order 950 • C AgAu 2 -C37/MoPt 2 Ag-Au short-range order 950 • C AgAu 3 -L1 2 /D0 22 /D0 23 Ag-Cd fcc solid solution Ag 3 Cd-D0 22 /D0 24

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Section: Ag-y Systemmentioning

confidence: 81%

“…AuNb 3 . The structure AuNb 3 -A15 has been reported a number of times [9,10,[127][128][129][130][131][132][133][134][135][136][137][138][139][140][141]. In particular, Röschel et al [132] observed the A15 structure to grow in quenched samples.…”

Section: A Discussion Of Disagreement Between Experimental and Ab Ini...mentioning

confidence: 99%

Accuracy of ab initio methods in predicting the crystal structures of metals: A review of 80 binary alloys

Curtarolo

Morgan

Ceder

2005

Calphad

334

320

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“…The values for the V-Pd system are taken from [1,14] except at low Pd composition for which additional measurements have been carried out for this work (cf table 3). Similarly, in the V-Ru case, the data from Flükiger et al [15] at high Ru content have been included. We shall now briefly comment on the experimental results by first considering the disordered alloys, then the ordered phases, and the interplay between order and superconductivity, before presenting the results obtained from first-principles electronic structure calculations.…”

Section: Resultsmentioning

confidence: 99%

Electronic and phase stability properties of V–X (X = Pd, Rh, Ru) alloys

Turchi

Waterstrat

Kuentzler

et al. 2004

J. Phys.: Condens. Matter

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In this work, we f ocus on the ordered structures of V-X systems, where X=Ru, Rh, Pd, and relate the variation in the di erence of the numbers of valence electrons of the alloy c onstituents to the information contained in the constitution phase diagrams, and the electronic and stability properties. The electronic properties deduced from the low-temperature speci c heat studies are presented for the V-Ru and V-Rh systems and compared with those of y deceased 1 the V-Pd alloys for which n e w experimental results are also included. The theoretical analysis based on rst-principles electronic structure calculations con rms the measured variation of the electronic speci c heat coe cients with alloy c omposition, and predicts speci c ordering trends in the V-X systems. The superconducting properties are described for the V-X disordered alloys, the ordered V 1;x Rh x and V 1;x Ru x systems, and related to their structural instability.

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“…Hence, the metallographic investigation of the probes is of significant importance. Fltikiger et al [15] studied the structure and the superconductivity of the Nb3AuxPto_~) compounds, as well as the effect of annealing on To. They observed that the vacuum annealing at 800 ~ of Nb3Auo.TPt0.…”

Section: Introductionmentioning

confidence: 99%

The superconductivity, structure and magnetic susceptibility of Nb y Au x -Pt(1?x)A-15 type phases

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Annealing conditions and superconducting behaviour of Nb-based A15-type compounds

Cited by 34 publications

References 4 publications

Accuracy of ab initio methods in predicting the crystal structures of metals: A review of 80 binary alloys

Accuracy of ab initio methods in predicting the crystal structures of metals: A review of 80 binary alloys

Electronic and phase stability properties of V–X (X = Pd, Rh, Ru) alloys

The superconductivity, structure and magnetic susceptibility of Nb y Au x -Pt(1?x)A-15 type phases

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