Effect of Gd addition on the superconducting properties of Ti-based V, Nb, Ta alloys

Ramjan, Sk.; Chandra, L. S. Sharath; Singhl, Rashmi; Chattopadhyay, M. K.

doi:10.1016/j.supcon.2023.100048

Cited by 3 publications

(3 citation statements)

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“…Due to modernization, there is a high demand of niobium and tantalum globally in superalloy materials applied in superconductors, energy, electronics, cell phones, and energy-related fields. − These two elements along with tellurium, indium, silver, dysprosium, neodymium, and molybdenum are declared as critical metals by the European Union (EU) due to their potential strategic and sustainable energy applications including nuclear, solar, wind, carbon capture and storage. , Due to high melting point and other metallurgical properties, Nb is being used in steel to improve the latter’s mechanical strength, corrosion resistance, reduction in grain boundary, and brittleness. , The high-strength low alloy steel is largely applied in the manufacturing of vehicle bodies, railway tracks, ship hulls, and oil and gas pipelines. Due to the nontoxicity and physiological inertness, Nb and its compounds exhibit large biomedical applications related to medical implantations, pacemakers, etc. − Nb-Ta-based alloy materials have largely been utilized in the manufacturing of superconducting and magnetic materials. , The biocompatibility of the Ta-based compounds have also been explored for the production of surgical clips, metal plates, screw, and support for bone growth and joining. , …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…3 (R 4 P + ), where R 4 P + and R 2 POO − are the cation and anion part of the FIL. The proposed extraction mechanism can be given as…”

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Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Goyal,

Sengupta,

Mohapatra

2023

ACS Omega

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A 'green' single-step separation process, involving a phosphonium phosphinate functionalized ionic liquid (FIL) in C 8 mim•NTf 2 , has been developed for highly encouraging improvements in the mutual separation of Nb and Ta with a maximum separation factor of ∼48 at 2 M nitric acid. The separation factor in C 4 mim•NTf 2 was found to be somewhat lower compared to that seen in C 8 mim•NTf 2 . In C 8 mim•NTf 2 , the extraction proceeded via the neutral NbOF 3 (R 4 P + )(R 2 POO − ) and TaOF 3 (R 4 P + )(R 2 POO − ) species predominated by a 'solvation' mechanism at 2 M HNO 3 , where both the cationic and anionic parts of the FIL took part in the metal ion extraction. However, in the case of C 4 mim•NTf 2 , the extraction proceeded via a cation exchange mechanism involving the mono-positive species viz.Only the phosphinate group of the FIL was directly involved in the binding to the metal ion. The charge neutrality was maintained by the exchange of the C 4 mim + ion from the ionic liquid phase to the aqueous phase. The processes were spontaneous, exothermic involving outer sphere complexation. The radiolytic stabilities of the C 8 mim•NTf 2 -based solvent systems were poorer than those of the solvents based on C 4 mim•NTf 2 . Aqueous solutions of EDTA-guanidine carbonate or DTPA-guanidine carbonate showed promising back extraction ability though three contacts of these organic phases were required for more than 99.99% stripping of the metal ion. The reusability of these solvent systems was evaluated. After four consecutive cycles, a maximum of only 8% reduction in the extraction efficiency of Ta was noticed, while for Nb it was less than 4% for Nb.

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