Systematic improvements in transmon qubit coherence …
Our surface-encapsulated niobium qubit devices exhibit T1 relaxation times 2–5 times longer than baseline qubit devices with native niobium oxides.
Tantalum Niobium Surface
Niobium/tantalum-based materials: Synthesis and …
The ideal morphologies can enlarge the specific surface area, which can shorten the diffusion distance between the ions, ensuring a fast transfer pathway for the …
Chemical Profiles of the Oxides on Tantalum in State of the …
In this work, the chemical profile of the surface of tantalum films grown on c-plane sapphire using variable energy X-ray photoelectron spectroscopy (VEXPS) is …
New material platform for superconducting transmon qubits …
Here, we fabricate two-dimensional transmon qubits that have both lifetimes and coherence times with dynamical decoupling exceeding 0.3 milliseconds by replacing …
Tantalum
An oxide layer which forms on the surface of tantalum can act as an insulating (dielectric) layer. Because tantalum can be used to coat other metals with a very thin layer, a high capacitance can be achieved in a small volume. ... There are several complicated steps involved in separating the tantalum from the niobium. A lot of tantalum is ...
Tantalum and Niobium | Business Segments | JX Advanced …
TANIOBIS is one of the world's leading suppliers of tantalum and niobium powders and other products used in capacitors, semiconductor materials, and surface acoustic wave (SAW) devices. Its excellent product lineup is backed …
Science Highlight – SQMS Center
The Impact: Understanding the structural and chemical properties of surface oxides is crucial for superconducting qubit performance improvement. ... Citation: Oh, J.-S. et al., Structure and Formation Mechanisms in Tantalum and Niobium Oxides in Superconducting Quantum Circuits.
Niobium and tantalum
Niobium and tantalum are transition metals that are almost always found together in nature because they have very similar physical and chemical properties. Their properties of hardness, conductivity, and resistance to corrosion largely determine their primary uses today. The leading use of niobium (about 75 percent) is in the production of high …
Systematic Improvements in Transmon Qubit Coherence …
We present a novel transmon qubit fabrication technique that yields systematic improvements in T$_1$ relaxation times. We fabricate devices using an …
Improving the work function of the niobium surface of SRF …
Detailed studies of plasma processed niobium surface were conducted. The results showed that plasma processing using reactive oxygen is very effective to remove hydrocarbons from the niobium surface. Studies showed that such plasma processing increases the work function of the niobium surface systematically in the …
A review on extractive metallurgy of tantalum and niobium
The approach consists of several sequential steps involving tantalum and niobium leaching, solutions purification, precipitation, calcination and final recovery of high purity metals as oxides. However, ... surface complexation and ion exchange, which has directed the design of various functionalized adsorbents for critical metals recovery ...
Tantalum and Niobium-Based Capacitors
This book provides a comprehensive analysis of the science, technology, and applications of Tantalum and Niobium-based capacitors. The author discusses fundamentals, focusing on thermodynamic stability, major degradation processes and conduction mechanisms in the basic structure of Me-Me2O5-cathode (Me: Ta, Nb). …
Superconductivity of Tantalum, Niobium and Lanthanum …
The properties of superconducting transition metal tunnel junctions are sensitive to the methods of junction preparation. The derivatives of a tantalum‐silver junction made by a sputtering method clearly show much poorer gap and phonon induced characteristics than a junction made on an outgassed surface.
Surface and Coatings Technology
The application of Thermo-reaction deposition and diffusion(TRD)technology has been successfully employed to fabricate tantalum carbide coatings on the surface of graphite.A unique intermediate reaction process has been identified during the formation of tantalum carbide coatings, which differs from the …
The surface energies of solid molybdenum, niobium, tantalum and
The surface energies of solid molybdenum, niobium, tantalum, and tungsten at 1500 °C have been determined using the multi-phase equilibration technique. The values obtained were 2050, 2550, 2680 and 2830 erg/cm 2, respectively.
A niobium and tantalum co-doped perovskite cathode for solid
Sluggish activity of cathode materials impedes operation of solid oxide fuel cells at low temperatures. Here, the authors report a niobium and tantalum co-doped perovskite cathode exhibiting high ...
Tantalum Oxides
The specific surface area of tantalum oxide and niobium oxide is nominally about 3 or 2 m 2 /g, respectively. The way in which ammonia solution is added to tantalum or niobium strip solutions is also important for the quality of …
Understanding the Tantalizing Benefits of Tantalum for …
The scientists hypothesized that the thickness and chemical nature of this tantalum oxide layer played a role in determining the qubit coherence, as tantalum has a …
Effect of Adsorbed Water Molecules on the Surface Acidity of Niobium …
Niobium oxides and tantalum oxides are typical solid acid catalysts that exhibit high activity and high water-resistance in the aqueous environment. To understand their acid catalytic performance, ...
Fluoride-Free Processing of Columbite Concentrate for
Niobium and tantalum extraction industries heavily depend on fluoride chemistry for metal oxide production. This study concentrates on developing a fluoride-free approach utilizing alkali treatment for selective dissolution of niobium and tantalum phases. The application of microwave heating in the alkali treatment of columbite …
Phys. Rev. B 1, 373 (1970)
Abstract. The band structures and Fermi surfaces of niobium and tantalum have been calculated via the augmented-plane-wave (APW) method. Relativistic effects have …
Niobium and Tantalum | SpringerLink
Tantalum and niobium, two corrosion resistant metals, form alloy in all proportions. The presence of even small amounts of niobium, like <5%, in tantalum greatly reduces the corrosion resistance of the later. ... (foil, wire, or powder sintered); (b) the tantalum oxide dielectric surface (anodic oxidation of the surface of the tantalum …
Systematic improvements in transmon qubit coherence enabled by niobium
Our surface-encapsulated niobium qubit devices exhibit T1 relaxation times 2–5 times longer than baseline qubit devices with native niobium oxides. When capping niobium with tantalum, we obtain median qubit lifetimes above 300 μs, with maximum values up to 600 μs.
Tantalum surface oxidation: Bond relaxation, energy …
The Ta(100) surface and Ta(110) surface were both modeled with a periodic consisting of 3 layers, the Ta(111) surface was modeled 4 layers. ... Corrosion behavior of niobium, tantalum and their alloys in hot hydrochloric and phosphoric acid solutions. Int. J. Refract. Metals Hard Mater., 18 ...
Structure and Formation Mechanisms in Tantalum and …
Recent advancements have shown that replacing niobium (Nb) with tantalum (Ta) as the base metal significantly increases T 1, likely due to a less lossy native …
Structure and Formation Mechanisms in Tantalum and Niobium …
Improving the qubit's lifetime (T1) is crucial for fault-tolerant quantum computing. Recent advancements have shown that replacing niobium (Nb) with tantalum (Ta) as the base metal significantly increases T1, likely due to a less lossy native surface oxide. However, understanding the formation mechanism and nature of both surface …
The surface energies of solid molybdenum, niobium, tantalum and
The surface energies of solid molybdenum, niobium, tantalum, and tungsten at 1500 °C have been determined using the multi-phase equilibration technique. The values obtained were 2050, 2550, 2680 and 2830 erg/cm 2, respectively. The grain boundary energy/surface energy ratios for the four metals varied from 0.28 to 0.38 with …
High-Purity Spherical Tantalum Powder for Additive …
The purification of tantalum begins with refinement from ores including columbite, tantalite, pegmatite, and wodginite [8]. These ore materials contain a mixture of tantalum (Ta), niobium (Nb), lithium, iron, manganese, and beryllium with lower levels of other metallic and semi-metallic elements [9, 10].
Materials Proceedings | Free Full-Text | Niobium Oxide and Tantalum
Niobium and tantalum-based oxides were recovered from mining tailings. These oxides were used as starting material for growing micro- and nanostructures by the evaporation method. The morphology and crystal structure of the final oxides were evaluated using X-ray diffraction (XRD), micro-Raman spectroscopy, and scanning electron microscopy …
Melting-point density and surface free energy for liquid …
The capillary constants have been determined by the hanging-drop method for liquid vanadium, niobium, and tantalum, while the density has been determined from the indirect determination of the volume of the detached part of a hanging drop, from which the specific surface free energy has been calculated. The values are compared with published ones.
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