Rare Metals

https://link.springer.com/journal/12598

List of Papers (Total 30)

Electrochemical performance of Al2O3 pre-coated spinel LiMn2O4

Al2O3-coated spinel LiMn2O4 cathode materials, presintered LiMn2O4 (P-LMO), and calcined LiMn2O4 (C-LMO) were synthesized by chemical deposition and thermal treating method using presintered and calcined LiMn2O4 as precursors. The crystal structure, morphology, the thickness of the coating layer, and particle size of prepared samples were investigated by X-ray diffraction (XRD...

Synthesis and thermoelectric properties of Rashba semiconductor BiTeBr with intensive texture

Bismuth tellurohalides with Rashba-type spin splitting exhibit unique Fermi surface topology and are developed as promising thermoelectric materials. However, BiTeBr, which belongs to this class of materials, is rarely investigated in terms of the thermoelectric transport properties. In the study, polycrystalline bulk BiTeBr with intensive texture was synthesized via spark plasma...

High-temperature formation phases and crystal structure of hot-pressed thermoelectric compounds with chalcopyrite-type structure

In this study, we introduced the temperature-dependent formation phases and crystallographic parameters of hot-pressed silver gallium telluride AgGaTe2 and copper gallium telluride CuGaTe2 with chalcopyrite structure from 300 to 800 K. These two compounds are potential thermoelectric materials in the intermediate temperature range; however, the temperature-dependent formation...

High-performance anode materials for Na-ion batteries

Na-ion batteries are considered a promising alternative to Li-ion batteries for large-scale energy storage systems due to their low cost and the natural abundance of Na resource. Great effort is making worldwide to develop high-performance electrode materials for Na-ion batteries, which is critical for Na-ion batteries. This review provides a comprehensive overview of anode...

Anode material NbO for Li-ion battery and its electrochemical properties

The NbO electrode materials were successfully synthesized by high-temperature solid-phase method using Nb powders and Nb2O5 powders as raw materials. The crystalline structure, morphology, and electrochemical properties of the obtained materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), dynamic light scattering instrument (DLSA), half-cell...

Electrodeposition of nanostructured Ti/(Ru + Ti + Ce)O2 coatings

A nanostructured ternary coating of Ti/(Ru + Ti + Ce)O2 was prepared by the conventional electrodeposition on the titanium substrate as the cathode with different numbers of coating layers. The main objective of this work was to study nanostructured coatings of ceramic materials. For this purpose, the amount of precursor materials in the electrolyte was a variable parameter...

Magnetocaloric effect of LaFe11.35Co0.6Si1.05 alloy

The aim of the present paper was to study the large magnetocaloric effect observed in LaFe11.35Co0.6Si1.05 alloy. X-ray diffraction (XRD) result reveals a coexistence of two crystalline phases: a dominant La(Fe,Si)13-type and a minor α-Fe(Co,Si). It is confirmed by the Mössbauer spectroscopy and microstructural observations accompanied by an energy-dispersive spectroscopy (EDS...

Magnesium hydroxide whisker modified via in situ copolymerization of n-butyl acrylate and maleic anhydride

Magnesium hydroxide (MH) whiskers were modified via in situ polymerization of n-butyl acrylate and maleic anhydride. Sodium dodecyl sulfonate was used as emulsifier. The modifying effect was evaluated by using contact angle and activation index. The thermal stability, functional groups, structure, morphology, phase composition and surface element valence of MH whiskers were...

Structure and properties of indium-doped ZnO films prepared by RF magnetron sputtering under different pressures

High conductive and transparent In-doped ZnO thin films were deposited on glass substrates by radio-frequency (RF) magnetron sputtering at 250 °C. Argon gas was used as the sputtering gas, and its pressure varies from 0.1 to 4.0 Pa. The influences of deposition pressure on the structural, electrical and optical properties of the films were investigated by means of X-ray...

Solid-phase extraction gold from alkaline cyanide solution with quaternary ammonium surfactant

The solid-phase extraction (SPE) technique applied to the extraction of organic compound was creatively used as the extraction of inorganic gold in the paper. Two types of techniques were proposed and explored, namely the SPE and the liquid–liquid extraction (LLE) of the quaternary ammonium surfactant [cetytrimethyl ammonium bromide (CTMAB), cetyl pyridine bromide (CPB), benzyl...

Growth of N-polar GaN on vicinal sapphire substrate by metal organic chemical vapor deposition

The growth and properties of N-polar GaN layers by metal organic chemical vapor deposition (MOCVD) were reported. It is found that N-polar GaN grown on normal sapphire substrate shows hexagonal hillock surface morphology. With the misorientation angles increasing from 0.5° to 2.0° toward the a-plane of the sapphire substrate, the number of the hillock becomes less and less and...

Progress in application of rare metals in superalloys

Rare metals play an important role in development of superalloys. Over the last two decades, the application of the rare metals in superalloys has achieved progress significantly. They present multi-beneficial effects for strengthening the matrix and the γ′ phase, increasing the lattice misfit, cleaning the grain boundary, improving the carbides and eutectics, refining the grain...

Modified calcination conditions of rare alkali metal Rb-containing muscovite (KAl2[AlSi3O10](OH)2)

Muscovite mineral was roasted in different conditions. Rubidium leaching rate was a standard to examine the impact of various factors on calcination effect, including the agent types, roasting time, mass ratio, and roasting temperature. The results indicate that the best agent is the combination of sodium chloride and calcium chloride, and its mass ratio of muscovite/NaCl/CaCl2...

Ni–B-doped NaAlH4 hydrogen storage materials prepared by a facile two-step synthesis method

By directly introducing Ni–B into NaAlH4 system using a facile two-step synthesis method, the effects of Ni–B on NaAlH4 were systematically investigated. NaAlH4 can be completely formed after 30 h milling under 1 MPa hydrogen pressure. In addition, the dehydrogenation kinetics of as-prepared NaAlH4 after different milling times were investigated. As the dehydrogenation...

Technology of dehydration and transformation of silicic acid

The technology that silicic acid was pressurized under high temperature in order to dehydrate and transform was investigated in the paper. The effects, such as the ratio of liquid to solid, pressure, temperature, and reaction time on the dehydration rate and volume shrinkage rate, were researched. The experimental results show that the dehydration rate of silicic acid is up to 41...

Homogenization heat treatment of 2099 Al–Li alloy

The microstructure evolution and composition distribution of as-cast and homogenized 2099 aluminum–lithium (Al–Li) alloy were studied by optical microscopy (OM), differential thermal analysis (DTA), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), area and line scanning, X-ray diffraction (XRD), and Vickers microhardness test methods. The results show...