In this study, TiAl alloy with nominal composition of Ti-43.5Al-6V-1Cr was fabricated by inductive skull melting technology. Microstructure evolution and microstructure formation mechanism were invested by quenching experiments. The results show that Ti-43.5Al-6V-1Cr alloy consists of lamellar colony (α2/γ), isolated γ phase and B2 phase. Phase transition equations and reaction temperatures during

The results of magnetic and electrical measurements of ZnCr2S4 – nanoparticles (NPs) synthesized by mechanical alloying method showed an almost ideal paramagnetic state with the weak ferromagnetic short-range interactions derived from a small positive paramagnetic Curie-Weiss temperature of θ = 0.9 K and the presence of magnetic NPs confirmed by the significantly lower value of the effective magnetic

Tm:Gd2SrAl2O7 (Tm:GSAO) crystal was grown by the Czochralski method. The Raman, absorption and fluorescence spectra of Tm:GSAO crystal were investigated. With a 50 W fiber-coupled laser diode as the pump source, the continuous wave (cw) laser action of Tm:GSAO crystal was demonstrated. The maximum average output power of 3.89 W at ∼1950 nm with a slope efficiency of 53.4% was achieved in a 5-mm-thick

Owning to exceptional optical and physicochemical properties, lanthanide-doped inorganic dual-mode luminescence materials are regarded as promising platform for multifunctional applications. Herein, a facile hydrothermal method is used to integrate Ce3+ and Nd3+ ions co-doped NaLuF4 phosphors, achieving dual-mode with ultraviolet (UV) and the second near-infrared (NIR-II) luminescence from single particles

SiO2-coated FeSiAl absorbents were prepared by StÖber method. The microstructure, complex permittivity and complex permeability of the samples synthetized with different tetraethyl orthosilicate (TEOS) content were systematically explored. The results show that the microwave absorption properties of the SiO2-coated FeSiAl absorbents were enhanced significantly by controlling the TEOS content. The sample

We studied the growth behavior, structural, electronic, and magnetic properties of cobalt nitride (Co-N) thin films deposited using direct current (dc) and high power impulse magnetron sputtering (HiPIMS) processes. The N2 partial gas flow (RN2) was varied in close intervals to achieve the optimum conditions for the growth of the tetra cobalt nitride (Co4N) phase. We found that Co-N films grown using

Lithium-oxygen batteries (LOBs) with superior energy density are recognized as a promising next-generation energy storage device for electric vehicles. However, the morphology and particle size of Li2O2 as well as the parasitic products Li2CO3 give an essential impact on electrochemical properties. To address these issues, a free-standing Co3O4[email protected] electrode with Co3O4-NiO heterostructure

The severe shuttle effect and sluggish conversion kinetics of lithium polysulfides impede the commercialization of lithium/sulfur (Li/S) batteries. To address this issue, a composite consists of Co-doped oxygen-deficient TiO2 coated by carbon layer (Co/TiO2-x@carbon) is proposed as a high-performance sulfur host. It was fabricated by one-step hydrothermal synthesis, follow by chemical vapor deposition

As an emerging technology, nanoscale non-volatile memory technology can be used for in-memory computing and neuromorphic computing. However, the deeper understanding of the charge transport and resistive switching mechanism in memristor devices are still needed to improve the device properties for practical application. Herein, we first synthesized the MoO3 nanorods and studied the structural properties

We detected a crossover from negative to positive thermal expansion with increasing Mn in HoCo2Mnx below the Curie temperature through high quality neutron diffraction measurements from 5 K to 400 K. Almost isotropic zero thermal expansion with coefficient of thermal expansion αl =－4.894×10-7/K was achieved over a large range of temperature from 5 K to TC = 225 K in the compound HoCo2Mn0.5. While the

The design and fabrication of transition metal oxides (TMOs) anode with superior lithium storage performance remains a challenge. Herein, we demonstrate one-pot hydrothermal method combined with post-calcination for the construction of interconnected porous N-doped carbon-coated cobalt/iron oxides nanocomposite ([email protected]) as lithium-ion batteries (LIBs) anode. This facile approach gives [email protected]

Li2MnO3 is the parent compound and a component of the well-studied Li-rich Mn-based layered materials (xLi2MnO3·(1−x)LiMO2) for high capacity Li-ion batteries. Different combinations of citric acid fuel and metal nitrates (C/N) were used to optimize the electrochemical performance of Li2MnO3 nanoparticles by the solution combustion synthesis. Thermodynamic modelling and thermogravimmetric analysis

Introducing multicomponent nanoparticles can improve remarkably de/hydrogenation kinetic properties of MgH2. In this work, the original core-shell [email protected] bimetallic nanoparticles were obtained via hydrothermal and calcination reduction technology. MgH2-8 wt.% [email protected] starts to dehydrogenate at 173 oC with the dehydrogenation capacity of 5.83 wt.% within 1800 s at 275 oC. Moreover

A comparatively new and important cost and time effective Polyol method has been utilized for the preparation of FeS2nanoparticles (NPs), while their crystallite size, bonding as well as nearest neighbor atomic information was obtained from XRD, FTIR, Mössbauer, FE-SEM, EDX spectroscopy techniques. The average crystallite size was found to be ∼ 28 nm and a very small tangential strain due to the spherical

The nature of the non-magnetic to paramagnetic transition of Co3+ oxide LaCoO3 was strongly disputed in the literature for many decades from a low-spin (LS) state below 20 K and to a mixed LS state and high-spin (HS) state or an intermediate-spin (IS) state above 100 K. In this context, the layered perovskite LaSrCoO4 is more favorable for a Jahn-Teller-active IS state because of an elongated distortion

The characteristics of the electronic and phonon subsystems of lanthanum tetraboride (LaB4) studied using first-principles calculations. The calculated lattice parameters, as well as the positions of atomic, are satisfactorily consistent with the experimental data. The partial densities of states, band structure, Fermi surface, phonon dispersion curve of LaB4 are calculated and analysed. The reliability

In the present work, catalyst free GaN nanowires were grown on Si (111) substrates by plasma assisted molecular beam epitaxy followed by chemical vapour deposited few layers MoS2. The morphology of the GaN nanowires and MoS2/GaN were studied using scanning electron microscopy. The vibrational properties of MoS2/GaN nanowires/Si (111) substrates were analysed using Raman spectroscopy. The difference

Anode materials for Lithium-Ion Batteries (LIBs) based on Mo- and V-doped maghemite were prepared by the sol-gel route. High-Resolution Transmission Electron Microscopy (HRTEM) showed the formation of isotropic nanoparticles. The X-ray Photoelectron Spectroscopy (XPS) revealed the presence of Fe3+ and Mo6+ or V4+ for Mo- or V-doped samples, respectively. Rietveld refinement of X-ray Diffraction (XRD)

First principles calculations based on different substitution models are performed to investigate the structural, elastic, thermodynamic, and electronic properties of body-centered cubic (bcc) Zr-Nb alloy which has great potential in biomedicine and nuclear power in the whole interval of concentration. The results show that the calculated lattice parameters decrease linearly with the increase of Nb

The room temperature fabrication of amorphous oxide semiconductor thin film transistors (TFTs) is essential for their applications in flexible electronics due to the low glass-transition temperatures of flexible substrates. High performance In-Al-Zn-O (IAZO) TFTs with a homogeneous dual-active-layer structure are successfully fabricated at room temperature. The electrical properties including bias

As an environment-friendly technique, the water-based solution process has attracted numerous attention. Due to the ability to fabricate oxide semiconductor films for transistors with acceptable electric properties at relatively low temperatures (~200 °C lower compared with organic solvent), it has great potential in future display technology, and various correlation technologies are keeping emerging

In this paper, a new preparation method of metal matrix composites is presented. The W/FeNiMnAlW high-entropy alloy (HEA) matrix composite materials have been prepared by a simple and efficient technology. The HEA matrix consists of a face-centered cubic (FCC) phase, an ordered body-centered cubic (BCC) phase and W2C phase. The volume fraction and average grain size of the reinforcing phase W particles

Double perovskite La1.8Sr0.2CoFeO5+δ (DP-LSCF) is prepared by a modified sol-gel method and investigated as a cathode material for intermediate temperature solid oxide fuel cells (IT-SOFCs, 600–850 °C). The compound is characterised by a variety of techniques, including TG/DTA, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and SEM-EDS. The formation of the double perovskite

Two lightweight Al2O3-C refractories containing microporous corundum aggregates were fabricated by using flake graphite and microcrystalline graphite as the carbon source. The effect of these carbon sources on the microstructure and mechanical properties of lightweight Al2O3-C refractories with a silicon additive was then investigated. Using microcrystalline graphite resulted in more SiC whiskers in

The hollow SiC microtubes were designed and prepared by the de-template of SiC/CF coaxial materials to enhance the electromagnetic wave absorption bandwidth of the SiC materials. The XRD, Raman, and TEM results indicated that the hollow SiC microtubes were composed of SiC, C, and amorphous SiO2 layers. The carbon particles uniformly embedded in the SiC particles and the amorphous SiO2 covered the outside

We have studied the crystallization kinetics of pyrochlore Bi2Ti2O7 (BTO) from 0.25Bi2O3-TiO2-0.25Na2O-SiO2 (BTNSO) glass under isothermal and non-isothermal conditions. On the course of crystallization, only BTO crystal within the confined size under 100 nm is formed and the rest of the components of as-quenched BTNSO glass remains as a remanent glass even at the final stage of crystallization. The

This study presents dielectric properties investigation of hafnium oxide (HfOx), aluminum oxide (AlOx) and tantalum oxide (TaOx) thin films and HfAlTaOx compound based on their multilayer structure. The thickness of all films under study was 40 nm. The investigated films were produced from metal-organic precursors by Plasma Enhanced Atomic Layer Deposition (PEALD). Based on the dielectrics mentioned

Substitutional doping is the prominent way to modify the photoanode of the photoelectrochemical system by which its response to solar spectrum can be manipulated. Here, we introducing the transition metal Cr into the CdSe host lattice to investigate the photoelectrochemical (PEC) performance. The Cr doped CdSe thins films were deposited by periodic cyclic voltammetry method. XRD and Raman spectroscopy

Lithium-sulfur (Li–S) batteries are considered promising candidates for next-generation energy storage devices due to their ultrahigh theoretical gravimetric energy density, cost-effectiveness, and environmental friendliness. However, the application of Li–S batteries remains challenging; mainly due to a lack of understanding of the complex chemical reactions and associated equilibria that occur in

The engineering of grain boundaries (GB) by controlled twin boundaries introduction in the copper matrix is a promising way to achieve higher strength coupled with sufficient ductility and conductivity of copper materials being in a high demand for modern electronics. In the work, the oversized Bi atoms were introduced in the copper film using two step direct current (DC) electrodeposition technique

This study aims to investigate the influence of the introduction of S-doped GO in the active layer on the performance of wire mesh Ti/Ce-Mn/SnO2-Sb-La electrodes, Ti/Ce-Mn/SnO2-Sb-La electrodes, Ti/Ce-Mn/SnO2-Sb-La-rGO electrodes and Ti/Ce-Mn/SnO2-Sb-La-S-rGO electrodes, based on the wire mesh titanium. These were prepared and compared by sol-gel and thermal oxidation. Compared with the wire mesh Ti/Ce-Mn/SnO2-Sb-La

SiC coating on graphite flake (Gf) was prepared by SiO2 sol-gel method combining with in-situ reaction. Then, the SiC coated graphite flakes reinforced 6063Al ([email protected]f/6063Al) composites were fabricated by vacuum hot pressing method. The results demonstrated that the SiC coating with a thickness of about 15 nm on the Gf could effectively improve the wettability, reduce the interface thermal

Boron carbide BxC (x=1/6−10) powders were synthesized through a microwave-assisted carbothermic reduction reaction as a potential clean energy material. Their crystallographic structures and optical properties were characterized. X-ray diffraction and electron diffraction indicated that the synthesized BxC powders were amorphous. Electron energy-loss spectroscopy demonstrated that the composition of

The effects of the microwave (MWT), hydrothermal (HTT) and mechanochemical treatments (MChT) on the structure and physicochemical properties of TiO2 precipitated from titanium sulfate and chloride were investigated. The obtained materials were characterized using the N2 adsorption/desorption, XRD and XRF analysis, FTIR and UV-Vis spectroscopy. Photo- and mechanocatalytic properties of the samples were

The martensitic transformation of Ni49.5Ti35.5Hf15 high temperature shape memory alloy is characterized by internal friction measurements. The temperatures for the reversible B2 ↔ B19’ transformation appear in the range 410−479 K on cooling and 447−526 K on heating. In addition, a strong anomalous pre-martensitic softening of the dynamic modulus is reported in the high-temperature phase, between 850

High entropy alloys represent a new type of materials with a unique combination of physical properties originating from the occurrence of single-phase solid solutions of numerous elements. The preparation of nanostructured or amorphous structure in a form of thin films promises increased effective surface and high intergranular diffusion of elements as well as a high affinity to oxidation. In this