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  • MAX phase materials are novel layered carbon-nitride inorganic non-metallic materials with the electrical and thermal conductive qualities of metals Wurtzite Boron Nitride (wBN) is a wide band gap BN polymorph with unique mechanical properties such as hardness and stiffness. Initially synthesized in 1963 by transforming hexagonal BN (hBN) under high temperature and pressure conditions, wBN can now be stabilized at atmospheric pressure to obtain high-quality samples. Our first-principles study investigates the electronic, vibrational, and optical properties of wBN across a broad range of pressures. We account for the electron-hole interaction What is Wurtzite Boron Nitride?Wurtzite Boron Nitride (wBN) is a wide band gap BN polymorph with unique mechanical properties such as hardness and stiffness. Initially synthesized in 1963 by transforming hexagonal BN (hBN) under high temperature and pressure conditions, wBN can now be stabilized at atmospheric pressure to obtain high-quality samples. Our first-principles study investigates the electronic, vibrational, and optical properties of wBN across a broad range of pressures. We account fo The structure and phase composition of colloidal SPM Fe3O4 NPs remains puzzling despite the availability of increasing amounts of structural information. Various spectroscopic measurements have shown that the structure of SPM Fe3O4 NPs can be described as a magnetite core with a thin overoxidized (Fe3+) surface shell, which is compositionally close to a maghemite polymorph (γ-Fe2O3).9a, Conversely, the putative Fe3O4@γ-Fe2O3 core−shell structure has not been observed by X-ray diffraction or elec The pressure-induced transformation of the rare β-Fe2O3 phase has been studied for the first time, leading to the identification of a new iron(III) oxide polymorph, ζ-Fe2O3. The transformation of β-Fe2O3 into ζ-Fe2O3 occurs above 30 GPa, and the new phase withstands pressures of up to ~70 GPa, which is well above the thresholds for the pressure-induced transformations of α-Fe2O3 or γ-Fe2O3. More strikingly, ζ-Fe2O3 remains stable after pressure release and at room temperature. This remarkable ob No iron(III) oxide phase with a monoclinic crystal structure stable at atmospheric pressure and room temperature has ever been identified. Thus, ζ-Fe2O3 can be regarded as a new iron(III) oxide polymorphic family member. It is known that the stability of nanoscale Fe2O3 polymorphs is governed by two factors: the Gibbs free energy of the different i-Fe2O3 phases (i = α, β, γ, ε) and the energy barrier associated with the phase transformation. These two parameters, in turn, depend on many factors, Spark Plasma Sintering and Hot Isostatic Pressing were used to synthesize coarse-grained and fine-grained Ti3AlC2 specimens. Moreover, Spark Plasma Sintering processing parameters were modified to vary the TiC, Al2O3, and TixAly impurity and porosity in the fine-grained samples. The influence of the Ti3AlC2 microstructure on the oxidation resistance was assessed. It is demonstrated that the grain size can drastically modify the oxidation resistance. The higher density of grain boundaries in fine We synthesized the Ti3AlC2 MAX phase by a ceramic synthesis route and confirmed its structure by X-ray diffraction (see the Supporting Information for full experimental details). It consists of a c-axis stacking sequence where two layers of edge-sharing CTi6 octahedra are sandwiched between planar layers of Al. The butane ODH study with Ti3AlC2 was carried out at different temperatures, varying the O2:butane ratio from 0.25:1 up to 1:1. The product mixture contained 1-butene, 2-butene, butadiene Ti3AlC2, the first MAX phase to be used in heterogeneous catalysis, efficiently catalyzes the oxidative dehydrogenation (ODH) of n-butane to butenes and butadiene, owing to its defective structure and non-stoichiometric oxide layer on the surface. Dehydrogenation or oxidative dehydrogenation (ODH) of alkanes to produce alkenes directly from natural gas/shale gas is gaining importance. Ti3AlC2, a MAX phase that had not been used in catalysis, efficiently catalyzes the ODH of n-butane to butenes a What is Ti3AlC2?Ti₃AlC₂ is MAX Phase-like structured and crystallizes in the hexagonal P6₃/mmc space group. There are two inequivalent Ti sites. Ti is bonded in a 3-coordinate geometry in the first Ti site to three equivalent Al and three equivalent C atoms. All Ti–Al bond lengths are 2.89 Å. Titanium carbide is used to prepare cermets, frequently used to machine steel materials at high cutting speeds. Ti 3 AlC 2 has the Ti 3 SiC 2 structure with lattice parameters of a=0.3075 nm and c=1.858 nm.

High conductivity ultrafine zirconium boride nanoparticles were prepared by solid phase synthesis at low temperature

What is Zirconium boride? Zirconium boride is a common material in borides, and there are three kinds of zirconium boride in the boron-zirconium system, respectively, zirconium boride, zirconium diboride (ZrB2), and zirconium twelve boride

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The crystal phase and manufacturing method of cobalt hydroxide

It is a rose-red monoclinic or hexagonal crystal. It is insoluble in water, slightly amphiphilic, hardly soluble in strong alkalis, but soluble in acids and ammonium salt solutions.

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TiB2 does not occur naturally on Earth. Titanium diboride powders are produced by various high-temperature methods, such as direct reaction of titanium or its oxides/hydrides with elemental boron above 1000°C, carbothermal reduction by the thermite reaction of titanium oxide with boron oxide, or hydrogen. We can manufacture. Reduction of boron halides in the presence of metals or their halides. Electrochemical synthesis and solid-state reactions have been developed among various synthetic routes

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CuO nanowire arrays

Apart from improving the field emission efficiency by optimizing the aspect ratio (length/diameter) of 1D nanostructures, other methods were also used to enhance the field emission current. Wang and Li found that laser irradiation could effectively improve the field emission current of CuO nanowire arrays. The effects of laser intensity, wavelength, emission current, and working vacuum on the enhancement have been investigated in detail. Among these factors, the contribution from extra excited e

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Spherical aluminum oxide nanoparticle synthesis and monolayer film assembly

What is Spherical aluminum oxide?Spherical aluminum oxide powder refers to the aluminum oxide powder material made of specific irregular corner particles by the process of the flame method. A small surface area and good liquidity feature it. Alpha Al2O3 spherical shape powder can be evenly dispersed in the organic body, and the formation of the most closely stacked gets a high filling, low viscosity, and high thermal conductivity mixture. At the same time, alpha Al2O3 spherical shape powder can

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