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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.

Vapor silica effectively facilitates the flow

What is vaporous silica?Vapour silica is one of the most essential high-tech ultrafine inorganic new materials, with porous, non-toxic, tasteless and pollution-free, the average primary particle size of about 7-40 nano, specific surface area of 50 ~ 380m2/g, high product purity, SiO2 content is not less than 99.8%, is a kind of multi-functional additives. Vapour silica is a kind of ultrafine powder material obtained by hydrolysis and condensation of halosilane in hydrogen and oxygen flame at hig

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Amorphous silicon dioxide product Vapor phase silicon dioxide

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Tantalum Carbide ceramic is a ceramic that contains a seven-crystal phase of Tantalum Carbide

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There are many preparation methods for MAX phase materials. According to different final morphologies, there are different synthesis processes. The morphologies of MAX phase materials are generally massive, powdery and thin film.

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How useful is the new MAX phase ceramics?

What is the MAX phase?MAX phase (including Ti3SiC2, Ti2AlC, etc.) is a new machinable ceramic material that has attracted much attention. This material includes more than fifty kinds of ternary carbides or nitrides. M represents a transition metal eleme

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Newly 3000°C Ablative Ceramic Coating Successfully Developed - Multi-boron-containing Single-phase Carbide

Boron carbide, alias black diamond, has a molecular formula of B4C, usually grayish black powder.

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What is Max phase material?

The China Securities New Energy Vehicle index rose as much as 4.1 percent after a strong rally in lithium-ion shares on the Chinese stock market. Brokerages said lithium enterprises would usher in marginal expectations, and currently, it may be the b

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What is MAX Phase Material

The MAX phase material is a natural layered carbonitride inorganic non-metallic material composed of three elements. It has the electrical and thermal conductivity of metal, and also has the high strength, high temperature resistance.

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Liquid phase exfoliated molybdenum telluride (MoTe2) nanosheets can be used as high-efficiency materials

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Italy further strengthens prevention and control measures, Trunnano titanium silicon carbide exports blocked

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The U.S. develops soft biosensor patch that can comprehensively monitor vital signs of children-a significant advancement in Ti3AlC2 Ceramic Material

A team of American scientists has developed a software biosensor patch that can be attached to the skin of critically ill infants or children to monitor vital signs and other information comprehensively. Such as heart fibrillation, movement,

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