How is nickel boron applied

Nickel boride is an efficient catalyst and reducing agent. It is used as a heterogeneous hydrogenation catalyst. It can also be used to cleave thioacetals.…

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We synthesized pure polycrystalline cubic boron nitride

We synthesized pure polycrystalline cubic boron nitride (cBN) and wurtzite boron nitride (wBN) by the direct conversion method from hexagonal boron nitride. We measured their longitudinal-wave elastic constants CL between 20 and 300 K using picosecon...…

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Nanoindentation measurements of a highly oriented wurtzite-Type boron nitride bulk crystal

Wurtzite boron nitride is a metastable superhard material that is a high-pressure polymorph of BN. Clarifying how the metastable high pressure material can be stabilized at atmospheric pressure is a challenging issue of fundamental scientific importa...…

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Micro-grains of wurtzite boron nitride(wBN) crystal have been observed

Micro-grains of wurtzite boron nitride(wBN) crystal have been observed in 5.0-7.0 GPa pressure and 1800-2000 K temperature where cubic boron nitride has been synthesized in a catalyst. The wBN grain size is about 20-30 nm. The presence of these micro...…

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Nonreversible Transition from the Hexagonal to Wurtzite Phase of 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 no...…

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Wurtzite Boron Nitride Crystal Growth in the Region of Cubic Boron Nitride Crystal Synthesizing

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 ...…

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Elastic constants of cubic and wurtzite boron nitrides

What is Wurtzite boron nitride?Wurtzite boron nitride is a metastable superhard material that is a high-pressure polymorph of BN. Clarifying how the metastable high pressure material can be stabilized at atmospheric pressure is a challenging issue of...…

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Super Abrasive Wurtzite Boron Nitride

It's a relatively new super abrasive material used in conjunction with detonation. Wurtzite BN is the next step in the evolution of boron nitride, after the well-known cubic BN and another substance called graphite, which has a structure similar to h...…

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What is Wurtzite boron nitride

Wurtzite boron nitride (w-BN) is a metastable high-pressure polymorph of BN, which can only be fabricated as micrometer-size powders by the shock compression of hexagonal BN. Here, we fabricate millimeter-size w-BN bulk crystals and reveal an unprece...…

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Boron carbide is the third hardest material in nature

Boron carbide (B4C) is the third hardest material in nature, but applications are hindered by its brittle failure under impact. We found that this brittle failure of B4C arises from amorphous shear band formation due to the deconstruction of icosahed...…

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Biaxial Shear Deformation of Boron carbide

What is Boron carbide?To improve the flexibility of B4C, we use our model for the origin of brittleness to propose a laminated composite structure of B4C–B6O. We use QM to examine the shear deformation along various possible slip systems to understan...…

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Improved Ductility of Boron Carbide by Microalloying with Boron Suboxide

What is Boron carbide?Boron carbide (B4C) is the third hardest material in nature, but applications are hindered by its brittle failure under impact. We found that this brittle failure of B4C arises from amorphous shear band formation due to the deco...…

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