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  • 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. 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 picosecond ultrasound spectroscopy. Their room-temperature values are 945 ± 3 GPa and 930 ± 18 GPa for cBN and wBN, respectively. The shear modulus G of cBN was also determined by combining resonance ultrasound spectroscopy and micromechanics calculation as G 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 importance. Here, we fabricate millimeter-size w-BN bulk crystals via the hexagonal-to-wurtzite phase transformation at high pressure and temperatures. By combining transmission electron microscopy and ab initio molecular dynamics simulations, we reveal a s 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 grains indicates that the pressure for wBN growth could be lower than that found in the previous work. The first, wurtzite boron nitride, is similar to diamond but comprises different atoms. The second, the mineral lonsdaleite, is made from carbon a 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 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 fundamental scientific importance. Here, we fabricate millimeter-size w-BN bulk crystals via the hexagonal-to-wurtzite phase transformation at high pressure and temperatures. By combining transmission electron microscopy and ab initio molecular dyna 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 hexagonal BN. Boron nitride is white graphite due to its similar hexagonal structure and lubricious properties. It is a rigid ceramic material and has a polycrystalline structure that provides superior cutting properties and sharpens itself by cutting 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 unprecedented stabilization mechanism for w-BN. The simulation showed that wurtzite boron nitride would withstand 18 percent more stress than diamond and lonsdaleite 58 percent more. If the results are confirmed with physical experiments, both materials wou 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 icosahedral clusters, and based on this model, we suggest and validate with quantum mechanics (QM, PBE flavor of density functional theory) that a laminated B4C–B6O composite structure will eliminate this brittle failure. Using QM to apply shear deformations

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 picosecond ultrasound spectroscopy. Their room-temperature values are 945 ± 3 GPa and 930 ± 18 GPa for cBN and wBN, respectively. The shear modulus G of cBN was also determined by combining resonance ultrasound spectroscopy and micromechanics calculation as G

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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 importance. Here, we fabricate millimeter-size w-BN bulk crystals via the hexagonal-to-wurtzite phase transformation at high pressure and temperatures. By combining transmission electron microscopy and ab initio molecular dynamics simulations, we reveal a s

More>>

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 grains indicates that the pressure for wBN growth could be lower than that found in the previous work. The first, wurtzite boron nitride, is similar to diamond but comprises different atoms. The second, the mineral lonsdaleite, is made from carbon a

More>>

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 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

More>>

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 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

More>>

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 fundamental scientific importance. Here, we fabricate millimeter-size w-BN bulk crystals via the hexagonal-to-wurtzite phase transformation at high pressure and temperatures. By combining transmission electron microscopy and ab initio molecular dyna

More>>

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 hexagonal BN. Boron nitride is white graphite due to its similar hexagonal structure and lubricious properties. It is a rigid ceramic material and has a polycrystalline structure that provides superior cutting properties and sharpens itself by cutting

More>>

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 unprecedented stabilization mechanism for w-BN. The simulation showed that wurtzite boron nitride would withstand 18 percent more stress than diamond and lonsdaleite 58 percent more. If the results are confirmed with physical experiments, both materials wou

More>>

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 icosahedral clusters, and based on this model, we suggest and validate with quantum mechanics (QM, PBE flavor of density functional theory) that a laminated B4C–B6O composite structure will eliminate this brittle failure. Using QM to apply shear deformations

More>>

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 understand the deformation mechanism for a composite structure. We find that the (001)/[100] slip system requires the smallest maximum shear stress (38.33 GPa), essentially the same as the ideal shear strength (38.97 GPa) of perfect B4C, indicating a similar

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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 deconstruction of icosahedral clusters, and based on this model, we suggest and validate with quantum mechanics (QM, PBE flavor of density functional theory) that a laminated B4C–B6O composite structure will eliminate this brittle failure. Using QM to ap

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