A5072351577- Metal and Thin Film Mechanics
- Boron and Carbon Nanomaterials Research
- Crystallization and Solubility Studies
- Inorganic Chemistry and Materials
- MXene and MAX Phase Materials
- X-ray Diffraction in Crystallography
- High-pressure geophysics and materials
- Diamond and Carbon-based Materials Research
Nagoya University
2020-2024
A novel high-pressure molybdenum nitride phase, Mo3N5, was synthesized at above 45 GPa via a nitridation reaction of with nitrogen under high pressure using laser-heated diamond anvil cell. having an N-N dimer and 7-coordinated Mo sites, crystallizes in orthorhombic structure space group Cmcm (No. 63) without other prototype structures. The refined lattice parameters for Mo3N5 were = 2.86201(2) Å, b 7.07401(6) c 14.59687(13) Å. DFT enthalpy calculation suggested that is stable which also...
A novel niobium nitride, U2S3-type Nb2N3, has been successfully synthesized by nitridation of δ-NbN above approximately 30 GPa in a laser-heated diamond anvil cell. Nb2N3 crystallizes the same orthorhombic structure (space group: Pnma) as η-Ta2N3. consists regular-shaped polyhedra, and bulk modulus determined to K0 = 300(2) GPa. The low-temperature X-ray diffraction measurements have conducted for tiny between 297.7(5) 106.3(3) K under ambient pressure. shows no structural phase transition...
A novel high-pressure phase of manganese mononitride, NiAs-type MnN, was successfully synthesized through a pressure-induced transition from tetragonal distorted NaCl-type MnN at pressures above approximately 55 GPa. High-pressure experiments, including starting material preparation, were conducted using laser-heated diamond anvil cell. This result is the first example nitride with structural to structure. Upon decompression after structure, underwent change phase, indicating reversible. has...
A novel transition metal pernitride, CuAl2-type VN2, has been synthesized at a pressure above 73.3 GPa. The bulk modulus determined to be K0 = 347(12) By hard X-ray absorption spectrum measurements of the valence state ions in pernitrides for first time experimentally reported.
Abstract The structural properties of NbON oxynitride under high pressure were investigated through in situ synchrotron X-ray diffraction (SXRD) up to 43 GPa. It was found that the bulk modulus baddeleyite (290 GPa) is larger than ZrO2 (150 GPa), indicating introduction highly covalent nitrogen imparts greater stiffness. Furthermore, SXRD patterns reveal emergence a peak signaling new crystalline phase above around 20 This contrast TaON, where only show an increase background beyond 33...
The recent development of high-pressure experimental techniques combined with advanced characterization and analytical methods allows us to reveal the crystal chemistry transition metal-nitrogen binary compounds up megabar pressure regime. Novel early compounds, VN2, Nb2N3, MoC-type WN0.6, have been synthesized by using a laser-heated diamond-anvil cell or DIA-type apparatus. In addition conventional in-situ X-ray diffraction measurements, low-temperature thermal expansion behavior valance...
Pernitrides and polynitrides synthesized under high pressure, containing nitrogen dimers molecular nitrogen, respectively, are a group of compounds quite different from conventional nitrides ambient pressure. Transition-metal composed transition-metal have been above about 100 GPa, various types discovered. anisotropic axial compressibility in the bonding direction due to low dimers. In this article, we review recent progress nitrogen-containing metal compression behavior novel...