高压物理学报2025，Vol.39Issue(6)：1-8,8.DOI:10.11858/gywlxb.20251020
高压偶联反应合成铂族金属氮化物OsNx
Synthesis of Platinum-Group Metal Nitride OsNx through High-Pressure Coupling Reaction
摘要
Abstract
Platinum-group metals(PGMs)nitrides represent a new class of super incompressible superhard materials,typically synthesized under extreme conditions(above 45 GPa,2000 K)using laser-heated diamond anvil cell(LHDAC)technology via monatomic elemental chemosynthesis(A+B=AB).Exploring non-conventional synthesis methods that significantly reduce the required pressures is crucial for advancing the development and application of PGMs nitrides.In this work,OsNx(0.16≤x≤0.38)was synthesized for the first time via a novel high-pressure coupling(HPC)reaction,using Fe2O3/Co2O3,h-BN,and Os powders as precursors under high-temperature and high-pressure conditions(15 GPa,1800-2100 K)in a large-volume press.The HPC-synthesized metal bulk products primarily consist of OsNx alloyed with iron-based nitrides.Phase composition and structural characterization via X-ray powder diffraction(XRD)and scanning electron microscope(SEM)confirm the formation of hexagonal OsN2(space group P63/mmc),as theoretically predicted,at pressures well below the 50 GPa threshold typically required for high-pressure monatomic elemental combination reactions.The nitrogen atoms partially occupy interstitial sites within the Os crystal structure.This study demonstrates that the HPC reaction effectively lowers the energy barrier for Os nitration,facilitating the formation of non-stoichiometric OsNx compounds.These findings open a new synthetic route for bulk PGM nitride materials under significantly reduced pressure conditions.关键词
高压偶联反应/铂族金属氮化物/氮化锇/大腔体压机/高温高压Key words
high-pressure coupling reaction/platinum-group metals nitrides/osmium nitrides/large-volume press/high-temperature and high-pressure分类
数理科学引用本文复制引用
刘德璞,张恒源,陶雨,贾旭,张瑞柯,贺端威,雷力..高压偶联反应合成铂族金属氮化物OsNx[J].高压物理学报,2025,39(6):1-8,8.基金项目
国家自然科学基金(U2030107) （U2030107）
中央高校基本科研业务费专项资金(2020SCUNL107) （2020SCUNL107）
