Kev sib piv ntawm Hexagonal Boron Nitride Thiab Graphite Structures
Aug 17, 2023
Boron nitride, tseem hu ua BN, yog cov khoom siv nrog ntau yam khoom uas tau kawm dav hauv ob peb lub xyoo dhau los. Muaj ob hom qauv ntawm boron nitride: hexagonal boron nitride (h-BN) thiab cubic boron nitride (c-BN). Ntawm lawv, h-BN muaj cov qauv zoo sib xws rau graphite, uas muab cov khoom sib piv. Yog li ntawd, kev sib piv ob lub qauv tuaj yeem ua rau kom nkag siab tob txog cov khoom ntawm txhua yam khoom.
Ua ntej, cia peb xav txog cov qauv ntawm h-BN. Nws yog tsim los ntawm cov txheej ntawm hexagonally teem boron thiab nitrogen atoms, qhov twg txhua boron atom yog bonded rau peb nitrogen atoms thiab vice versa. Cov khaubncaws sab nraud povtseg no tau tuav ua ke los ntawm cov tsis muaj zog van der Waals uas tso cai rau lawv plam thiab swb ib leeg, zoo ib yam li cov qauv ntawm graphite. Hauv kev sib piv, cov qauv ntawm graphite muaj cov txheej txheem ntawm hexagonally teem carbon atoms uas tau tuav ua ke los ntawm tsis muaj zog van der Waals rog.
Ib qho ntawm qhov sib txawv tseem ceeb ntawm h-BN thiab graphite yog qhov muaj nitrogen atoms hauv h-BN. Qhov no txhim kho nws cov tshuaj lom neeg ruaj khov, ua rau nws tiv taus oxidation, corrosion, thiab tshuaj tua kab mob. Tsis tas li ntawd, h-BN muaj ntau dua thermal conductivity thiab hluav taws xob tiv taus tshaj graphite, ua rau nws zoo heev hluav taws xob thiab thermal insulator.
Txawm li cas los xij, graphite muaj lub zog zoo tshaj plaws thiab muaj zog tiv taus rau sab nraud ntau dua li h-BN vim muaj zog covalent bonds ntawm carbon atoms piv rau ionic bonds ntawm boron thiab nitrogen atoms hauv h-BN. Cov qauv tshwj xeeb ntawm graphite kuj tso cai rau nws kom muaj lubricity siab, ua rau nws muaj txiaj ntsig zoo rau cov ntawv thov xws li xaum txhuas thiab ua cov roj nplua nyeem hauv tshuab.
Hauv cov ntsiab lus, thaum h-BN thiab graphite muaj cov qauv hexagonal zoo sib xws, lawv muaj cov khoom sib txawv vim muaj cov nitrogen atoms hauv h-BN thiab qhov sib txawv ntawm covalent thiab ionic bonding ntawm cov ntaub ntawv. Ob qho khoom siv muaj qhov tshwj xeeb thiab muaj txiaj ntsig zoo rau ntau yam kev siv, thiab kev kawm txog qhov sib txawv ntawm ob qho tib si tuaj yeem ua rau kev tsim kho tshiab siv rau cov ntaub ntawv no.