Vim li cas hexagonal Boron nitride thiaj li nplua

Ntau tshaj 100 xyoo dhau los, muaj cov khoom siv uas zoo ib yam li graphite tshwj tsis yog nws cov qauv thiab txawm tias nws cov khoom: hexagonal boron nitride (H-BN). Nws yog ib qho siv lead ua uas muaj 56.4 feem pua ​​​​ nitrogen nucleus thiab 43.6 feem pua ​​​​boron atoms. Nws tseem hu ua "dawb pob zeb ink" vim nws cov xim dawb. Nws cov qauv yog qhia hauv qab no.

H-BN muaj ntau yam zoo heev, tshwj xeeb tshaj yog thiab feem ntau qhuas "slippery". Nws tuaj yeem pom los ntawm daim duab saum toj no uas cov qauv lattice ntawm H-BN zoo ib yam li cov graphite. Boron atoms thiab nitrogen atoms yog staggered los tsim ib tug infinite ciam teb network nrog hexagons li units, uas yog, monolayer H-Bn. Thaum muaj ntau cov khaubncaws sab nraud povtseg ntawm lub network raws C axis nrog ABAB... Uas yog infinitely stacked rau peb-dimensional hexagonal boron nitride.

Nyob rau hauv txhua atomic txheej, boron thiab nitrogen atoms txuas nrog ib tug muaj zog sp² hybrid covalent daim ntawv cog lus nrog ib tug=B =0.2504nm. Txhua ob txheej atomic uas nyob ib sab tuaj yeem txuas nrog lub zog tsis muaj zog sib cuam tshuam -- vanderWaals quab yuam, nrog rau daim ntawv cog lus ntev c=0.6661 LNM. Yog li ntawd, h-BN muaj lub zog me me hauv C-axis kev taw qhia thiab qhov deb loj ntawm cov atoms. Nws yog ib qho yooj yim rau swb ntawm cov khaubncaws sab nraud povtseg thiab muaj lubricity zoo txawm tias kub.