Cov qauv ntawm Hexagonal Boron Nitride

Boron nitride (BN) yog ib qho tshiab dav-band sib txawv nanomaterial nrog cov khoom zoo thiab muaj peev xwm loj hlob zoo. Nws yog ib qho kev sib xyaw ua ke ntawm pawg ⅲ - ⅴ, muaj li ntawm nitrogen atoms thiab boron atoms. Nitrogen atoms thiab boron atoms sib xyaw ua ke hauv ntau txoj kev sib txawv los tsim boron nitride nrog cov qauv sib txawv: hexagonal boron nitride (H-BN), rhomboidal boron nitride (R-BN), cubic boron nitride (C-BN), wurtzite boron nitride (W-BN), thiab orthogonal boron nitride (O-BN). Ntawm lawv, hexagonal boron nitride yog tib theem boron nitride uas muaj nyob rau hauv qhov xwm txheej.

Hexagonal boron nitride belongs to hexagonal crystal system, with the same hexagonal crystal structure as graphene. Its lattice constant A =0.2504nm, C =0.6661nm, is stacked by multi-layer structure. B-n-b between layers is connected by van der Waals force, easy to be peeled off, light in mass, non-conductive, with a wide band gap (5.1eV). It has the advantages of high hardness (Mohr hardness 2), high melting point (>3000K), siab oxygen tsis kam ntawm 900 degree, kub tsis kam ntawm 2000 degree, qis thermal expansion / shrinkage tus nqi, zoo cua sov dissipation raws C-axis, thiab muaj ntau yam kev siv. Ntxiv mus, ib los yog ntau txheej hexagonal BORON nitrous raj nanomaterials tuaj yeem raug crimped rau hauv hexagonal boron nitrous raj.