Cov qauv silicon carbide

Peb hom tseem ceeb ntawm silicon carbide polymorph

Muaj li ntawm 250 hom crystalline silicon carbide. Vim tias silicon carbide muaj ntau homogeneous polytypes nrog cov qauv siv lead ua zoo sib xws, silicon carbide muaj cov yam ntxwv ntawm homogeneous polycrystalline.

Silicon carbide (Mosanite) tsis tshua muaj nyob hauv ntiaj teb, tab sis nws yog qhov tshwm sim ntau heev hauv qhov chaw. Cosmic silicon carbide feem ntau yog ib feem ntawm cov hmoov av cosmic nyob ib puag ncig cov hnub qub carbon. Silicon carbide pom nyob rau hauv qhov chaw thiab meteorites yuav luag tsis hloov pauv β-theem crystalline.

A-sic yog qhov feem ntau ntawm cov polytypes no. Nws yog tsim los ntawm qhov kub siab dua 1700 ° C thiab muaj cov qauv siv lead ua hexagonal zoo ib yam li wurtzite.

B-sic, uas muaj cov qauv siv lead ua zoo li pob zeb diamond sphalerite, yog tsim los ntawm tsawg dua 1700 ° C.