0 s , ▁it ▁was ▁mostly ▁replaced ▁by ▁ion ▁impl ant ation , ▁which ▁re lies ▁mostly ▁on ▁B F 3 ▁as ▁a ▁bor on ▁source . ▁Bor on ▁tr ich lor ide ▁gas ▁is ▁also ▁an ▁important ▁chemical ▁in ▁sem icon duct or ▁industry , ▁however ▁not ▁for ▁do ping ▁but ▁rather ▁for ▁pl asma ▁et ch ing ▁of ▁met als ▁and ▁their ▁ox ides . ▁Tri eth yl bor ane ▁is ▁also ▁inject ed ▁into ▁v apor ▁de position ▁react ors ▁as ▁a ▁bor on ▁source . ▁Ex amples ▁are ▁the ▁pl asma ▁de position ▁of ▁bor on - cont aining ▁hard ▁carbon ▁films , ▁sil icon ▁nit ride - bor on ▁nit ride ▁films , ▁and ▁for ▁do ping ▁of ▁diam ond ▁film ▁with ▁bor on . ▁ ▁Mag net s ▁Bor on ▁is ▁a ▁component ▁of ▁ne od ym ium ▁magnet s ▁( N d 2 Fe 1 4 B ), ▁which ▁are ▁among ▁the ▁strong est ▁type ▁of ▁permanent ▁magnet . ▁These ▁magnet s ▁are ▁found ▁in ▁a ▁variety ▁of ▁elect rome chan ical ▁and ▁electronic ▁devices , ▁such ▁as ▁magnetic ▁reson ance ▁imag ing ▁( M RI ) ▁medical ▁imag ing ▁systems , ▁in ▁compact ▁and ▁relatively ▁small ▁mot ors ▁and ▁actu ators . ▁As ▁examples , ▁computer ▁H DD s ▁( hard ▁disk ▁drives ), ▁CD ▁( comp act ▁disk ) ▁and ▁DVD ▁( dig ital ▁vers atile ▁disk ) ▁players ▁rely ▁on ▁ne od ym ium ▁magnet ▁mot ors ▁to ▁deliver ▁inten se ▁rot ary