Assertion: pure semiconductor silicon | /r/AtLocation | two forms
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Source sentences:
text: Pure semiconductor silicon is produced in two forms: poly-crystalline (by the reduction of SiCI 4 or SiHCI 3 with zinc or hydrogen or by the thermal decomposition of SiI 4 and SiH 4 ) and single crystals (by floating zone refining and by “withdrawing” a single crystal from molten silicon—the Czohralski method).