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- W1502252979 abstract "The technical progress reported is divided into seven task areas. They are as follows: (1) thermal disproportionation of Si/sub x/F/sub y/ homologues on Si packed beds. Effort has been directed toward the study of the thermal disproportionation of Si/sub x/F/sub y/ homologues on Si packed beds at 850/sup 0/C and 500/sup 0/C. (2) review of experimental results on the near-continuous reactor. The silicon transport data from forty runs conducted on the near-continuous reactor are summarized and discussed. (3) thermal analysis of (SiF/sub 2/)/sub x/ polymer. At 276 to 286/sup 0/C a strong exothermic transition occurs in the (SiF/sub 2/)/sub x/ polymer. The enthalpy (..delta..H) measured by D.S.C. was -44.37 cal/gm. Other smaller endotherms were observed at 96/sup 0/C and 363/sup 0/C. (4) motorola purification therodynamics. In the Appendix can be found thermodynamic calculations for the predicted SiF/sub 4/ to SiF/sub 2/ conversion efficiencies for Step I in the SiF/sub 4/ transport purification process. (5) polymer condensation. It was concluded from the polymer condensation experiments at 0/sup 0/C that substrates and higher pressures in the polymer condensation unit increase condensation efficiency. However, the higher pressure occurring in these experiments markedly reduced the Step I reaction efficiency. (6) crystal growth. Single crystal silicon grown from silicon powder from the near-continuous reactor was shown to be 0.95 ohm cm ''p'' type at the seed end and 2 to 7 ohm cm ''N'' type at the tang. (7) process plant costing. Revised process plant costing estimates for a 1000 metric ton/year plant projects a $7.71/kg total product cost. This is based on a fixed capital investment of $9.1 MM in January 1975 dollars." @default.
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- W1502252979 date "1978-07-25" @default.
- W1502252979 modified "2023-10-14" @default.
- W1502252979 title "Semiconductor grade, solar silicon purification project. Technical quarterly report No. 10, April 1--June 30, 1978" @default.
- W1502252979 doi "https://doi.org/10.2172/6151369" @default.
- W1502252979 hasPublicationYear "1978" @default.
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