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● H e l p ● L e a r n t o e d i t ● C o m m u n i t y p o r t a l ● R e c e n t c h a n g e s ● U p l o a d f i l e
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P a g e s f o r l o g g e d o u t e d i t o r s l e a r n m o r e ● C o n t r i b u t i o n s ● T a l k
( T o p )
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● W i k i m e d i a C o m m o n s
A p p e a r a n c e
F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
T h i s i s a n o l d r e v i s i o n o f t h i s p a g e , a s e d i t e d b y V 1 a d i s 1 a v ( t a l k | c o n t r i b s ) at 2 1 : 3 1 , 1 5 J u l y 2 0 2 3 . T h e p r e s e n t a d d r e s s ( U R L ) i s a p e r m a n e n t l i n k t o t h i s r e v i s i o n , w h i c h m a y d i f f e r s i g n i f i c a n t l y f r o m t h e c u r r e n t r e v i s i o n . ( d i f f ) ← P r e v i o u s r e v i s i o n | L a t e s t r e v i s i o n ( d i f f ) | N e w e r r e v i s i o n → ( d i f f )
Silicon tetrafluoride or tetrafluorosilane is a chemical compound with the formula Si F 4 Carl Wilhelm Scheele by dissolving silica in hydrofluoric acid ., later synthesized by John Davy in 1812.[5] [6]
Preparation
SiF4 is a by-product of the production of phosphate fertilizers wet process production , resulting from the attack of HF fluorapatite protonolysis) on silicates , which are present as impurities in the phosphate rocks .[7] hydrofluoric acid and silicon dioxide (SiO2 hexafluorosilicic acid :[7]
6 HF + SiO2 2 6 2 O
In the laboratory, the compound is prepared by heating barium hexafluorosilicate (Ba[SiF6 SiF4 , leaving a residue of BaF2
Ba[SiF6 BaF2 + SiF4
Alternatively, sodium hexafluorosilicate (Na 2 6 [8] : 8
Na 2 6 NaF + SiF4
Uses
This volatile compound finds limited use in microelectronics and organic synthesis .[9]
It's also used in production of fluorosilicic acid (see above).[6]
Staying in the 1980s, as part of the Low-Cost Solar Array Project by Jet Propulsion Laboratory ,[10] polycrystalline silicon production in fluidized bed reactors .[11] [8] [12]
The Ethyl Corporation process
In 80s the Ethyl Corporation came up with a process that uses hexafluorosilicic acid and sodium aluminium hydride (NaAlH4 alkali metal hydride) to produce silane (SiH4 [13]
Occurrence
Volcanic plumes contain significant amounts of silicon tetrafluoride. Production can reach several tonnes per day.[14] [15] hexafluorosilicic acid .
Safety
In 2001 it was listed by New Jersey authorities as a hazardous substance that is corrosive and may severely irritate or even burn skin and eyes.[6] [2]
See also
References
^ "Fluorides (as F)" . Immediately Dangerous to Life or Health Concentrations (IDLH) . National Institute for Occupational Safety and Health (NIOSH).
^ John Davy (1812). "An Account of Some Experiments on Different Combinations of Fluoric Acid" . Philosophical Transactions of the Royal Society of London 102 : 352–369. doi :10.1098/rstl.1812.0020 ISSN 0261-0523 . JSTOR 107324 .
^ a b c "Hazardous Substance Fact Sheet" (PDF) . New Jersey Department of Health and Senior services. November 2001.
^ a b Hoffman, C. J.; Gutowsky, H. S. (1953). Silicon Tetrafluoride . Inorganic Syntheses. Vol. 4. pp. 147–8. doi :10.1002/9780470132357.ch48 .
^ a b Us Granted A345458 , Keith, C. Hansen & L. Yaws, Carl, "Patent Silicon tetrafluoride generation", published January 3, 1982, issued 1982
^ Shimizu, M. "Silicon(IV ) Fluoride" Encyclopedia of Reagents for Organic Synthesis, 2001 John Wiley & Sons. doi :10.1002/047084289X.rs011
^ Callaghan, William T. (1981). Palz, W. (ed.). "Low-Cost Solar Array Project Progress and Plans" . Photovoltaic Solar Energy Conference . Dordrecht: Springer Netherlands: 279–286. doi :10.1007/978-94-009-8423-3_40 . ISBN 978-94-009-8423-3
^ Acharya, H. N.; Datta, S. K.; Banerjee, H. D.; Basu, S. (1982-09-01). "Low-temperature preparation of polycrystalline silicon from silicon tetrachloride" . Materials Letters . 1 2 ): 64–66. doi :10.1016/0167-577X(82 )90008-8 . ISSN 0167-577X .
^ CA 2741023A1 , Anatoli, V. Pushko & Tozzoli, Silvio, "Method for the production of polycrystalline silicon", issued 2008
^ "The Ethyl Corporation Process: Silane and Fluidised Bed Reactor" . August 11, 2015.
^ T. Mori; M. Sato; Y. Shimoike; K. Notsu (2002). "High SiF4/HF ratio detected in Satsuma-Iwojima volcano's plume by remote FT-IR observation" (PDF) . Earth Planets Space . 54 3 ): 249–256. Bibcode :2002EP&S...54..249M . doi :10.1186/BF03353024 S2CID 55173591 .
^ Kruszewski, Ł., Fabiańska, M.J., Ciesielczuk, J., Segit, T., Orłowski, R., Motyliński, R., Moszumańska, I., Kusy, D. 2018 – First multi-tool exploration of a gas-condensate-pyrolysate system from the environment of burning coal mine heaps: An in situ FTIR and laboratory GC and PXRD study based on Upper Silesian materials. Science of the Total Environment, 640-641, 1044-1071; DOI: 10.1016/j.scitotenv.2018.05.319
t
e
Si(II )
Si(III)
Si(IV )
t
e
PF 6 − , AsF6 − , SbF6 − compounds
AlF6 − compounds
chlorides, bromides, iodides
SiF6 2- , GeF6 2- compounds
Oxyfluorides
Organofluorides
with transition metal,
nitric acids
bifluorides
thionyl, phosphoryl,
Chemical formulas
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Silicon_tetrafluoride&oldid=1165545840 " C a t e g o r i e s : ● F l u o r i d e s ● N o n m e t a l h a l i d e s ● I n o r g a n i c s i l i c o n c o m p o u n d s ● S i l a n e s H i d d e n c a t e g o r i e s : ● A r t i c l e s w i t h o u t I n C h I s o u r c e ● C h e m i c a l p a g e s w i t h o u t C h e m S p i d e r I D ● A r t i c l e s w i t h o u t E B I s o u r c e ● A r t i c l e s w i t h o u t K E G G s o u r c e ● E C H A I n f o C a r d I D f r o m W i k i d a t a ● A r t i c l e s c o n t a i n i n g u n v e r i f i e d c h e m i c a l i n f o b o x e s ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n m a t c h e s W i k i d a t a ● A r t i c l e s w i t h G N D i d e n t i f i e r s
● T h i s p a g e w a s l a s t e d i t e d o n 1 5 J u l y 2 0 2 3 , a t 2 1 : 3 1 ( U T C ) . ● T h i s v e r s i o n o f t h e p a g e h a s b e e n r e v i s e d . B e s i d e s n o r m a l e d i t i n g , t h e r e a s o n f o r r e v i s i o n m a y h a v e b e e n t h a t t h i s v e r s i o n c o n t a i n s f a c t u a l i n a c c u r a c i e s , v a n d a l i s m , o r m a t e r i a l n o t c o m p a t i b l e w i t h t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
