Does anyone know if silicide would react with dilute HF acid? Intermetallic silicides like NiSi,CoSi,FeSi,PtSi etc.. If some silicides react with HF acid, what are the product of these reactions? It will be really helpful if anyone could answer this question and it would be better to recommend some articles.
The reaction of Mo- and U-silicides with HF was exploited almost 60 years ago for analytical purposes (https://hrcak.srce.hr/file/305894). The treatment most probably results in stable U/Mo silicafluorides, that are subsequently converted in the relevant oxides.
In general, fluorides are likely to be formed when treating silicides containing hard cations (in terms of HSAB theory), i.e. short-radius metal ions in a high oxidation states, such as Fe(III) or Co(III).
Hello Haoyue,
this is a very interestig technical question. Transition metal silicides are normally high resistant toward a variety of chemicals. however, dilute HF can be used for etching the surface of such silicides. Attached plased find cited below and attached two typical articles dealing with the etching of cobalt and platinum silicide. In the first article it is outlined that metal hexafluorosilicates (in this case CoSiF6) are the final products of these reactions:
Kinetics and Mechanism of the Etching of CoSi2 in HF-based Solutions
Article Kinetics and Mechanism of the Etching of CoSi[sub 2] in HF-b...
P.S. When working with (even dilute) HF please always keep in mind the very high toxicity of this acid. Always wear protective gloves!
Good luck with your work and best wishes, Frank Edelmann
This book might be helpful
https://www.sciencedirect.com/book/9780750633659/chemistry-of-the-elements
Sourav Roy Thank you~ I will read this book to see if there is something that could work.
Frank T. Edelmann Thank you for the articles you recommend~ It is very useful for me to learn more about the silicide reacting with HF. And thanks for reminding me to be cautious about the utilize of HF.
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