Instrument or method to analyze Si and SiO2 powder

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frankythebro
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Hii...

I have a powder that consists of Si, SiO2, Fe3O4, FeO and Fe. I really want to measure the conversion of Si to SiO2. Anybody know what kind of instrument or method that can be used to measure the composition?
 

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I really want to measure the conversion
I thing you mean Yield.

I have an idea it may works but it is not accurate.
If you have evaporation temperature for every component you can insert your sample in Thermo Gravimetric Analyzer which is an instrument that calculate change in weight vs temperature and it can go up to 1500 degree celsius. Now,by knowing evaporation temperature for every component and weight loss during heating process then you can find the weight of every component.