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ThermoRaman spectroscopy has been used to study the mineral segnitite PbFe 3 (AsO 4 ) 2 (OH) 6 , a member of the jarosite mineral group. The hot stage Raman spectroscopic technique identifies the temperatures for the dehydration and dehydroxylation as 200 and 400°C. No changes are observed in the spectra attributed to the arsenate unit until after dehydroxylation. The...
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