How do you prepare Nb(OH)5 without using HF, and what is the XRD pattern of Nb(OH)5?

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Michael Nazarkovsky

Please, provide any possible synthesis of Nb(OH)5. This compound does not exist in the nature. All the oxide-based substances of Nb(V) have polymeric forms like (Nb2O5)x(H2Oy) and are labelled as niobic acids

Liqiang Liu

Thank you very much. What can I get when put Nb2O5 into HF(80℃),than adding NH3.H2O?

Haha! The description you've given seems strange. HF provokes reduction reactions. Hence, niobia'll change its structure to lower values of valences. Show me the reference where your version is accurately reported :)