Niobate
Group of chemical compounds
From Wikipedia, the free encyclopedia
A niobate is an oxo-acid salt formed by niobium (Nb), and the common forms are metaniobate (NbO3−) and orthoniobate (NbO43−). The most common niobates are lithium niobate (LiNbO3) and potassium niobate (KNbO3).
Preparation
The niobate can be obtained by reacting niobium pentoxide with the corresponding oxide, hydroxide or carbonate.[1] For example, reacting lithium carbonate with niobium pentoxide would obtain lithium niobate:[2]
- Li2CO3 + Nb2O5 → 2 LiNbO3 + CO2↑
Cobalt metaniobate can be obtained by heating a mixture of cobalt monoxide and niobium pentoxide:[3]
- CoO + Nb2O5 → Co(NbO3)2
Lanthanide oxides react with niobium pentoxide to form the lanthanide orthoniobates:[4]
- Ln2O3 + Nb2O5 → 2 LnNbO4