my-server
← Wiki

Niobate

A niobate is an oxo-acid salt formed by niobium (Nb), and the common forms are metaniobate (NbO<sub>3</sub><sup>−</sup>) and orthoniobate (NbO<sub>4</sub><sup>3−</sup>). The most common niobates are lithium niobate (LiNbO<sub>3</sub>) and potassium niobate (KNbO<sub>3</sub>).

Preparation

The niobate can be obtained by reacting niobium pentoxide with the corresponding oxide, hydroxide or carbonate. For example, reacting lithium carbonate with niobium pentoxide would obtain lithium niobate:

Li<sub>2</sub>CO<sub>3</sub> + Nb<sub>2</sub>O<sub>5</sub> → 2 LiNbO<sub>3</sub> + CO<sub>2</sub>↑

Cobalt metaniobate can be obtained by heating a mixture of cobalt monoxide and niobium pentoxide:

CoO + Nb<sub>2</sub>O<sub>5</sub> → Co(NbO<sub>3</sub>)<sub>2</sub>

Lanthanide oxides react with niobium pentoxide to form the lanthanide orthoniobates:

Ln<sub>2</sub>O<sub>3</sub> + Nb<sub>2</sub>O<sub>5</sub> → 2 LnNbO<sub>4</sub>

References