Ammonium niobate(V) oxalate hydrate is primarily utilized in the preparation of niobium-based materials, particularly in the synthesis of niobium oxide (Nb₂O₅). This compound serves as a precursor in the production of high-purity niobium oxides, which are essential in the manufacturing of specialized ceramics, optical glasses, and catalysts. It is also employed in the fabrication of thin films and coatings for electronic and photonic devices, where precise control over niobium content is critical. Additionally, it finds application in research and development for creating advanced materials with tailored properties for use in energy storage, such as lithium-ion batteries, and in the field of superconductors. Its role as a starting material in chemical vapor deposition (CVD) processes further highlights its importance in the development of high-performance materials for industrial and technological applications.