Characterization of Nb22O54 microrods grown from niobium oxide powders recovered from mine tailings

In this work, the possibility of using niobium oxide recovered from tailings Penouta Sn-Nb-Ta deposit (located at North Spain) as starting material for growing microstructures is demonstrated. The properties have been studied to understand its crystal structure, quality and purity. Recovered powders are mainly TT-Nb2O5. These used grow Nb22O54 microrods by an evaporation method in argon atmosphere. Different characterization techniques (X-Ray diffraction, scanning electron microscopy, micro-Raman spectroscopy, luminescence) determine microrods, focusing on refractive index. present study opens way transformation waste (mine tailings) into a high technological value oxide, reintroduction chain wide range applications, coatings batteries supercapacitors.