PROCESSING AND CHARACTERIZATION OF MIXED NIOBIUM-TANTALUM OXIDE OBTAINED FROM TANTALITE ORE

Andreia de Morais; Sara Luiza Gusso; Yosthyn Manuel Ariza Florez; Cleonilson Mafra Barbosa; Gregório Faria; Jilian Nei de Freitas

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Trabalho

Título do Trabalho

PROCESSING AND CHARACTERIZATION OF MIXED NIOBIUM-TANTALUM OXIDE OBTAINED FROM TANTALITE ORE

Autores

Andreia de Morais
Sara Luiza Gusso
Yosthyn Manuel Ariza Florez
Cleonilson Mafra Barbosa
Gregório Faria
Jilian Nei de Freitas

Modalidade

Pôster - resumo

Área temática

Dispositivos eletrônicos, eletroquímicos, supercapacitores e baterias

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1455311-processing-and-characterization-of-mixed-niobium-tantalum-oxide-obtained-from-tantalite-ore

ISBN

978-65-272-2467-9

Palavras-Chave

Mixed niobium-tantalum oxide; sustainable materials; mineral processing; electrical characterization

Resumo

The beneficiation of mineral resources is an important step to ensure chemical purity, added value, and sustainability in the development of advanced functional materials [1]. In this work, mixed niobium-tantalum oxide (Nb2O5:Ta2O5) was obtained from beneficiated tantalum ore extracted from natural deposits located in Parelhas, Brazil [2]. A paste of the material was formulated and deposited onto fluorine-doped tin oxide (FTO) substrates by spin coating. The deposited films were subsequently subjected to thermal treatment at 500 °C for 2 h to promote crystallization and remove organic residues. Structural characterization by X-ray diffraction confirmed the presence of crystalline phases corresponding to niobium oxide and tantalum oxide. Morphological analysis by scanning electron microscopy revealed particles with irregular morphology and a relatively broad size distribution, with an average particle size of approximately 190 nm. The chemical composition of the mixed oxide was quantified by inductively coupled plasma mass spectrometry (ICP-MS), which indicated a Nb:Ta molar ratio of 1.92:1.0 and and an approximate mass ratio of 1:1. Electrical properties were investigated through a combination of current density–voltage (J–V) curves, electrochemical impedance spectroscopy (EIS), and charge extraction by linearly increasing voltage (CELIV) measurements. These techniques enabled the evaluation of charge transport, interfacial resistance, and effective charge carrier mobility within the Nb2O5:Ta2O5 films. Overall, the results demonstrate the potential of beneficiated tantalite as a sustainable source for Nb2O5:Ta2O5 films. while highlighting the need for further optimization to improve film uniformity and electrical performance for advanced applications. While further optimization is required to improve film uniformity and electrical performance, the proposed approach represents a promising pathway for integrating mineral beneficiation with the development of advanced oxide materials for electronic applications. We acknowledge support from FAPESP (processo n° 2017/11986-5), Shell, FINEP (processo: 0139/21), and INEO (FAPESP - processo nº 2025/27044-5 e CNPq - processo: 408449/2024-1). [1] Nzeh, N. S. et al. Materials Today: Proceedings, 2022, 65, 3, 2184-219. [2] Araújo Pacelly, C. P. B. et al. Minerals Engineering, 2021, 170, 107073.

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

MORAIS, Andreia de et al.. PROCESSING AND CHARACTERIZATION OF MIXED NIOBIUM-TANTALUM OXIDE OBTAINED FROM TANTALITE ORE.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1455311-PROCESSING-AND-CHARACTERIZATION-OF-MIXED-NIOBIUM-TANTALUM-OXIDE-OBTAINED-FROM-TANTALITE-ORE. Acesso em: 26/07/2026