| Texto completo | |
| Autor(es): |
Kindle, Michael
[1]
;
Kmiec, Steven
[2]
;
Silva, Igor d'Anciaes Almeida
[3]
;
Eckert, Hellmut
[3, 4]
;
Martin, Steve W.
[2]
;
Song, Min-Kyu
[1, 5]
;
McCloy, John S.
[1, 5]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Washington State Univ, Mat Sci & Engn Program, Pullman, WA 99164 - USA
[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA - USA
[3] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil
[4] Westfalische Wilhelms Univ Munster, Inst Phys Chem, Munster - Germany
[5] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 - USA
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Non-Crystalline Solids; v. 521, OCT 1 2019. |
| Citações Web of Science: | 0 |
| Resumo | |
This study elucidates the role of Al2O3 in the lithium borovanadate (LBV) system, Li2O-B2O3-V2O5, in improving the glass-forming region of LBV glass. This increased glass-forming tendency is likely due to formation of {[}AlO4](-) units. B-11, Al-27, and V-51 nuclear magnetic resonance measurements suggest an importance of V-O-Al linkages and distribution of Li for charge compensation of {[}AlO4](-) and {[}BO4](-) units. Intense V-51 NMR signals and resolved hyperfine coupling patterns in the electron paramagnetic resonance (EPR) spectra indicate that the majority of vanadium is pentavalent (V5+) and minor amounts of paramagnetic vanadium (V4+) are present. The EPR interaction parameters suggest that the vanadyl-like environments can be described as tetragonally compressed distorted octahedra. Based on V-2p(3/2) X-ray photoelectron spectroscopy, the V4+ concentration is estimated at < 3%. These vanadate glasses are attractive for energy storage applications, as they have higher specific capacities than commercial lithium-ion battery cathodes. (AU) | |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 17/17800-0 - Estudo de correlações estrutura/propriedade em vidros e vitrocerâmicas para armazenamento de energia por técnicas de RMN de estado sólido |
| Beneficiário: | Igor d'Anciães Almeida Silva |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |