| Texto completo | |
| Autor(es): |
Ferrer, Mateus M.
[1]
;
Sambrano, Julio R.
[2]
;
Hernandes, Antonio C.
[3]
;
Rodrigues, Joao E. F. S.
[3, 4]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Fed Amazonas, Inst Ciencias Exatas, Programa Posgrad Quim, Manaus, Amazonas - Brazil
[2] Sao Paulo State Univ, Modeling & Mol Simulat, Bauru, SP - Brazil
[3] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos - Brazil
[4] CSIC, Inst Ciencia Mat Madrid, Madrid - Spain
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Raman Spectroscopy; v. 51, n. 7 MAY 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
Ba3MgNb2O9 is a double perovskite niobate with a trigonal structure with space group D-3d(3). Such a niobium-based compound has a great potential for applications as microwave dielectrics in the telecommunication industry. In this work, we report the lattice dynamics calculation results using a Short-Range Force Field Model and Density Functional Theory to represent the optical phonon modes at Gamma-point of the Brillouin zone. The classical method uses the nearest neighbor interactions through the interatomic force constants to describe the local order for Raman and infrared spectra. At the same time, density functional theory methods took into account two functionals (PBE and B3LYP) in order to provide the optical modes through second derivatives of the total energy. In both methods, theoretical optical modes are in good agreement with reported experimental data. The combination of both classical and quantum theoretical methods provided basis for a systematic discussion on the origin of the optical modes including the prediction of the dielectric tensor. We believe that this work presents useful information about the structural and vibrational characterization of Ba3MgNb2O9 perovskite and possible targeting for its application as microwave dielectrics for the communication technology. (AU) | |
| Processo FAPESP: | 19/08928-9 - Modelagem e Simulações da Funcionalização de Nanotubos Porosos Inorgânicos |
| Beneficiário: | Julio Ricardo Sambrano |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |