Estudo do campo cristalino em óxidos contendo íons európio

• Ano de defesa: 2013
• Autor(a) principal: Santana, Pedro Jonathan Santos
• Orientador(a): Santos, Marcos Antonio Couto dos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Física
• Palavras-chave em Português: Eletrostática; Óxidos; Ions; Európio; Teoria do campo cristalino; Óxidos dopados com európio; Parâmetros de campo cristalino; Modelo de recobrimento simples; Método dos vizinhos equivalentes
• Palavras-chave em Inglês: Crystal field theory; Electrostatics; Europium; Ions; Oxides; Europium doped oxides; Crystal field parameters; Simple overlap model; Method of equivalents nearest neighbors
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://ri.ufs.br/handle/riufs/5371

In this work the Point Charge Electrostatic Model (PCEM), the Simple Overlap Model (SOM) and the Method of Equivalents Nearest Neighbors (MENN) were applied to a well known series of oxides, namely, Gd2O3, Y2O3, Lu2O3, In2O3 and Sc2O3, all doped ion Eu3+ with the purpose of discussing the charge of interaction and some aspects of the crystal field effect. To this end, calculations were made of the crystal field and crystal field strength parameters and splitting of the 7F1 level of the luminescent ion. By using the luminescent site local structure, the PCEM, as expected, led to satisfactory results only from the qualitative point of view. With the SOM and the MENN it was possible to reproduce the experimental splitting of the 7F1 energy level and its sublevels, with physically acceptable charge factors. Only in some cases the NN charge has been greater than its valence. A discussion on the position of the charge of interaction also has been made.