Glass forming regions, structure and properties of lanthanum barium germanate and gallate glasses

Autor(es)

Calzavara, Florian ^[1] ; Allix, Mathieu ^[2] ; Dussauze, Marc ^[3] ; Jubera, Veronique ^[1] ; Nalin, Marcelo ^[4] ; Cardinal, Thierry ^[1] ; Fargin, Evelyne ^[1]

Afiliação do(s) autor(es)

^[1] Univ Bordeaux, Inst Chim Matiere Condensee Bordeaux, 87 Ave Dr Schweitzer, F-33608 Pessac - France

^[2] Univ Orleans, UPR3079, Condit Extremes & Mat Haute Temp & Irradiat, 1 Ave Rech Sci, F-45100 Orleans - France

^[3] Univ Bordeaux, Inst Sci Mol, Umr 5255, 351 Tours Liberat, F-33405 Talence - France

^[4] Inst Chem Sao Paulo State Univ UNESP, Rua Prof Francisco Degni 55, BR-14800060 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Non-Crystalline Solids; v. 571, NOV 1 2021.
• Citações Web of Science: 0

Resumo

Glass forming regions in the system GaO3/2 - GeO2 - LaO3/2 - BaO have been explored using aerodynamic levitation coupled to laser heating synthesis technique. Structure property relationships have been established between the thermal and optical properties of the resulting glass thanks to Raman and Infrared vibrational spectroscopies. The germano-gallate glass networks are mainly made of three-dimensional interconnected corner shared GeO4 and GaO4 tetrahedra forming Ge - O - Ge and Ga - O- - Ge bridges in which gallium tetrahedral GaO4 units are charged-compensated by barium and lanthanum cations. In GeO2-rich compositions, the excess of positive charges produces mainly non-bridging oxygens on germanate moieties, leading to a depolymerization of the glass network. In the case of gallium rich compositions, the infrared cut-off is red-shifted as compared to the germanate glasses, in accordance with the disappearance of germanium associated entities such as germanium and gallium bridges or germanium sites with non-bridging oxygen both vibrating at higher wavenumber. (AU)

• Processo FAPESP: 19/01223-0 - Estudo das propriedades ópticas e magnéticas de vidros óxidos de metais pesados e suas aplicações em impressão 3D
• Beneficiário: Marcelo Nalin
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• 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