Ceramic crucibles: a new alternative for melting of PbO–BiO1.5–GaO1.5 glasses

• Autor(a) principal: Santos, Ieda Maria Garcia dos
• Data de Publicação: 2002
• Outros Autores: Moreira, Rafael Carlos Martins, Souza, Antônio Gouveia de, Lebullenger, Ronan, Hernandes, Antônio Carlos, Leite, Edson Roberto, Paskocimas, Carlos Alberto, Silva, Elson Longo da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/32305
• topic: M140; G180

PbO–Bi2O3–Ga2O3 glasses present interesting properties such as good transmission in the mid-infrared region, high magnetic Verdet constant and non-linear properties. The processing of these heavy-metal-oxide (HMO) glasses is limited by the high corrosive nature of the melt, even in relation to noble metal crucibles. In this work, three kinds of ceramic crucibles (alumina, tin oxide and zirconia) were tested for melting HMO glasses. The main physical properties of the prepared glasses, such as the characteristic temperatures, optical transmission were studied in function of the crucible nature, time/temperature melting parameters. The incorporation of crucible material in the glasses was determined by ICP and atomic absorption. Themaximumglass contamination fromthe crucible was 2.9, 1.6 and 3.6mol% forAl2O3, SnO2 and ZrO2 crucibles, respectively, whenmelting was done at 900 C/240min, for zirconia crucibles and at 1000 C/60 min, for the other two crucibles. The evolution of the physical properties was discussed as a function of contamination degree