| Journal: | Materials research |
| Database: | PERIÓDICA |
| System number: | 000312436 |
| ISSN: | 1516-1439 |
| Authors: | Lobato, A.R1 Lanfredi, S2 Carvalho, J.F Hernandes, A.C |
| Institutions: | 1Universidade de Sao Paulo, Instituto de Fisica de Sao Carlos, Sao Carlos, Sao Paulo. Brasil 2Universidade Federal de Goias, Instituto de Fisica, Goiania, Goias. Brasil |
| Year: | 2000 |
| Season: | Jul |
| Volumen: | 3 |
| Number: | 3 |
| Pages: | 92-96 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | Gallium solubility in the Bi12TiO20 (BTO) matrix was investigated by solid state reaction synthesis and Bi12Ti(1-x)GaxO20 (BTGaO) single crystals were grown by Top Seeded Solution Growth (TSSG). We determined that it is possible to obtain a continuous solid solution from (x)Bi12TiO20: (1-x)Bi12[Ga0.7Bi0.3]O20 and that Ga replaces Ti in the BTO matrix giving Bi12Ti(1-x)Ga(x)O20 up to x < 0.2. BTGaO single crystals grown with an excess of Bi2O3 were transparent, a bleaching effect was observed due to the presence of gallium in the crystalline sillenite structure and their lattice parameter was higher than for pure BTO. The results for BTGaO single crystals showed an increase in the optical activity from r0 = 6.4° ± 0.3°/mm, for BTO, to r0 = 9.7° ± 0.3°/mm, for BTGaO grown with x = 0.30 in the melt. The BTGaO crystal presented an activation energy value of 0.48 ± 0.02 eV for 100 °C £ T £ 300 °C |
| Disciplines: | Ingeniería |
| Keyword: | Ingeniería de materiales, Crecimiento de cristales, Oxido de titanio, Propiedades fisicoquímicas, Estructura cristalina, Sólidos |
| Keyword: | Engineering, Materials engineering, Crystal growth, Titanium oxide, Physicochemical properties, Crystal structure, Solids |
| Full text: | Texto completo (Ver HTML) |
