| Journal: | Quimica nova |
| Database: | PERIÓDICA |
| System number: | 000196204 |
| ISSN: | 0100-4042 |
| Authors: | Santos, Arnaud Victor dos1 Simoes, Anderson Savio de Medeiros Souza, Antonio Gouveia de Matos, Jivaldo do Rosario |
| Institutions: | 1Universidade Federal da Paraiba, Departamento de Quimica, Joao Pessoa, Paraiba. Brasil 2Universidade de Sao Paulo, Instituto de Quimica, Sao Paulo. Brasil |
| Year: | 2001 |
| Season: | May-Jun |
| Volumen: | 24 |
| Number: | 3 |
| Pages: | 320-323 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Experimental, descriptivo |
| English abstract | In the last decade, many method has been developed to obtain oxysufides. However, theses materials were obtained by reaction involved gaseous toxics, CO, CS2, H2S and S. In the present work, the synthesis of lanthanum oxysufides actived by europium (III) through an alternative method has been made. This method involve the rare earth sulfate reduction under an atmosphere of argon contained 10% hydrogen using the thermogravimetric technique. The results showed the formation of the phase TR2O2S (TR = La and Eu) at temperatures which depend upon the heating rate, respectively 650 - 830ºC at 5ºC min-1 and 680 - 800ºC at 10ºC min-1. The oxysufides obtained are characterized by infrared spectroscopy. The method developed is more economic than the usual industrial methods and the environmental problems during the synthesis are also better controled |
| Disciplines: | Química |
| Keyword: | Química inorgánica, Tierras raras, Oxisulfuros, Termogravimetría, Gravimetría, Descomposición térmica, Europio, Lantano |
| Keyword: | Chemistry, Inorganic chemistry, Rare earths, Oxysulfides, Thermogravimetry, Gravimetry, Thermal decomposition, Europium, Lanthanum |
| Full text: | Texto completo (Ver HTML) |
