Thermoanalytical characterization of neodymium peroxicarbonate
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2001
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RARE EARTHS'2001
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This paper presents the data collected for the neodymium peroxicarbonate by thermogravimetry (TG)–differential thermogravimetry (DTG), active oxygen determination via iodine generation and total oxide content by gravimetry and elementary analysis of CHN by microanalyses. By thermal analysis (DTG) a mass loss corresponding to volatile components and water, equivalent to 27.65% of the total mass was observed. This value is in accordance with the mass loss of the compound when it was fired at 900 °C toward the Nd2O3 oxide. With the DTG program a process of thermodecomposition in multisteps, was observed, corresponding to the loss of water (up to 250 °C), evolution of oxygen gas from the peroxide compound and a partial decomposition to CO2 (250 to 600 °C) and a second evolution of CO2 (from 600 to 900 °C). This final evolution of CO2 probably came from the intermediary compound Nd2O2CO3. By microanalyses the carbon and hydrogen contents were 4.8 and 1.0%, respectively. In summary, the analytical data collected allowed one to conclude that the stoichiometric formula for the studied compound is Nd2O2(CO3)2·2H2O.
Como referenciar
QUEIROZ, C.A.S.; MATOS, J.R.; VASCONCELLOS, M.E.; ABRAO, A. Thermoanalytical characterization of neodymium peroxicarbonate. In: RARE EARTHS'2001, Sept. 22-26, 2001, Campos do Jordao, SP. Proceedings... p. 32-35. DOI: 10.1016/S0925-8388(02)00300-6. Disponível em: http://repositorio.ipen.br/handle/123456789/16302. Acesso em: 20 Mar 2026.
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