Thermoanalytical behavior of neodymium nitrate hexahydrate Nd(NO3)3·6H2O
| Autor: | G. A. Wandekoken, Valdir Aragão do Nascimento, D. Muniz de Albuquerque, Petr Melnikov, L. C. S. de Oliveira, I. V. Arkhangelsky |
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| Rok vydání: | 2019 |
| Předmět: |
Lanthanide
Materials science Inorganic chemistry Condensation Thermal decomposition chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Neodymium 010406 physical chemistry 0104 chemical sciences chemistry.chemical_compound chemistry Nitric acid Azeotrope Water of crystallization Nitrogen dioxide Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 139:3493-3497 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-019-08748-x |
| Popis: | The hexahydrate Nd(NO3)3·6H2O melts in its water of crystallization at 328 K. There are no phase transitions at least above 233 K. Similar to other nitrates in the lanthanide series, its thermal decomposition is a gradual process, which entails the formation of a cluster 6[Nd(NO3)3·6H2O] after the condensation of 6 mol of the initial monomer. During this process, a multicomponent multiphase system exists far from equilibrium and is continuously maintained in this state until normal neodymium oxide is formed. The main volatile products of thermolysis are water, nitric acid, azeotrope 68% HNO3–32% H2O, nitrogen dioxide and oxygen. The proposed mechanism satisfactorily explains the mass losses in accordance with the experimental results. |
| Databáze: | OpenAIRE |
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