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Thermoanalytical behavior of neodymium nitrate hexahydrate Nd(NO3)3·6H2O

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Abstract

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.

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Acknowledgements

This study was financed by Conselho Nacional de Pesquisa (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.

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Authors and Affiliations

  1. Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, Brazil

    P. Melnikov, V. A. Nascimento, L. C. S. de Oliveira, G. A. Wandekoken & D. Muniz de Albuquerque

  2. Moscow State University, Moscow, Russian Federation

    I. V. Arkhangelsky

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  1. P. Melnikov
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  2. I. V. Arkhangelsky
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  3. V. A. Nascimento
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  4. L. C. S. de Oliveira
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  5. G. A. Wandekoken
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  6. D. Muniz de Albuquerque
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Correspondence to P. Melnikov.

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Melnikov, P., Arkhangelsky, I.V., Nascimento, V.A. et al. Thermoanalytical behavior of neodymium nitrate hexahydrate Nd(NO3)3·6H2O. J Therm Anal Calorim 139, 3493–3497 (2020). https://doi.org/10.1007/s10973-019-08748-x

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