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New insights into the thermal behavior and stability of ammonium bifluoride: non-isothermal thermokinetic analysis

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Abstract

In this research, the thermal behavior of NH4HF2 was studied by non-isothermal thermogravimetric analysis between 298 and 600 K in a nitrogen atmosphere. The thermal analysis indicated that the gasification of this material begins in the solid state from 343 K, approximately, and continues after the melting point (398 K) in the liquid state. The Friedman's isoconversional method and combined kinetic analysis were used to evaluate the thermokinetic characteristics of the gasification of this compound in solid and liquid states. The results show that both processes follow an F0 model with \(Ea_{{{\text{Sol}}}}\) = 71.3 kJ mol−1 and \(\ln \left( {A_{{{\text{Sol}}}} /s^{ - 1} } \right)\) = 12.8, and \(Ea_{{{\text{Liq}}}}\) = 66.6 kJ mol−1 and \(\ln \left( {A_{{{\text{Liq}}}} /s^{ - 1} } \right)\) = 11.5. The kinetic triplets were corroborated by reconstructing the original experimental curves and predicting curves obtained under experimental conditions different from those used in the study. The F0 model indicates that the processes are dominated by sublimation/vaporization. The released gases were condensed and characterized, suggesting the formation of a new species, the “NH4HF2 gas.”

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Acknowledgements

The authors thank to Secretaría de Investigación, Internacionales y Posgrado—Universidad Nacional de Cuyo, CONICET and Universidad Nacional del Comahue (PI B202), for partial funding of the present work.

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  1. Laboratorio de Metalurgia Extractiva y Síntesis de Materiales (MESiMat), Instituto Interdisciplinario de Ciencias Básicas (ICB), UNCUYO-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Padre Contreras 1300, CP 5500, Mendoza, Argentina

    Alexander C. Resentera & Mario H. Rodriguez

  2. Centro Atómico Bariloche (CNEA-CONICET), Av. Bustillo Km 9.5, CP 8400, Bariloche, Argentina

    Marcelo R. Esquivel

  3. Universidad Nacional del Comahue (UNCo), Quintral 1250, CP 8400, Bariloche, Argentina

    Marcelo R. Esquivel

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ACR: Conceptualization, Methodology, Validation, Formal analysis, Investigation, Software, Writing—Original Draft, Writing—Review & Editing. MRE: Investigation, Resources, Visualization, Writing—Review & Editing, Supervision, Project administration, Funding acquisition. MHR: Investigation, Resources, Visualization, Writing—Review & Editing, Supervision, Project administration, Funding acquisition.

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Resentera, A.C., Esquivel, M.R. & Rodriguez, M.H. New insights into the thermal behavior and stability of ammonium bifluoride: non-isothermal thermokinetic analysis. J Therm Anal Calorim 148, 4333–4344 (2023). https://doi.org/10.1007/s10973-023-12054-y

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