Insight into the Thermodynamic Properties of Promising Energetic HNTO·AN Co-Crystal: Heat Capacity, Combustion Energy, and Formation Enthalpy

Amir Abdelaziz, Ahmed Fouzi Tarchoun, Hani Boukeciat and Djalal Trache
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Amir Abdelaziz: Energetic Materials Laboratory (EMLab), Teaching and Research Unit of Energetic Processes, Ecole Militaire Polytechnique, BP 17 Bordj El-Bahri, Algiers 16046, Algeria
Ahmed Fouzi Tarchoun: Energetic Propulsion Laboratory, Teaching and Research Unit of Energetic Processes, Ecole Militaire Polytechnique, BP 17 Bordj El-Bahri, Algiers 16046, Algeria
Hani Boukeciat: Energetic Materials Laboratory (EMLab), Teaching and Research Unit of Energetic Processes, Ecole Militaire Polytechnique, BP 17 Bordj El-Bahri, Algiers 16046, Algeria
Djalal Trache: Energetic Materials Laboratory (EMLab), Teaching and Research Unit of Energetic Processes, Ecole Militaire Polytechnique, BP 17 Bordj El-Bahri, Algiers 16046, Algeria

Energies, 2022, vol. 15, issue 18, 1-11

Abstract: A novel energetic co-crystal composed of hydrazinium 3-nitro-1,2,4-triazol-5-one (HNTO) and ammonium nitrate (AN), as a composite solid propellant oxidizer, was recently developed to substitute either pure ammonium perchlorate (AP) or nitrate. Unfortunately, the thermodynamic properties of this co-crystal or even the pure HNTO are not available in the open literature. Therefore, in this work, the low-temperature heat capacities of HNTO and HNTO·AN co-crystal were measured in the temperature range from 213.15 K to 378.15 K using differential scanning calorimetry. By fitting the heat capacity data, the thermodynamic functions ? H 298 . 15K , ? G 298 . 15K , and ? S 298 . 15K were derived. In addition, the standard molar energies of combustion ? c U ° of HNTO and HNTO·AN co-crystal were determined, and from the combustion results, the standard molar enthalpies of combustion ? c H m o and formation ? f H m o of these energetic compounds were derived at T = 298.15 K. The set of thermochemical data has been proposed in this work for the first time and will be undoubtedly indispensable information for the development of energetic materials based on HNTO and HNTO·AN co-crystal.

Keywords: ammonium nitrate (AN); hydrazinium 3-nitro-1,2,4-triazol-5-one (HNTO); HNTO·AN co-crystal; calorimetry; heat capacity; combustion; enthalpy of formation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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