Affiliation:
1. Research Centre in Chemistry (CIQUP), Institute of Molecular Sciences (IMS) Department of Chemistry and Biochemistry Faculty of Sciences University of Porto Rua do Campo Alegre P-4169-007 Porto Portugal
2. Department of Chemistry Inorganic Chemistry Chair of Small Molecule and Energetic Materials Research LMU Munich Butenandtstraße 5–13 81377 Munich Germany
Abstract
AbstractThe thermodynamic characterization of dihydroxylammonium 5,5′‐bitetrazole‐1,1′‐dioxide (TKX‐50) was reinvestigated. Although TKX‐50 is one of the most promising new‐generation energetic materials, contradictory reports are found in the literature with regard to its solid enthalpy of formation. The standard (po=105 Pa) molar enthalpy of formation of crystalline TKX‐50, (175.3±1.9) kJ ⋅ mol−1, was determined experimentally based on the measured standard massic energy of combustion, determined through static‐bomb combustion calorimetry. Additionally, the standard molar enthalpy of sublimation of TKX‐50, at T=298.15 K, (165.0±2.4) kJ ⋅ mol−1, was derived from vapor pressure measurements determined by a Knudsen mass‐loss effusion technique. Finally, different approaches were used in attempts to calculate the standard enthalpy of formation of TKX‐50 in the solid state. A critical overview and assessment of the data on the enthalpy of formation of TKX‐50 is also presented.
Subject
General Chemical Engineering,General Chemistry
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