2 0 2015 sin fil 0 journal Original Sinditskii, V. P. Filatov, S. A. Kolesov, V. I. Kapranov, K. O. Asachenko, A. F. Nechaev, M. S. Lunin, V. V. Shishov, N. I. Thermochim. Acta 2015 2020-09-29 Combustion behavior and physico-chemical properties of dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate (TKX-50) The physico-chemical characterization (thermal decomposition under non- and isothermal conditions, enthalpy of formation, burning behavior and flame structure) of a new explosive dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate is detailed. Combustion studies have shown that TKX-50 burns slightly faster than HMX and approaches the burning rate of CL-20. The combustion of TKX-50 has been shown to obey mechanism with the leading reaction in the condensed phase. The rates of TKX-50 decomposition in both solid and liquid phases proved to be slightly higher than the corresponding rates of decomposition of RDX. Decomposition of TKX-50 is determined by decomposition of free hydroxylamine formed in the reaction of dissociation of the salt. An intermediate decomposition product is ammonium salt of 5,5'-bis (2-hydroxytetrazole), which further decomposes in the second stage at elevated temperatures. The enthalpy of formation of TKX-50 has been measured with the help of bomb calorimetry, however the resulting value is quite different from the enthalpy reported earlier. Dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate (TKX-50) Thermal decomposition Enthalpy of formation Burning behavior and flame structure Surface temperature Temperature dependence of vapor pressure 10.1016/j.tca.2015.06.019 614 85-92 1 InChI=1S/CO2/c2-1-3 CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide CO2 2 InChI=1S/N2/c1-2 IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen N2 3 InChI=1S/H2O/h1H2 XLYOFNOQVPJJNP-UHFFFAOYSA-N water H2O 4 InChI=1S/O2/c1-2 MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen O2 5 InChI=1S/C2N8O2.2H4NO/c11-9-1(3-5-7-9)2-4-6-8-10(2)12;2*1-2/h;2*2H,1H3/q-2;2*+1 UHTGTYVZCBKFMU-UHFFFAOYSA-N hydroxylammonium 1H,1'H-[5,5'-bitetrazole]-1,1'-bis(olate) TKX-50 di(hydroxylammonium) 5,5'-bistetrazole-1,1'-diolate C2H8N10O4 1 Synthesized by the authors 1 Crystallization from solution 2 97 2 Estimated by the compiler 1 5 1 -1 Crystal 1 2 Ideal gas 2 5 Ideal gas 3 4 Liquid 4 -2 Ideal gas Principal objective of the work AB TRC 8/11/2015 Combustion with oxygen 1 Specific internal energy of reaction at constant volume, J/g Static bomb calorimetry 298.15 5 101.325 6 1 Data file compiler Propagation of evaluated standard uncertainties 95 1 -8704 4 1 67