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- W4289596154 abstract "Using reverse non-equilibrium molecular dynamics simulations, we have determined the dependences on temperature and pressure of the thermal conductivity tensors for the monoclinic γ and ɛ polymorphs of hexanitrohexaazaisowurtzitane (HNIW or CL20). A recently developed non-reactive force field [X. Bidault and S. Chaudhuri, RSC Adv. 9, 39649–39661 (2019)], designed to study polymorphism and phase transitions in CL20, is employed. The effects of temperature and pressure are investigated between 200 and 500 K and up to 0.5 GPa for γ-CL20 and 2 GPa for ɛ-CL20. In order to obtain the full thermal conductivity tensor, κij, for the monoclinic crystals, four distinct heat propagation directions are used. We find that κij for both polymorphs is more isotropic than for other energetic molecular crystals, including α- and γ-RDX, β-HMX, and PETN, with a maximum difference of 9.8% between orientations observed at 300 K and 0 GPa for γ-CL20 and a maximum difference of 4.8% for ɛ-CL20. The average thermal conductivity, κ̄, of ɛ-CL20 is 6.4% larger than that of γ-CL20 at 300 K and 0 GPa. Analytic linear functions of the inverse temperature and the pressure are provided, which fit the data well and can be used to predict the thermal conductivity of both polymorphs for any orientation, pressure, and temperature in and around the fitting range. Our predictions agree reasonably well with the limited available experimental data, for which the polymorph type is unknown." @default.
- W4289596154 created "2022-08-03" @default.
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- W4289596154 date "2022-08-01" @default.
- W4289596154 modified "2023-10-16" @default.
- W4289596154 title "Thermal conductivity tensor of <b> <i>γ</i> </b> and <b> <i>ɛ</i> </b>-hexanitrohexaazaisowurtzitane as a function of pressure and temperature" @default.
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- W4289596154 doi "https://doi.org/10.1063/5.0105161" @default.
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