Natural gas (NG) is predominantly methane and consists of several kinds of hydrocarbon. NG hydrates synthesized from NG incorporate several kinds of hydrocarbon molecules into the host lattice constructed by water molecules. The precise crystal structure analysis of NG hydrates has rarely been performed because the crystal structure becomes more complicated. Neutron beam has high transmission even at low energy. Neutron scattering can easily occur even in samples packed into the thick vanadium container (thickness: 1mm). In this study, the NG hydrate sample was synthesized from granular deuterated ice (D2O ice), in order to suppress of incoherent neutron scattering from H atoms, under the pressurized NG. The crystal structure analysis was performed under changing temperature from 10 K to 277 K.
