Abstract
Neutron diffractions were performed on a sample of a fourth-stage ${\mathrm{HNO}}_{3}$-graphite intercalation compound at room temperature and at low temperature. This compound is known to undergo a crystallographic transformation at approximately 250 K from its known room-temperature structure, which belongs to the space group R3\ifmmode\bar\else\textasciimacron\fi{}m, (${D}_{3d}^{5}$), to an unknown low-temperature structure. The observed neutron diffractions and calculated structure factors are studied and the low-temperature structure is determined. It is found that the structure is trigonal and belongs to the space group P${3}_{1}$21 (${D}_{3}^{4}$). .AE
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