The structure of deuterated ammonia has been determined as a function of pressure up to 24 GPa using powder neutron-diffraction techniques. The presence of an isostructural transition at approximately 18 GPa is confirmed and ascribed to a slight displacement of one D atom. As a result, the H bond formed by this D atom changes angle and becomes nearly straight (178 degrees) at 24 GPa. A departure from the molecular C-3v symmetry is also detected which is further supported by the evolution of the Raman spectra.
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Indian Inst Technol, Dept Phys & Meteorol, Kharagpur 721302, W Bengal, IndiaIndian Inst Technol, Dept Phys & Meteorol, Kharagpur 721302, W Bengal, India
Kundu, S.
Das, A.
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Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, IndiaIndian Inst Technol, Dept Phys & Meteorol, Kharagpur 721302, W Bengal, India
Das, A.
Nath, T. K.
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Indian Inst Technol, Dept Phys & Meteorol, Kharagpur 721302, W Bengal, IndiaIndian Inst Technol, Dept Phys & Meteorol, Kharagpur 721302, W Bengal, India
Nath, T. K.
Nigam, A. K.
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Tata Inst Fundamental Res, Bombay 400005, Maharashtra, IndiaIndian Inst Technol, Dept Phys & Meteorol, Kharagpur 721302, W Bengal, India