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Ammonium halides NH 4 Cl, NH 4 F, and NH 4 Br
Author(s) -
Tikhomirova G. V.,
Babushkin A. N.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301582
Subject(s) - halide , alkali metal , ammonium , chemistry , ammonium chloride , bromide , inorganic chemistry , ammonia , chloride , fluoride , electrical resistivity and conductivity , atmospheric temperature range , analytical chemistry (journal) , thermodynamics , organic chemistry , electrical engineering , engineering , physics
The resistance of ammonium chloride (NH 4 Cl), fluoride (NH 4 F) and bromide (NH 4 Br) is investigated at pressures from 20 to 50 GPa in the temperature range 7400 K. The transition from high‐resistance to low‐resistance state was found at pressures of about 15 GPa for NH 4 Br, 27 GPa for NH 4 Cl, and 42 GPa for NH 4 F, respectively. The characteristic temperature and pressure of the transition are shown to depend on the duration of the pressure treatment. All the ammonium halides show metal‐like behaviour under high pressures similar to that of alkali halides. The non‐monotonic temperature dependence of the resistivity, which disappears after sufficiently long pressure treatment, indicates the existence of intermediate states.