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The structural transition from NaCl to CsCl type in cesium hydride
Author(s) -
Bashkin I. O.,
Degtyareva V. F.,
Dergachev Yu. M.,
Ponyatovskii E. G.
Publication year - 1982
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.2221140252
Subject(s) - metastability , caesium , atmospheric pressure , phase transition , phase diagram , chemistry , volume (thermodynamics) , thermodynamics , hydride , lattice (music) , phase (matter) , analytical chemistry (journal) , inorganic chemistry , hydrogen , chromatography , oceanography , physics , organic chemistry , geology , acoustics
The CsH volume is measured in dependence on pressure up to 35 kbar. A structural NaCl to CsCl type transition associated with a volume jump of 8.6% is found at a pressure of about 6.5 kbar. The T — P phase diagram of CsH is plotted in the temperature range 200 to 525 K. The high pressure phase at liquid nitrogen temperature remains metastable down to atmospheric pressure. The lattice parameter of this phase is a = 3.820 Å at 100 K and atmospheric pressure, the lattice parameter of the initial (NaCl type) phase is a = 6.365 Å under the same conditions.