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Dielectric Dispersion and Dynamics of Nitrite Ions in K 2 Ba(NO 2 ) 4
Author(s) -
Unruh H.G.
Publication year - 1984
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.2221260114
Subject(s) - dielectric dispersion , dielectric , dispersion (optics) , raman spectroscopy , ion , debye , phase transition , materials science , activation energy , analytical chemistry (journal) , debye model , dispersion relation , phase (matter) , permittivity , chemistry , condensed matter physics , physics , optics , optoelectronics , organic chemistry
Dielectric measurements reveal Debye‐like dispersions of the main permittivities below room temperature at audio‐frequencies, the activation energy of the corresponding motions of nitrite ions being 0.5 eV. The role of the three non‐equivalent NO 2 groups in the phase transition at about 203 K is investigated using Raman‐spectroscopic results on internal NO 2 modes. A model is proposed that includes freezing of certain NO 2 groups with static disorder.