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DC Ionic Conductivity of Potassium Azide
Author(s) -
Maycock J. N.,
Verneker V. R. Pai,
Gorzynski C. S.
Publication year - 1970
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.19700370237
Subject(s) - vacancy defect , enthalpy , ionic conductivity , conductance , ionic bonding , ion , chemistry , conductivity , potassium , pellets , crystal (programming language) , analytical chemistry (journal) , thermodynamics , materials science , crystallography , electrolyte , condensed matter physics , computer science , programming language , physics , organic chemistry , electrode , chromatography , composite material
The electrical conductance of both single crystal and pressed pellets of potassium azide has been measured. The ionic conductance parameters of KN 3 were calculated from samples containing known amounts of Ba 2+ ion impurity. The conventional theory of association was found to be adequate to describe association between Ba 2+ and cation vacancies. A value of 0.2 eV was determined for — ζ, where ζ is the free energy of association of complexes. The following point defect parameters were determined: h , the enthalpy change for the formation of a defect pair = 1.25 eV, Δ h , the enthalpy for migration of a cation vacancy = 0.76 eV, s , the entropy change on the formation of a defect pair = 0.119 × 10 −3 eV deg −1 . Equations describing X 0 , the number of thermally produced defects in a pure crystal, and μ, the mobility of the cation vacancy, both as a function of temperature have been derived.