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Low Temperature Conductivity of Ca‐Doped KCl Crystals Influenced by Segregation Processes
Author(s) -
Fröhljch F.,
Hensel G.
Publication year - 1967
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.19670240216
Subject(s) - conductivity , ion , doping , precipitation , mole fraction , thermal conductivity , materials science , analytical chemistry (journal) , electrical resistivity and conductivity , fraction (chemistry) , chemistry , thermodynamics , mineralogy , chromatography , composite material , physics , optoelectronics , organic chemistry , quantum mechanics , meteorology
By conductivity measurements of Ca doped KCl crystals between 20 and 90 °C it is shown that the conductivity isotherms may be described by the association theory only for small Ca concentrations below 6 × 10 −5 mole fraction Ca/KCl. The effect of the OH ions is given here in terms of characteristic deviations. For higher Ca concentrations the shape of the conductivity isotherms depends on the history of the crystals. By investigations of crystals with suitable thermal pretreatment it is shown that the shape of the isotherms, and especially the slow temporal decrease of the conductivity of quenched specimens, may be explained by precipitation processes of the Ca ions.