Anomalous high temperature electrical conductance of NaCl

Allnatt, A. R.; Pantelis, P.

doi:10.1016/0038-1098(68)90111-7

Cited by 43 publications

(9 citation statements)

References 10 publications

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“…also feel that the 10-parameter fit of the conductivity of pure NaCl by Allnatt and Pantelis (1968) is unlikely to yield reliable values of transport parameters.…”

Section: Analysis Of the Intrinsic Conductivitymentioning

confidence: 95%

“…We shall be able to demonstrate this point in more detail later by applying a similar computation to the intrinsic conductivity results for KI. Despite this demonstration of the dangers of computer fitting, Allnatt and Pantelis (1968) computed a fit to the conductivity of pure NaCl crystals using six parameters and, furthermore, used the values of a discrepancy of about 3% between experiment and calculation to generate four more parameters based on the assumption that charge transport was due to cation Frenkel as well as Schottky defects. Our experience with computer fits, detailed below, is such that we feel that it would be difficult to place much reliance on these 10 computed parameters.…”

Section: Introductionmentioning

confidence: 99%

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Ionic conductivity of potassium iodide crystals

Chandra¹,

Rolfe²

1970

Can. J. Phys.

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The electrical conductivity of pure KI, K I + SrIz, and K I + K z C 0 3 single crystals was measured as a function of temperature. A method for calculating ionic transport parameters from these results was developed, assuming that the conductivity was due entirely to the motion of positive and negative ion vacancies, and including the effect of association and Coulomb interaction between oppositely charged defects. It was shown that the Coulomb interaction had an appreciable effect on the high-temperature intrinsic conductivity, and the extrinsic conductivity of heavily doped crystals. Calciilation of transport parameters from intrinsic-conductivity measurements alone gave erroneous results. From the agreement (within experimental error) between the experimental and calculated results, it was concluded that the only defects taking part in the conduction process were Schottky defects. The following parameters were calculated: Schottky-defect formation enthalpy k, = 2.21 eV, entropy ss = 0.765 x eV/deg; positive ion vacancy migration enthalpy A/zl = 0.63 eV, entropy As, = 0.136 x lo-' evjdeg; negative ion vacancy migration enthalpy A/r2 = 1.29 eV, entropy As2 = 0.805 x eV/deg; association of divalent cations and positive ion vacancies enthalpy x = 0.54 eV, entropy q = 0.190 x eV/deg.

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“…also feel that the 10-parameter fit of the conductivity of pure NaCl by Allnatt and Pantelis (1968) is unlikely to yield reliable values of transport parameters.…”

Section: Analysis Of the Intrinsic Conductivitymentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Ionic conductivity of potassium iodide crystals

Chandra¹,

Rolfe²

1970

Can. J. Phys.

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“…It is interesting to speculate about reasons for the non-random deviations between our conductivity results and those predicted by the STIA and the Lidiard theory. Although some systematic experimental error could be responsible for this discrepancy, earlier conductivity studies on KCl by Beaumont and Jacobs [14] and by Fuller et al [12] and on NaCl by Allnatt and Pantelis [8] have revealed similar non-random deviations between theory and experiment. Because of the unlikely event, that a systematic error of the required magnitude is common to four separate laboratories, it appears unreasonable to attribute the discrepancy to this factor alone.…”

Section: Discussionmentioning

confidence: 93%

“…and E is the static dielectric constant of the crystal. In general, the ionic conductivity of an alkali halide crystal can be written in terms of the concentration and mobilities of the free charge species [8] as follows : o=2:ntpipCcc, ( 8 ) where ni is the concentration of the i-th charged species, qi the charge on that species, and p i its mobility. Considerations of an ionic lattice in which defects occur show that the Concentration of the charged species is related directly to the concentration of defects in the lattice, and, moreover, that the mobility of the particular species in question is related to the jump probability of that species in the lattice.…”

Section: Theorymentioning

confidence: 99%

Ionic Conductivity of Sodium fluoride

Bauer

Whitmore

1970

Physica Status Solidi (b)

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The electrical conductivity of single crystals of pure NaF and NaF doped with CaF, has been measured as a function of temperature from 450 to 970 "C. Analyses of these data by a leastsquare method to yield the usual defect parameters have been based on two models: 1. a perfect crystal perturbed by isolated cation vacancies, isolated anion vacancies, divalent cation impurity, and divalent cation impurity-cation vacancy complexes, and 2. one which includes the long-range Coulomb interactions between isolated defects in addition to the four defects of the first model. More satisfactory agreement with the experimental results is apparent when the latter model is employed, but non-random deviations between experiment and theory were evident for both models over the entire temperature range of observation.La conductivite Blectrique de purs mono-crystaux de NaF e t de NaF dopes par CaF, a BtB mesurbe en fonction de la temperature de 450 ZL 970 "C. L'analyse de ces donnkes par la mbthode des moindres carrbs pour conduire aux constantes habituelles relatives aux dbfauts crystallins a btB basbe sur deux modeles: 1. un crystallparfait perturb6 par des lacunes cationiques isolbes, par des lacunes anioniques isolees, par des cations Btrangers bivalent8 e t par des complexes cation &ranger bivalent + lacune cationique e t 2. un modele qui comprend l'interaction coulombienne It longue distance entre les dkfauts isolbs en plus des quatre dbfauts du premier modele. Un accord plus satisfaisant avec les rhsultats experimentaux apparait quand le deuxieme modele est employb, mais des deviations systbmatiques entre l'expbrience et la theorie existent pour les deux modeles dans le domaine de temperature Btudib.

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“…The conductivity cell was essentially the same as that used for the workon KCl [3] and NaCl [8]. The platinum electrodes and specimen were kept under mild compression in a holder made only of silica in the heated portion of the cell.…”

Section: Introductionmentioning

confidence: 99%

Ionic Conductivity of Crystalline CsBr

Chadwick¹,

McNicol²,

Allnatt³

1969

Physica Status Solidi (b)

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The electrical conductivity of pure CsBr was measured between 295 and 895 OK and the results analysed by least squares. Schottky disorder provides an adequate description of the results for the intrinsic conductivity except at the highest temperatures. The predicted diffusion coefficients arc compared with the experimental values of Lynch [I].On a mesuri! la conductivit6 6lectrique du CsBr pur entre 295 et 895 O K et les rksultats ont bt6 analyses par la m6thode des plus petits carr6s. Le d6sordre Schottky fournit une description suffisante des r6sultats pour la conductivith intrinskque except6 pour les temperatures plus 61evBes. On compare les coefficients de diffusion pr6dits avec les r6sultats trouvbs experimentalement par Lynch [l].

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Anomalous high temperature electrical conductance of NaCl

Cited by 43 publications

References 10 publications

Ionic conductivity of potassium iodide crystals

Ionic conductivity of potassium iodide crystals

Ionic Conductivity of Sodium fluoride

Ionic Conductivity of Crystalline CsBr

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