Point defect parameters for strontium chloride from ionic conductivity studies

Chadwick, Alan V.; Kirkwood, F.G.; Saghafian, R

doi:10.1051/jphyscol:1980655

Cited by 14 publications

(3 citation statements)

References 6 publications

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“…The procedure outlined above was used to analyse the literature conductivity data for SrCl2 (Chadwick et al 1980) and P-PbF2 (Azimi et al 1984). The Frenkel-defect formation and migration parameters were available from computer least-squares fitting of the low-temperature regions of these data.…”

Section: Analysis Of the Experimental Conductivity Datamentioning

confidence: 99%

“…Here we will investigate the effect on the number of charge carriers, as this can be tested by reference to experimental data. Low-temperature defect thermodynamic parameters and precise conductivity data in the fast-ion region are available for P-PbF2 (Carr et al 1978;Azimi et al 1984) and SrCl2 (Carr et al 1978;Chadwick et al 1980) and these will be used in this investigation.…”

Section: Introductionmentioning

confidence: 99%

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A model for the onset of fast-ion conduction in fluorites

Allnatt

Chadwick

Jacobs

1987

Proc. R. Soc. Lond. A

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The quasielastic neutron scattering from fast-ion conductors with the fluorite structure has been interpreted alternatively as being due to either clusters of defects or to the motion of defects and their associated strain field. In this paper, we examine the hypothesis that the sharp rise in ionic conductivity that occurs in fluorites near the transition temperature ( T c ) from normal to superionic conductivity, is associated with defect clustering. By using lattice simulation techniques it is shown that a wide variety of clusters are stable in SrCl 2 , CaF 2 , SrF 2 , BaF 2 and β-PbF 2 . A cluster consisting of two vacancies, two relaxed lattice ions and three interstitials (which we shall designate 2| 2| 3) is particularly stable. It is shown that the formation of 2| 2| 3 clusters results in an increase in the concentration of vacancies and that this increase can account quantitatively for the rise in conductivity near T c . Our concern is thus with the possible connection of the onset of superionic conduction with defect clustering and we do not attempt, in this paper, any interpretation of the quasielastic neutron scattering.

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Section: Analysis Of the Experimental Conductivity Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A model for the onset of fast-ion conduction in fluorites

Allnatt

Chadwick

Jacobs

1987

Proc. R. Soc. Lond. A

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show abstract

“…Nevertheless, a careful computer analysis of accurate conductivity data can lead to the determination of each of the diffusion coefficients. In addition, a marked improvement to increase the efficiency of the conductivity technique consists to add some suitable impurities like divalent cations or divalent anions in alkali halides [70Ben2,90Hoo], monovalent or trivalent cations in alkaline earth halides [80Cha,86Jac]. For the sake of a better precision, it is advantageous to measure simultaneously the conductivity of a pure crystal together with a doped sample like in the …”

Section: Direct Measurement Of the Haven Ratiomentioning

confidence: 99%