NMR relaxation, ionic conductivity and the self-diffusion process in barium fluoride

Figueroa, D. R.; Chadwick, Alan V.; Strange, John H.

doi:10.1088/0022-3719/11/1/017

Cited by 85 publications

(20 citation statements)

References 29 publications

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“…This value is in satisfactory agreement with the value 2.0 eV reported by Fielder [9] and the value 2.08 eV reported by Chadwick et al [10]. [3][4][5][6] In the intermediate region the ionic conductivity increases, and the activation enthalpy decreases with increasing dopant concentration (see figs. 3 and 4).…”

Section: "Pure"laf 3 (Samples 1 and 2)supporting

confidence: 91%

“…rare-earth (III) fluorides, exhibit relatively high fluoride ion conductivities. Especially fluorite-type solid solutions based on alkaline-earth fluorides have been studied extensively [5,6]. In previous studies performed in our laboratory, the ionic conductivity of fluorite-type solid solutions of alkaline-earth fluorides doped with LaF 3 or UF 4 has been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Ionic conductivity in tysonite-type solid solutions La1−xBaxF3−x

et al. 1984

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The ionic conductivity of single crystals of tysonite-type solid solutions Lal_xBaxFa_x(O • x • 0.095) has been studied parallel and perpendicular to the crystallographic c axis in the temperature range 293-1300 K. Three regions can be discerned in the compositional dependence of the ionic conductivity: (i) the "pure" crystal, in which at room temperature no exchange occurs between different types of anion sites in the tysonite structure; (ii) an intermediate region (0 < x < 7 X 10 -2) which reveals changes in both the conductivity activation enthalpy and the magnitude of the conductivity; (iii) a concentrated solid-solution region (x > 7 X 10-2), where fluoride ions interchange easily among the different anion sublattices. Diffusion coefficients calculated from ionic conductivity results, are in good agreement with those calculated from 19F NMR measurements. Using the present data, along with 19F NMR data, dielectric relaxation data and structural considerations, mechanisms governing the ionic conductivity are proposed.

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Section: "Pure"laf 3 (Samples 1 and 2)supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Ionic conductivity in tysonite-type solid solutions La1−xBaxF3−x

et al. 1984

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“…3. Instead it has now been shown convincingly that this positb viation relates to a change from intrinsic conductivity by fluoride ion vacancic intrinsic conductivity by fluoride interstitials [29][30][31]37,40]. It should, how~ be pointed out that Carr et al [29] found evidence for slightly higher conduc ties in the region 1120-1250 K (= Tc) than can be modelled with the vacancy to interstitial conductivity change over.…”

Section: Defect Parameters At T Ementioning

confidence: 96%

“…Recently, Carr et al [29] and Figueroa et al [30] studied the ionic conductivity and self-diffusion in BaF 2. These studies led to activation enthalpies that are consistent with the data for fluoride ion vacancies reported by Barsis and Taylor [27].…”

Section: Bafmentioning

confidence: 99%

Retarded ionic motion in flourites

Schoonman

1980

Solid State Ionics

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Metal halides with the fluorite structure attain conductivity values typical of ionic melts far below their melting points, and also go through a second-order transition. Conductivity data for the fluorites are reviewed, and it is shown that the anion vacancies have a large and unique mobility value at the transition temperatures T c. At T c only small concentrations of defects are present, which strongly contradicts the concept of anion-sublattice melting. The conductivity mechanism above T c is discussed in relation with the enhanced ionic motion model developed for concentrated anion-excess solid solutions based upon fluorites. As a consequence of unusually large defect mobilities at T c it is noted that retard ionic motion occurs above T c.

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“…F anions either use interstitial sites or vacancies to diffuse in the cubic structure [47]. Mechanical treatment of the fluorides causes the ionic conductivity to increase by several orders of magnitude [15,16].…”

Section: Complex Fluoridesmentioning

confidence: 99%

Structure and ion dynamics of mechanosynthesized oxides and fluorides

Wilkening

Düvel

Preishuber-Pflügl

et al. 2016

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract:In many cases, limitations in conventional synthesis routes hamper the accessibility to materials with properties that have been predicted by theory. For instance, metastable compounds with local non-equilibrium structures can hardly be accessed by solid-state preparation techniques often requiring high synthesis temperatures. Also other ways of preparation lead to the thermodynamically stable rather than metastable products. Fortunately, such hurdles can be overcome by mechanochemical synthesis. Mechanical treatment of two or three starting materials in high-energy ball mills enables the synthesis of not only new, metastable compounds but also of nanocrystalline materials with unusual or enhanced properties such as ion transport. In this short review we report about local structures and ion transport of oxides and fluorides mechanochemically prepared by high-energy ball-milling.

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NMR relaxation, ionic conductivity and the self-diffusion process in barium fluoride

Cited by 85 publications

References 29 publications

Ionic conductivity in tysonite-type solid solutions La1−xBaxF3−x

Ionic conductivity in tysonite-type solid solutions La1−xBaxF3−x

Retarded ionic motion in flourites

Structure and ion dynamics of mechanosynthesized oxides and fluorides

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