The thermodynamic properties of some metal fluorides solid-electrolyte galvanic-cell studies

Rezukhina, T.N.; Sisoeva, T. F.; Holokhonova, L.I.; Ippolitov, E. G.

doi:10.1016/0021-9614(74)90233-x

Cited by 34 publications

(2 citation statements)

References 12 publications

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“…as electrode in a galvanic cell (ref. [1]), as solid membrane in a gas sensor [2] and as fluoride ion-selective electrode [3,4]. With the advance of microelectronic techniques to manufacture, for instance, ion-selective electrodes, a growing demand for suitable solid-state inner membrane comacts has emerged.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 1984

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“…It is worth mentioning that the coating treatment used should satisfy the following points: (I) strong adhesion to magnesium alloy substrate, (II) provide corrosion resistance, and (III) no cytotoxicity. In addition, for stable degradation of the material within the physiological environment, the corrosion products should also have good biocompatibility assessment results [27]. Li et al [28] found that Mg fluoride coating in 3.5% NaCl solution improved the bioactivity of the samples.…”

Section: Discussionmentioning

confidence: 99%

In Vivo Corrosion Behavior of Biodegradable Magnesium Alloy by MAF Treatment

et al. 2021

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Coating treatment plays an irreplaceable role in propelling the clinical application of magnesium alloys. This experiment was designed in order to observe the anticorrosion behavior of magnesium fluoride coating in rats. The MgF2 layer was prepared on the surface of AZ31 magnesium alloy in saturated NH4HF2 solution by microarc fluorination (MAF) at 190 V. The cross-sectional SEM, EDS, and XRD analysis indicated that the alloy surface was covered with MgF2. Meanwhile, SEM observation was used to compare the magnesium alloy samples before and after treatment, and it was found that the samples after coating were flatter and smoother. Two sets of experiments were carried out with the subjects, 6-week-old male rats. So that the untreated AZ31 samples and the microarc fluorinated AZ31 samples could be buried under the muscle layer individually. The volume changes and surface morphology of the corroded samples were monitored dynamically using micro-CT over a 16-week period in vivo. Comparison of results between the two sets of samples presented that the corrosion of the microarc fluoridated samples was much slower than that of the untreated ones. The MAF coating was shown to be effective in controlling the corrosion rate and progression of the magnesium alloy.

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