SYNTHESIS AND ELECTRICAL CONDUCTIVITY OF FLUORIDE-CONDUCTING PHASES SrSnF4 AND PbxSr1-xSnF4

Authors

DOI:

https://doi.org/10.15421/jchemtech.v33i1.311813

Keywords:

fluoride-conducting phases, tin, strontium, lead fluorides, synthesis, electrical conductivity

Abstract

In the article it is proposed to synthesize free of impurity phases complex fluoride SrSnF4 by sintering lead and strontium fluorides in an equivalent ratio at temperatures higher than temperature of its phase transition from cubic modification into tetragonal (623 K). The duration of synthesis to obtain SrSnF4 free from impurity phases at 773 K is 1 hour, and at 823 K – half an hour. Synthesis at temperatures lower than temperature of phase transition is associated with the formation of impurity phases different in composition and structure from SrSnF4. The conductivity of such samples at 293 K is almost an order of magnitude higher than the conductivity of SrSnF4, which is free from impurity phases (1.18∙10-5 S/cm, Ea = 0.28 eV). The synthesis of fluoride-conducting phases PbxSr1-xSnF4 is proposed to be carried out by the method of sintering the initial components in a given ratio in two stages. First, the initial mixture is sintered in the temperature range of 423÷473 K for an hour. Then the temperature is raised to 773÷823 K and the reaction mixture is sintered for another hour. The crystal lattice of PbxSr1-xSnF4 samples of solid solutions of the isovalent substitution synthesized in this way, with the content of the substituent of 0 ˂ x £ 0.25, corresponds to tetragonal lattice (P4/nmm) and is similar to SrSnF4. At a higher content of the substituent (0.25 ˂ x £ 0.30), the symmetry of the crystal lattice does not change, but corresponds to another structural type (β-PbSnF4). The highest conductivity (1.12∙10-3 S/cm at 293 K) and the lowest activation energy (0.063 eV) has the Pb0.25Sr0.75SnF4 phase, which corresponds to the region where the structural type of the crystal lattice is rearranged with increasing of content of the substituent.

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Published

2025-04-15

Issue

Vol. 33 No. 1 (2025): Journal of Chemistry and Technologies

Section

Electrochemistry

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