Sodium ion transport and phase transitions in glaserite-type phosphate Na 3 Sm(PO 4 ) 2

Valeria M. Razgulyaeva; Olga N. Leonidova; Аlexander P. Tyutyunnik; Vladimir A. Litvinov; Rina F. Samigullina; Ilia A. Leonidov

doi:10.15826/chimtech.9889

Sodium ion transport and phase transitions in glaserite-type phosphate Na₃Sm(PO₄)₂

Valeria M. Razgulyaeva, Olga N. Leonidova, Аlexander P. Tyutyunnik, Vladimir A. Litvinov, Rina F. Samigullina, Ilia A. Leonidov

Abstract

The phosphate Na₃S_m(PO₄)₂ with a glaserite-type structure was prepared by solid state reaction in air. At room temperature, analysis of powder X-ray diffraction data shows that the structure is orthorhombic with the Pbc2₁ space group and the unit cell parameters: a = 15.9365(6) Å, b = 13.94096(30) Å and c = 18.4138(5) Å. Differential thermal analysis in conjunction with dilatometry enabled the identification of two-phase transitions occurring at approximately 650 °С (α → β transition) and 986 °C (β → γ transition). As a result of the high-temperature transition to the γ-form, the lattice expands by more than 1.5%. Employing a combination of AC impedance spectroscopy and the Tubandt method, Na⁺ cations were unequivocally identified as the mobile charge carriers within the glaserite-type Na₃Sm(PO₄)₂. The most pronounced increase in ionic conductivity is observed during the β → γ phase transition, which is concomitant with a substantial expansion of the Na₃Sm(PO₄)₂.

Keywords

sodium ionic conductivity; glaserite-type structure; phase transition; Na3Sm(PO4)2

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DOI: https://doi.org/10.15826/chimtech.9889

Copyright (c) 2026 Valeria M. Razgulyaeva, Olga N. Leonidova, Аlexander P. Tyutyunnik, Vladimir A. Litvinov, Rina F. Samigullina, Ilia A. Leonidov

This work is licensed under a Creative Commons Attribution 4.0 International License.

Chimica Techno Acta, 2014–2025
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