Synthesis, crystal structure, and thermal stability of double borate Na 3 ErB 2 O 6

Alexey K. Subanakov; Evgeniy V. Kovtunets; Bair G. Bazarov; Jibzema G. Bazarova

doi:10.15826/chimtech.2021.8.4.02

Synthesis, crystal structure, and thermal stability of double borate Na₃ErB₂O₆

Alexey K. Subanakov, Evgeniy V. Kovtunets, Bair G. Bazarov, Jibzema G. Bazarova

Abstract

Double borate Na₃ErB₂O₆ was synthesized by the solid-state reaction. The crystal structure of Na₃ErB₂O₆ was refined by the Rietveld method: P2₁/c, a = 6.49775(14) Å, b = 8.50424(17) Å, c = 12.0067(3) Å, β = 118.4797(9)°, Z = 4. The crystal structure of Na₃ErB₂O₆ consists of –[ErO₆]_∞-chains along the "b" axis, which are linked by BO₃ triangles in a three-dimensional framework. Sodium atoms occupy empty positions inside the channels. The thermal behavior of Na₃ErB₂O₆ was studied in detail in the range of 25–1150 °C range by DSC and TG methods. Na₃ErB₂O₆ congruently melts at 1116 °C. Based on the results of DSC measurements, three reversible phase transitions were found for Na₃ErB₂O₆.

Keywords

sodium rare-earth borate; solid-state reaction; crystal structure; Rietveld refinement; thermal analysis

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DOI: https://doi.org/10.15826/chimtech.2021.8.4.02

Copyright (c) 2021 Alexey K. Subanakov, Evgeniy V. Kovtunets, Bair G. Bazarov, Jibzema G. Bazarova