Thermal Expansion and Phase Transitions in Na3H(SO4)2 Sulfate in the Low-Temperature Range

N. V. Dmitrieva, R. S. Bubnova, S. K. Filatov, A. P. Shablinskii, M. G. Krzhizhanovskaya

Research output: Contribution to journalArticlepeer-review


The thermal behavior of Na3H(SO4)2 is studied in the temperature range –180..220°C in a pre-vacuum. At 180°C, the compound decomposed into a mixture of phases: Na2SO4 (Cmcm), Na2SO4 (P63/mmc), Na2SO4 (Fddd), and Na2S2O7. The maximal thermal expansion was observed near the α33 axis. The anisotropy of thermal expansion sharply decreased together with the increase in temperature.

Original languageEnglish
Pages (from-to)395-397
Number of pages3
JournalGlass Physics and Chemistry
Issue number5
StatePublished - 18 Oct 2019

Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


  • high temperature X-ray diffraction
  • phase transitions
  • sulfates
  • thermal expansion

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