Crystallization of sodium chloride dihydrate (hydrohalite)

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Abstract

The existing literature on the phase diagram of NaCl-H 2 O system and the study of crystallization of sodium chloride dihydrate NaCl·2H 2 O (mineral name hydrohalite) is briefly reviewed first. Then a simple and fast procedure for NaCl·2H 2 O crystallization is described to obtain large enough (∼1 cm long) single crystals in amount of hundreds grams in one batch. This procedure can stimulate the investigation of physico-chemical properties of hydrohalite. The characterization of the crystallized samples with X-ray (single-crystal and powder) diffraction did allow estimating the average volume thermal expansion of hydrohalite as of ∼70∙10 –6 K −1 over temperature range from 100 to 250 K.

Original languageEnglish
Pages (from-to)17-23
Number of pages7
JournalJournal of Crystal Growth
Volume517
DOIs
Publication statusPublished - 1 Jul 2019

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Keywords

  • A1. Phase diagrams
  • A1. X-ray diffraction
  • A2. Natural crystal growth
  • B1. Sodium chloride
  • SEA-ICE
  • Phase diagrams
  • H2O
  • THERMAL-EXPANSION
  • X-ray diffraction
  • Sodium chloride
  • PHASE
  • Natural crystal growth
  • NACL

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