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I'm looking for a solvate that changes its solvation property when being dried. One example of such a material is gypsum:

  • at temperatures up to 250°C it becomes γ-anhydrite which will slowly hydrate to a hemihydrate.
  • at temperatures above 250°C it becomes β-anhydrite which will not hydrate again.

However the temperature range is too high to use it as example in my thesis.

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