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.