AbstractNitrogen adsorption and mercury intrusion methods have been employed to study the influence of thermal treatment over the temperature range 25–800°C on the development of porosity in basic zirconium sulphate. Such treatment leads to the progressive development of mesoporosity in the solid associated with the elimination of bidentate ligands.All the basic sulphates outgassed at temperatures within the above range exhibit low‐pressure hysteresis in their nitrogen adsorption isotherms as well as a diminution in crystallinity. It is suggested that this indicates a reorganisation at the molecular level brought about by thermal treatment. Not only does this cause the breakdown of the sheet‐like structure of the original solid with the consequent loss of its long‐range crystalline order, but it also leads to the development of mesoporosity in the interstices between the small crystallites generated by such molecular disint
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