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A topotactic reaction can be defined as "a transformation in which one crystalline phase is converted into another with a definite and reproducible crystallographic  orientation relationship between the two". Such a definition is in agreement with the official definition of topotaxy given by the International Union of Crystallography [20] and carries no implications regarding the transformation  mechanism.

[20] Int. Union of Crystallography, Acta Cryst. A 33  ( 1977 ) 681.

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