The influence of size on physical properties of microcrystals is known from more than 50 years. Nanosized materials (nanoparticles, nanocrystals) have a different properties, e.g. transition temperature, than their coventional coarse-grained polycrystalline or bulk counterparts. During X-ray powder diffraction studies the size induced structural phase transitions to a new, previously unknown phases, are discovered for many nanocrystals. The literature data on 70 phase transitions occurring in 56 nanocrystals are presented in the form of database. Different types of phase diagrams "grain size - transition temperature" are also presented. Several such transitions in nanocrystals of double molybdates and tungstates are discovered in our laboratory.

Part of this work was supported by the Polish Ministry of Science and Higher Education under contract No 1 P03B 078 29.

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