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The review summarizes the data on the chemical composition, crystal structure and functional properties of layered rare-earth hydroxides (LRHs), a new family of anion-exchangeable inorganic compounds. Comprehensive information is given on methods for the synthesis of LRHs including hydrothermal and hydrothermal-microwave treatment. Particular attention is paid to the methods of chemical design of hybrid functional materials based on LRHs. Prospects for fabrication of phosphors, heterogeneous catalysts and biomedical materials based on LRHs are analyzed. The bibliography includes 295 references.

Hydrothermal crystallization pathways of amorphous ceric phosphate gels were found to be determined by the ammonia concentration in a reaction medium. This allows for highly selective hydrothermal synthesis of various finely crystal-