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Crystal chemistry of ultraphosphates

After a short introduction relating the evolution of ultraphosphate chemistry along time we report what is the present state of our knowledge of this chemistry, giving as completely as possible the main crystallographic features of all the today known ultraphosphates. Then we describe what are the atomic frameworks of these very complex phosphoric anions. A short survey of the abundant literature induced by the discovery of the interesting properties of the lanthanide ultraphosphates as efficient laser materials is also given