Zur thermischen Dehydratisierung von Lithiumdihydrogenphosphat, -hydrogendiphosphat und -cyclophosphat-Hydraten

Thermal Dehydration of Lithium Dihydrogenphosphate, -Hydrogen-diphosphate, and -Cyclophosphate Hydrates On heating lithium dihydrogenphosphate, LiH₂PO₄, is converted to lithium polyphosphate, (LiPO₃)_n · H₂O [2–5]. Seeding LiH₂PO₄ with lithium cyclohexaphosphate, Li₆P₆O₁₈, the thermal dehydration proceeds structurally controlled to pure Li₆P₆O₁₈. On heating lithium hydrogen-diphosphate, Li₃HP₂O₇, reacts to Li₄P₂O₇ form III and lithium cyclotetraphosphate, Li₄P₄O₁₂ form II , which ist converted to Li₆P₆O₁₈ at higher temperatures. The thermal dehydration of Li₂H₂P₂O₇ and of the cyclophosphate hydrates Li₃P₃O₉ · 3 H₂O, Li₄P₄O₁₂ · (8 and 6) H₂O, Li₆P₆O₁₈ · (6 and 4) H₂O and Li₈P₈O₂₄ · (10 and 6) H₂O are described.