thermalscombtnatton- ( nh4)5[lnp4o12)2]nh2o,где ln - sm/tm
The thermal properties of complex compounds of the type are studied (NH<sub>4</sub>)<sub>5</sub>[Ln(P<sub>4</sub>O<sub>12</sub>)<sub>2</sub>]-nH<sub>2</sub>O where Ln Is Sm,Tm. The thermal behavior of soluble complex compounds depends on the nature of REE in the complex compound and are decomposed with the formation of cyclocarbonate ammonium and polyphosphate REE. Thermal behavior of soluble complex compounds, as well as similar complex Soderini, containing in its composition of ammonia, depends on the nature of REE in the complex connection. Compounds containing REE with smaller ionic radii (Tm,Yb),with 5000 decompose with the formation of cyclocarbonate ammonium polyphosphate and REE compounds, including all the other REE under the same conditions and are decomposed with the formation of cyclocarbonate ammonium ( NH<sub>4</sub>) <sub>3</sub>Р<sub>3</sub>О<sub>9</sub> and mixed ammonium polyphosphate and REE - NH<sub>4</sub> Ln (PO<sub>3</sub>)<sub>4</sub>. Obtaining double polyphosphates by the method developed by us, i.e. by thermal decomposition of compounds of type ( NH<sub>4</sub>)<sub>5</sub>[Ln(P<sub>4</sub>O<sub>12</sub>)<sub>2</sub>]-nH<sub>2</sub>O is, in our opinion, the most simple.