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The thermal dehydration and transformations of the cyclohexaphosphates Nd2P6O18 · 12H2O and Li3Nd3(P6O18)2 · 26H2O are investigated in the range 20–1000°C using differential thermal analysis and high-temperature x-ray diffraction, in conjunction with chromatographic determination of the anion composition of reaction products. The results demonstrate that, during heating, the cyclohexaphosphates convert...
The NdCl3–Li6P6O18–H2O system is studied at 20°C, NdCl3 concentrations of 0.05 to 0.1 mol/l, and Li6P6O18 concentrations of 0.025 to 0.15 mol/l. Simple cyclohexaphosphates with the general formula Nd2P6O18 · mH2O (m = 6, 8, 12) are identified, and the double cyclohexaphosphate Li3Nd3(P6O18)2 · 26H2O is obtained for the first time. Li3Nd3(P6O18)2 · 26H2O has a monoclinic structure with unit-cell parameters...