Funct. Mater. 2018; 25 (1): 151-157.
Peculiarities of thermal solid-phase transformations of hydrogenphosphates Co(II)-Mn(II)
National University of Life and Environmental Sciences of Ukraine, 17 Geroev Oborony Str., 03041 Kyiv, Ukraine
Peculiarities of thermal solid-phase transformations of Co1-xMnxHPO4·1.5 H2O (0 ≤ x ≤ 0.45), which accompanying the formation of a final product of thermolysis - anhydrous diphosphate solid solution with composition β-(Co1-xMnx)2P2O7 (0 < x le; 0.45) are established. It is shown that low-temperature α-modification of the diphosphate is the first formed during heat treatment of the hydrogenphosphates Co1-xMnxHPO4·1.5H2O with 0 <x ≤ 0.15. Crystalline β-(Co1-xMnx)2P2O7 (x≤0.15) is formed only after the polymorphic transformation of the α-form into the β-form. The formation of β-(Co1-xMnx)2P2O7 with 0.15 < x ≤ 0.45 occurs bypassing the α-form. Free phosphoric acid during the heat treatment Co1-xMnxHPO4·1.5H2O (0 < x ≤ 0.45) are is not formed.
1. T.Kanazawa, Inorganic Phosphate Materiales, Elsevier, New York (1989).
2. Y.Chang, N.E.Shi, S.Zhao et al., ACS Appl. Mater. Interfaces, 34, 22534 (2016). https://doi.org/10.1021/acsami.6b07209
3. L.Robertson, Etude de Pigments Thermochromes Autour du Cobalt II. Material Chemistry. Universite Sciences et Technologies, Bordeaux (2010).
4. N.M.Antraptseva, L.N.Shegrov, N.V.Rybtseva et al., Ukr. Khim. Zh., 60, 358 (1993).
5. L.N.Shegrov, V.V.Pechkovskiy, E.D.Dzuba, Zh. Prikl. Khim., 44, 465 (1971).
6. R.U.Patent 2046093, 29 (1995).
7. N.M.Antraptseva, N.V.Solod, Functional Materials, 23, 657 (2016). https://doi.org/10.15407/fm23.04.468
8. N.M.Antraptseva, N.V.Solod, V.A.Povshuk, Functional Materials, 22, 322 (2015). https://doi.org/10.15407/fm22.03.322
9. V.A.Logvinenko, F.Paulik, I.Paulik, Quasi-equilibrium Thermogravimetry in Modern Inorganic Chemistry. Nauka, Novosibirsk (1989) [in Russian].
10. V.V.Pechkovskiy (Ed.), Atlas of IR Spectra of Phosphates: Condensed of Phosphates, Nauka, Moscow (1985) [in Russian].
11. JCPDS. Powder Diffraction File Inorganic Phases. Published by the JCPDS International Centre for Diffraction Data, Swarthmere, USA, k. 77-1244 (1986).
12. M.Harcharras, A.Ennaciri, F.Capitelli et al., Vibration. Spectrosc., 33, 189 (2003). https://doi.org/10.1016/j.vibspec.2003.09.001
13. A.N.Lazarev, Vibrational Spectra and Structure of Silicates, Nauka, Leningrad (1968) [in Russian].
14. T.Stefanidis, A.G.Nord, Acta Cryst., C40, 1995 (1984). https://doi.org/10.1107/S0108270184010374