Abstract
Urea or biuret was added to the thermal synthetic system of Rhabdophane-type neodymium and cerium phosphates. The mixture of a rare earth compound, a phosphorus compound, and an additive [CO(NH2)2 or NH(CONH2)2] was heated at 150°C or 300°C for 20 hr, and the thermal products were analyzed by the XRD, FT-IR, and BET methods. H3PO4 and (NH4)2HPO4 were used for phosphorus compounds, and for rare earth compounds, Nd2O3, Nd(NO3)3 · 6H2O, NdCl3 · 6H2O, Nd2(CO3)3 · 8H2O, CeO2, Ce(NO3)3 · 6H2O, CeCl3 · 7H2O, and Ce2(CO3)3 · 8H2O were used. Urea and biuret worked not only as a dispersing agent but also as a reactant. By the addition of biuret, the thermal products changed from cerium oxide to Rhabdophane-type cerium phosphate in the system using CeCl3 · 7H2O and (NH4)2HPO4. Addition of urea or biuret influenced the specific surface area of Rhabdophane-type neodymium and cerium phosphates. Furthermore, to increase the reactivity of the raw solid materials, mechanical treatment was performed. The mixture of diammonium hydrogenphosphate and a rare earth compound was ground with water and then heated. The influence of the addition of urea or biuret was also studied in these systems.
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REFERENCES
M. Tsuhako, S. Ikeuchi, T. Matsuo, I. Motooka, and M. Kobayashi, Bull. Chem. Soc. Jpn. 52, 1034 (1979).
I. A. Bonder, A. I. Domanskii, L. P. Mezentseva, M. G. Degen, and N. E. Kalinina, Russ. J. Inorg. Chem. 21, 1126 (1976).
S. Ohashi, Kogyo Kagaku Zasshi 66, 538 (1963).
E. Thilo and I. Grunze, Z. Anorg. Allg. Chem. 290, 209 (1957).
R. C. L. Mooney, Acta Cryst. 3, 337 (1950).
H. Onoda, H. Nariai, A. Moriwaki, H. Maki, and I. Motooka, J. Mater. Chem. 12, 1754, (2002).
A. Takenaka, S. Kikui, I. Motooka, and H. Nariai, Nihon Kagaku Kaishi 11, 774 (1998).
A. Takenaka, H. Sawa, M. Hirata, A. Yamamoto, I. Motooka, and H. Nariai, Phosphorus Res. Bull. 8, 107 (1998).
A. Takenaka, Y. Tsunoda, and H. Sawa, Phosphorus Res. Bull. 9, 107 (1999).
A. Takenaka and S. Yoshida, Phosphorus Res. Bull. 9, 111 (1999).
F. Cardellini, V. Contini, and G. Mazzone, J. Mater. Sci. 31, 4175 (1996).
P. Balaz, T. Havlik, Z. Bastl, J. Briancin, and R. Kammel, J. Mater. Sci. Lett. 15, 1161 (1996).
E. G. Avvakumov, E. T. Devyatkina, and N. V. Kosova, J. Solid State Chem. 113, 379 (1994).
N. Hashimoto, H. Yoden, and S. Deki, J. Am. Ceram. Soc. 76, 438 (1993).
W. Kim, Q. Zhang, and F. Saito, J. Mater. Sci. 35, 5401 (2000).
K. Kudaka, K. Iizuka, T. Sasaki, and H. Izumi, J. Am. Ceram. Soc. 83, 2887 (2000).
H. Nariai, M. Tada, M. Tsuhako, and I. Motooka, Phosphorus Res. Bull. 5, 125 (1995).
H. Nariai, S. Shibamoto, H. Maki, and I. Motooka, Phosphorus Res. Bull. 8, 101 (1998).
H. Onoda, Doctoral Thesis, Kobe University, Kobe, Japan (2002).
H. Onoda, H. Nariai, H. Maki, and I. Motooka, Mater. Chem. Phys., 78, 400 (2003).
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Onoda, H., Nariai, H., Maki, H. et al. Addition of Urea or Biuret on Synthesis of Rhabdophane-Type Neodymium and Cerium Phosphates. Journal of Materials Synthesis and Processing 10, 121–126 (2002). https://doi.org/10.1023/A:1021982412249
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DOI: https://doi.org/10.1023/A:1021982412249