Praseodymium-Substituted Cerium Hydrazine Carboxylate Hydrate

1 Praseodymium-Substituted Cerium Hydrazine Carboxylate Hydrate 

Red ceramic pigments are normally based on cadmium sulfoselenide, which being toxic is banned or restricted in its use in many countries. A need exists, therefore, to prepare an environmental friendly red pigment. Praseodymium doped/substituted ceria is known to be a substitute for cadmium sulfoselenide as red ceramic pigments. Conventionally, 

As the crystal structures of all the rare earth metal hydrazine carboxyl-ates are isomorphous, it is possible to prepare solid solutions of Pr-Ce hydrazine carboxylates. The complexes Cei xPr (N2H3C00)3-3H20, with X = 0-0.5, are prepared by the same procedure used in preparing rare earth metal hydrazine carboxylates as mentioned in Section 4.3.2. Stoichiometric amounts of cerium nitrate and praseodymium nitrate are dissolved in doubly distilled water, and to this a solution of hydrazine carboxylate in hydrazine is added slowly. The mixture is allowed to 

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