Analysis of the preparation of In-doped CaZrO3 using a peroxooxalate complexation method


Rij, Leen van and Winnubst, Louis and Jun, Le and Schoonman, Joop (2000) Analysis of the preparation of In-doped CaZrO3 using a peroxooxalate complexation method. Journal of Materials Chemistry, 12 (11). pp. 2515-2521. ISSN 0959-9428

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Abstract:The wet chemical synthesis of CaZr0.9In0.1O32a powders via a peroxo-oxalate complexation method has been studied in detail using different techniques, i.e. TG-DTA, XRD, FT-IR, BET, SEM, EDX, and non-isothermal densi®cation. Using these techniques, the different reaction steps in the calcination process have been clarified. After drying the precipitated complex at 150 ³C for 3 h, a mixture of calcium oxalate and an amorphous zirconia phase is found. Between 200 and 450 ³C, the calcium oxalate decomposes into calcium carbonate. In the temperature range 450±800 ³C, the calcium carbonate decomposes into CaO, while a crystalline zirconia phase appears (CaZr4O9). In this temperature range, the formation of CaZrO3 is already observed. Further increasing the calcination temperature to 1000 ³C leads to a binary mixture of CaZrO3 and CaIn2O4. When the calcination temperature is increased to around 1500 ³C, the CaIn2O4 phase dissolves into the calcium zirconate to form the desired CaZr0.9In0.1O32a. All compacts sintered at 1550 ³C for 10 h show single-phase CaZr0.9In0.1O32a, independent of the calcination temperature. The morphology of the sintered compacts, however, varies with the calcination temperature, due to the presence or absence of a reactive sintering step around 1300 ³C. Powders calcined at 1000 ³C show a larger grain size in the sintered compact than powders calcined at 1450 or 1550 ³C.
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Copyright:© 2000 The Royal Society of Chemistry
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