文献类型：期刊文献

英文题名：Analysis of the preparation of In-doped CaZrO₃ using a peroxo-oxalate complexation method

作者：van Rij, L; Winnubst, L; Jun, L; Schoonman, J

机构：[1]Delft Univ Technol, Inorgan Chem Lab, NL-2628 BL Delft, Netherlands;[2]Univ Twente, Inorgan Mat Sci Grp, Fac Chem Technol, NL-7500 AE Enschede, Netherlands;[3]E China Univ Sci & Technol, Dept Inorgan Mat, Shanghai 200237, Peoples R China

年份：2000

卷号：10

期号：11

起止页码：2515

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000090052000016)】；

语种：英文

外文关键词：Calcination; Calcium zirconate; Co-precipitation; Doping; Indium

摘要：The wet chemical synthesis of CaZr0.9In0.1O3 - alpha 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 densification. Using these techniques, the different reaction steps in the calcination process have been clarified. After drying the precipitated complex at 150 degreesC for 3 h, a mixture of calcium oxalate and an amorphous zirconia phase is found. Between 200 and 450 degreesC, the calcium oxalate decomposes into calcium carbonate. In the temperature range 450-800 degreesC, 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 degreesC leads to a binary mixture of CaZrO3 and CaIn2O4. When the calcination temperature is increased to around 1500 degreesC, the CaIn2O4 phase dissolves into the calcium zirconate to form the desired CaZr0.9In0.1O3 - alpha. All compacts sintered at 1550 degreesC for 10 epsilonh show single-phase CaZr0.9In0.1O3 - alpha, 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 degreesC. Powders calcined at 1000 degreesC show a larger grain size in the sintered compact than powders calcined at 1450 or 1550 degreesC.