Journal article
Synthesis of La0.9Sr0.1Ga0.8Mg0.2O2.85 powder by gel combustion route with two-step doping strategy
KTH Royal Institute of Technology, Department of Materials Science and Engineering, Division of Ceramic Technology, SE-10044 Stockholm, Sweden1
Stockholm University, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, SE-10691 Stockholm, Sweden2
A two-step doping strategy was applied to the synthesis of La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM1020) powder by a gel combustion method. The Mg-doped LaGaO3 powder was prepared in the first step, and Sr incorporation in the Mg-doped LaGaO3 powder was done in the second step to obtain the final LSGM1020 powder.
The two-step procedure is effective in preparing higher purity powders than the traditional one-step procedure. Rietveld refinement of X-ray powder diffraction (XRD) patterns shows that incorporation of Mg in LaGaO3 in the first step enlarges the LaGaO3 lattice: this facilitates the incorporation of Sr in the second doping step and thus high purity powder is obtained.
Relatively phase pure LSGM1020 powder with only 3.1% of LaSrGaO4 was obtained after calcination at 1300°C for 5h. Therefore, the two-step doping strategy is an effective procedure for the preparation of LSGM powders with high Sr- and Mg-doping levels.
| Language: | English |
|---|---|
| Year: | 2012 |
| ISSN: | 1873619x and 09552219 |
| Types: | Journal article |
| DOI: | 10.1016/j.jeurceramsoc.2012.01.033 |
