Study of the Structural Characteristics of α- Alumina Doped with Different Cations | ||||
| Egyptian Journal of Solids | ||||
| Article 7, Volume 27, Issue 2, 2004, Page 233-243 PDF (110.21 K) | ||||
| DOI: 10.21608/ejs.2004.149848 | ||||
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| Abstract | ||||
| Three sets of α-alumina (α- Al2O3) doped with different cations namely, Al2O3: xMnO, Al2O3: xMoO and Al2O3: xCdO have been prepared with x ranges between 0.01 to 0.19 mol. The structure of the prepared samples was refined by applying the full pattern fitting of Rietveld method using FullProf program. It was found that the nonstoichiometric behaviour appeared from the refinable value of the occupancy of Al site, reflects the amount of lattice defects created in the samples. The amount of the dopant, incorporated into the host alumina, depends not only on the ionic radii but also on the dopant valancy. The effect of dopant concentration on the unit cell parameters has been discussed on the basis of the amount of incorporated cations into the host alumina. It was found, that the more occupancy of the dopant at Al-site, the more the c/a ratio, the more is the distortion of the lattice. | ||||
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