Phase Stability and Mechanisms of Transformation of La-Doped γ-Alumina

Inorganic Chemistry
Tianqi RenOlivia A Graeve

Abstract

We report the phase stability of cubic γ-Al2O3with respect to lanthanum dopant amount and describe a complete phase transition sequence up to a temperature of 1800 °C, which proceeds from La-doped γ-Al2O3to LaAlO3/γ-Al2O3to LaAl11O18. For this purpose, lanthanum contents from 0.81 to 10.0 atom % were incorporated into Al2O3powders. X-ray diffraction analyses show that only γ-Al2O3phase was present after heat treatment at 1000 °C for 2 h with 0.81, 1.68, 2.24, and 2.62 atom % lanthanum concentrations. The phase stabilization can be mainly attributed to the combined effects of small crystallite size of the Al2O3powders and the presence of the lanthanum dopant, which occupies the Al2O3octahedral sites. At compositions of 3.63, 5.00, 7.49, and 10.0 atom %, the amount of LaAlO3phase formed by the solid phase reaction between Al2O3and La3+ions becomes detectable under X-ray diffraction.

References

Mar 2, 2010·Biomaterials·Olivia A GraeveKatelyn C Glass
Mar 17, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Kaiyun JiangJochen M Schneider
Mar 29, 2011·ACS Applied Materials & Interfaces·Raghunath KanakalaOlivia A Graeve
Dec 14, 2015·ACS Biomaterials Science & Engineering·Luz A Zavala-SanchezOlivia A Graeve

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