Preparation of nano-Cr2−xAlxO3 (x=0–1) solid solution powders by using citrate-dispersant method

Chromium enriched peraluminous glasses: Incorporation limit, crystalline phase equilibrium and impact of chromium on the rheological properties of the glass

“…The principal crystalline phase had a layered shape, with a pure Cr 2 O 3 core and a surrounding layer of Cr 2-x Al x O 3 (with 0 < x < 0.6). The XRD diffractograms were peak-matched to the Cr 1.28 Al 0.72 O 3 phase detailed in the JCPDS card n°04-007-6151 (Figure 11, in Appendix), which had also been studied and elaborated using different techniques by Zhang et al [21]. The pure Cr 2 O 3 phase was not detected under XRD analysis.…”

Synthesis of Ultrafine Aluminum-Rich Corundum Nanocrystals

“…Using a similar approach, Zhang et al improved upon this result by introducing citric acid to produce amorphous nanoparticles with diameters less than 50 nm in the composition range 0.5 < x < 1. 17 Homogeneous solid solutions for these Cr-rich corundum particles were reported at temperatures as low as 800 °C. Notably, at the highest concentration of aluminum in their work, phase separation was observed after annealing at 800 °C.…”

“…Alternatively, several bottomup synthetic approaches to producing Cr 2x Al 2(1−x) O 3 solid solutions have been proposed. These include sol−gel synthesis, 17 microwave-assisted solvothermal, 18 and co-precipitation 19 to name a few.…”

“…Subsequent thermal treatment at temperatures exceeding 1000 °C produced homogeneous corundum solid solutions while retaining the nanoparticle sizes between 100 and 400 nm. Using a similar approach, Zhang et al improved upon this result by introducing citric acid to produce amorphous nanoparticles with diameters less than 50 nm in the composition range 0.5 < x < 1 . Homogeneous solid solutions for these Cr-rich corundum particles were reported at temperatures as low as 800 °C.…”