Theta-phase stabilization by rare-earth and alkali incorporation in sol-gel derived alumina

Tian P, Mueller L, Zitnan M, Sajzew R, Wondraczek L (2021)

Publication Type: Journal article

Publication year: 2021

Journal

International Journal of Applied Glass Science Wiley

Book Volume: 12

Pages Range: 509-518

Journal Issue: 4

DOI: 10.1111/ijag.16231

Abstract

Bottom-up synthesis of alumina suspensions doped with trivalent (Eu3+) or monovalent (K+) ions is reported as a means to generate crystalline transition-phase alumina with increased thermal stability. Dynamic light scattering was used to track the stability of precursor sols, showing how the dissolved cations contribute to the stabilizing double layer and particle separation in the liquid phase. The incorporation of alkali or rare-earth dopants into the alumina structure further influences the thermal conversion and crystallization behavior. The Kissinger activation energy of the θ → α phase transition in Al2O3 indicates an inhibitory effect of Eu3+ and K+ on the formation of the stable α phase, also confirmed by X-ray diffraction. The intensity ratio of the 7F2/7F1 characteristic photoemission bands of Eu3+ was used to probe the local symmetry as a function of calcination temperature to further corroborate this observation.

Authors with CRIS profile

Lothar Wondraczek

Involved external institutions

Friedrich-Schiller-Universität Jena DE Germany (DE)

How to cite

APA:

Tian, P., Mueller, L., Zitnan, M., Sajzew, R., & Wondraczek, L. (2021). Theta-phase stabilization by rare-earth and alkali incorporation in sol-gel derived alumina. International Journal of Applied Glass Science, 12(4), 509-518. https://doi.org/10.1111/ijag.16231

MLA:

Tian, Peijing, et al. "Theta-phase stabilization by rare-earth and alkali incorporation in sol-gel derived alumina." International Journal of Applied Glass Science 12.4 (2021): 509-518.

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