Stability of α-Alumina photonic structures formed at low temperatures utilizing chromia-seeding
Pasquarelli RM, Waleczek M, Nielsch K, Schneider GA, Janssen R (2016)
Publication Type: Conference contribution
Publication year: 2016
Journal
Publisher: American Ceramic Society
Book Volume: 256
Pages Range: 179-186
Conference Proceedings Title: Ceramic Transactions
Event location: Vancouver, BC
ISBN: 9781119234586
Abstract
Emerging applications of ordered, macroporous oxide photonic structures for thermal barrier coatings, structural coloration, and thermophotovoltaics requires the stability of these features at operating temperatures. However, in high-Temperature environments (>1000 °C), these structures can exhibit significant undesired microstructural changes (phase changes, sintering, grain growth, etc.) that result in a loss of the desired properties. An approach for lowering the formation temperature of α-Alumina in such structures was demonstrated by seeding with chromia by secondary infiltration from precursor solutions. Seeds of α-chromia, which formed at 500 °C, successfully lowered the α-Alumina formation temperature from 1200 to 800 °C by heterogeneous nucleation. Upon heating to 1200 °C, these chromia-seeds went into solid-solution with the alumina structure. However, in contrast to unseeded structures, the resulting microstructures were prone to grain growth and loss of photonic properties upon heating at 1400 °C,.
Involved external institutions
Germany (DE)How to cite
APA:
Pasquarelli, R.M., Waleczek, M., Nielsch, K., Schneider, G.A., & Janssen, R. (2016). Stability of α-Alumina photonic structures formed at low temperatures utilizing chromia-seeding. In Hua-Tay Lin, James Hemrick (Eds.), Ceramic Transactions (pp. 179-186). Vancouver, BC, CA: American Ceramic Society.
MLA:
Pasquarelli, Robert M., et al. "Stability of α-Alumina photonic structures formed at low temperatures utilizing chromia-seeding." Proceedings of the Advanced and Refractory Ceramics for Energy Conservation and Efficiency - 11th International Symposium on Ceramic Materials and Components for Energy and Environmental Applications, CMCEE 2015, Vancouver, BC Ed. Hua-Tay Lin, James Hemrick, American Ceramic Society, 2016. 179-186.
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