Abstract
Nanocrystalline alumina–zirconia powders were prepared by a modified chemical route using sucrose, polyvinyl alcohol (PVA) and metal nitrates followed by a post calcination process. The process involved dehydration of Al3+–Zr4+ ions-sucrose–PVA solution to a highly viscous liquid which on decomposition process produced a black precursor material. The obtained precursor were then calcined at various temperatures: 1,050, 1,100, 1,150, 1,200 and 1,250 °C for different soaking times (1, 2, 4 h) in air. The formation of a nanocomposite composed of α-alumina (~20 nm) and tetragonal (t) zirconia (~19 nm) crystallites were confirmed for the sample calcined at 1,200 °C for 2 h, based on our XRD and TEM results. However, for the samples calcined below 1,150 °C the composite formed were composed of metastable alumina (γ, δ, θ) as well as t-zirconia phases. Interestingly, the zirconia phase retained its tetragonal structure for all the samples calcined above 1,050 °C. This is possibly related to the “size effect” and reduction of surface enthalpy of the zirconia crystallites surrounded by Al3+ cations.
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We would like to acknowledge the help of Nanomaterials Group, Advanced Materials Research Center (AMRC), IUST. Further, the support of Iranian Nanotechnology Initiative Council (INIC) is also acknowledged.
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Beitollahi, A., Hosseini-Bay, H. & Sarpoolaki, H. Synthesis and characterization of Al2O3–ZrO2 nanocomposite powder by sucrose process. J Mater Sci: Mater Electron 21, 130–136 (2010). https://doi.org/10.1007/s10854-009-9880-9
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DOI: https://doi.org/10.1007/s10854-009-9880-9