Phase Evolution in the Transformation of Atomically Mixed Versus Ball‐Milled Mixtures of Nanopowders in the Formation of Composite MO· 3Al2O3 Spinels: Bottom‐Up Processing is Not Always Optimal

Richard Laine

Nathan J Taylor, Andrew J Pottebaum, Veli Uz, and Richard M Laine (2014)

Journal of the American Ceramic Society, 97(11):3442-3451.

Liquid-feed flame spray pyrolysis (LF-FSP) provides atomically homogeneous mixed metal powders with 30–40 nm average particle sizes, often producing kinetic phases due to the high quench rate As produced LF-FSP Al 2 O 3-rich spinels, such as MgO· 3 Al 2 O 3, form an Al 2 O 3-rich metastable single-phase spinel. On heating, the powders phase separate to form MAl 2 O 4 and α-Al 2 O 3. Compacts of MO· 3 Al 2 O 3 (M= Co, Ni, Mg) were produced and sintered to evaluate the final duplex microstructure. The same composition ...

bottom-up processing, composites, nanopowders