Tailored metal-ceramic nanocomposites prepared by redox cycling of polycrystalline Ni-doped yttria stabilized zirconia

SCRIPTA MATERIALIA

卷:112

Article

Morrissey, Amy¹  O'Brien, James R.²  Reimanis, Ivar E.¹ 

[1] Colorado Sch Mines, Met & Mat Engn Dept, Colorado Ctr Adv Ceram, Golden, CO 80401 USA

[2] Off Grid Res, San Diego, CA 92111 USA

关键词: Nanocomposite;    Oxidation;    Magnetic properties;    Ni-YSZ;   

DOI  :  10.1016/j.scriptamat.2015.09.025

来源: Elsevier

【 摘 要 】

We demonstrate it possible to tailor unique metal-ceramic nanocomposites through redox cycling of Y2O3-stabilized ZrO2 containing 0.5 molar percent NiO (below the solubility limit). Upon the first reduction, Ni2+ ions precipitate as metallic Ni-0 at pores, grain boundaries, or within the grain interiors with specific size ranges (similar to 5 nm/similar to 30 nm/similar to 200 nm) for each. Upon oxidation, Ni2+ ions form, but their distribution is not the same as the original microstructure. In particular, NiO forms, and subsequent reduction leads to a distribution of metallic Ni different from that in the first reduction. One can ratchet the dissolution/precipitation behavior to form particular nanoscale arrangements. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

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