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- W2091268597 abstract "La 2 (Ce x Zr 1-x ) 2 O 7 powders were synthesized by the Pechini routine with citric acid as a chelating agent. TG-DTA, XRD and SEM were used to characterize as-prepared powders. Experimental results show that the crystalline structures of La 2 (Ce x Zr 1-x ) 2 O 7 transform to cubic fluorite phase with Ce substitution for Zr from x=0.1 to 1.0, no longer keeps the cubic pyrochlorite structure of La 2 Zr 2 O 7 . La 2 (Ce x Zr 1-x ) 2 O 7 powders present nanoporous low-density microstructurally, and successively lump-like, fluff-like and cotton-like morphologically with the increase of citric acid addition, this typical nanoporous microstructure results from a pore-crating mechanism initiated by self-propagation reactions between citric acids and nitrates. It is shown that the thermal conductivity k of powder compacts decreases sharply down from 1/10 to 1/32 of that of its single crystal bulk. as compact porosity increases from 60% to 95%. Therefore thermal barrier coatings (TBCs) of La 2 (Ce x Zr 1-x ) 2 O 7 with such nanoporous structures by an appropriate processing may work with quite a high insulative performance and very promising for TBC applications of high-efficiency and large propulsion engines." @default.
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- W2091268597 date "2013-11-01" @default.
- W2091268597 modified "2023-10-18" @default.
- W2091268597 title "Preparation of La<sub>2</sub>(Ce<sub>x</sub>Zr<sub>1-x</sub>)<sub>2</sub>O<sub>7</sub> Nano-Porous Powders via Citric Acid Derived Sol-Gel Processing" @default.
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- W2091268597 doi "https://doi.org/10.4028/www.scientific.net/amr.833.197" @default.
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