Issue 30, 2010

Solid-state reactive sintering mechanism for large-grained yttrium-doped barium zirconateproton conducting ceramics

Abstract

A cost-effective solid-state reactive sintering (SSRS) method has recently been developed to synthesize high quality, fully dense, and large-grained yttrium-doped barium zirconate (BZY) ceramic pellets from the raw materials of BaCO3, ZrO2, Y2O3, and NiO, resulting in total proton conductivities as high as 3.3 × 10−2 S·cm−1at 600 °C under a wet argon atmosphere [J. Tong et al., Solid State Ionics, 2010, 181, 496]. In the present work, the mechanisms for the rapid formation of the cubic perovskite phase of BZY, pellet densification, and grain growth during SSRS synthesis are investigated in detail using a suite of experimental techniques. The pre-reaction addition of NiO to the precursor powders is confirmed to accelerate the formation of the cubic perovksite BZYphase. The rapid and full densification of NiO-modified pellets at relatively low temperature (1350 °C) is ascribed to the formation of the impure phase BaY2NiO5 and its subsequent role as a sintering aid. The dramatic further grain growth after densification is facilitated by the partial decomposition of the BaY2NiO5 (which is located primarily at grain boundaries) and its incorporation into the cubic perovskite structure of BZY.

Graphical abstract: Solid-state reactive sintering mechanism for large-grained yttrium-doped barium zirconate proton conducting ceramics

Article information

Article type
Paper
Submitted
11 Feb 2010
Accepted
11 May 2010
First published
16 Jun 2010

J. Mater. Chem., 2010,20, 6333-6341

Solid-state reactive sintering mechanism for large-grained yttrium-doped barium zirconate proton conducting ceramics

J. Tong, D. Clark, L. Bernau, M. Sanders and R. O'Hayre, J. Mater. Chem., 2010, 20, 6333 DOI: 10.1039/C0JM00381F

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