Comparison of the electrical conductivity of bulk and film Ce1–xZrxO2–? in oxygen-depleted atmospheres at high temperatures
نویسندگان
چکیده
Abstract Featuring high levels of achievable oxygen non-stoichiometry ? , Ce 1? x Zr O 2? solid solutions (CZO) are crucial for application as storage materials in, example, automotive three-way catalytic converters (TWC). The use CZO in form films combined with simple manufacturing methods is beneficial view device miniaturization and reducing TWC costs. In this study, a comparative microstructural electrochemical characterization film conventional bulk performed using X-ray diffractometry, scanning electron microscopy, impedance spectroscopy. were composed grains dimensions 100 nm or less, the samples had about 1 µm large grains. electrical behavior nanostructured coarse-grained ( > 0) was qualitatively similar at temperatures under atmospheres. This explained by dominating effect addition, which masks effects on conductivity, enhances reducibility, favors strongly electronic conductivity even 200 K lower than those pure ceria. CeO 2 much higher different trends dependence temperature atmospheres their counterparts. For latter, dominantly electronic, significant T < 700 °C. Nanostructural peculiarities assumed to induce more pronounced ionic conduction medium partial pressures relatively low temperatures. defect interactions conditions discussed framework models
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ژورنال
عنوان ژورنال: Journal of Materials Science
سال: 2021
ISSN: ['1573-4803', '0022-2461']
DOI: https://doi.org/10.1007/s10853-021-06348-5