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首页> 外文会议>Fourth International Symposium on Ionic and Mixed Conducting Ceramics, null >PREPARATION TECHNIQUES AND IONIC TRANSPORT PROPERTIES OF CERIA-BASED ELECTROLYTES
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PREPARATION TECHNIQUES AND IONIC TRANSPORT PROPERTIES OF CERIA-BASED ELECTROLYTES

机译：铈基电解质的制备技术和离子传输性能

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摘要

Preparation of ceria-based electrolytes with trivalent dopants was examined using (ⅰ) high temperatures and pressures, (ⅱ) sol-gel, and hydrothermal route. Stabilization of trivalent ions (e.g., Tb~(3+) ) having an ionic size closer to Ce~(4+) in ceria lattice was achieved at high temperatures and pressures. Nd~(3+), which is slightly larger than Ce~(4+), could be doped in the ceria lattice at a concentration up to 40 % by a sol-gel method. For dopants such as Bi~(3+), which have a larger structural mismatch to Ce~(4+), hydrothermal reactions were found to readily form ceria-based electrolytes with solubilities as high as 50 %. The lattice parameter increased nonlinearly when dopant size was close to Ce~(4+), while a linear relationship between lattice parameter and dopant content was obtained for a larger structural mismatch. The variations of ionic conductivities and activation energies of these electrolytes were found to be closely related to the chemical nature of dopants, elemental substitutions, and relative content of oxygen vacancy Voe and defect associations.
机译：使用（ⅰ）高温高压，（ⅱ）溶胶-凝胶法和水热法检查了具有三价掺杂剂的二氧化铈基电解质的制备。在高温和高压下，实现了二氧化铈晶格中具有更接近Ce_（4+）的离子尺寸的三价离子（Tb〜（3+））的稳定化。 Nd〜（3+）比Ce〜（4+）稍大，可以通过溶胶-凝胶法将其掺杂到二氧化铈晶格中，浓度最高可达40％。对于与Ce〜（4+）具有较大结构失配的Bi〜（3+）等掺杂剂，发现水热反应很容易形成溶解度高达50％的二氧化铈类电解质。当掺杂剂尺寸接近Ce〜（4+）时，晶格参数非线性增加，而对于较大的结构失配，晶格参数与掺杂剂含量之间呈线性关系。发现这些电解质的离子电导率和活化能的变化与掺杂剂的化学性质，元素取代以及氧空位Voe的相对含量和缺陷缔合密切相关。

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