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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Doping strategies to optimise the oxide ion conductivity in apatite-type ionic conductors
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Doping strategies to optimise the oxide ion conductivity in apatite-type ionic conductors

机译：掺杂策略可优化磷灰石型离子导体中的氧化物离子电导率

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The apatite-type phases, La9.33+x(Si/Ge)(6)O26+ 3x/2, have recently been attracting considerable interest as potential electrolytes for solid oxide fuel cells. In this paper we report results from a range of doping studies in the Si based systems, aimed at determining the key features required for the optimisation of the conductivities. Systems examined have included alkaline earth doping on the rare earth site, and P, B, Ga, V doping on the Si site. By suitable doping strategies, factors such as the level of cation vacancies and oxygen excess have been investigated. The results show that the oxide ion conductivities of these apatite systems are maximised by the incorporation of either oxygen excess or cation vacancies, with the former producing the best oxide ion conductors. In terms of samples containing cation vacancies, conductivities are enhanced by doping lower valent ions, Ga, B, on the Si site. The presence of higher valent ions on these sites, e.g P, appears to inhibit the incorporation of excess oxygen within the channels, and so limits the maximum conductivity that can be obtained. Overall the results suggest that the tetrahedral sites play a key role in the conduction properties of these materials, supporting recent modelling studies, which have suggested that these tetrahedra aid in the motion of the oxide ions down the conduction channels by co-operative displacements.
机译：磷灰石型相La9.33 + x（Si / Ge）（6）O26 + 3x / 2作为固体氧化物燃料电池的潜在电解质最近引起了人们的极大兴趣。在本文中，我们报告了基于硅的系统中一系列掺杂研究的结果，旨在确定优化电导率所需的关键特性。所检查的系统包括稀土位置上的碱土掺杂，以及硅位置上的P，B，Ga，V掺杂。通过合适的掺杂策略，已经研究了诸如阳离子空位水平和氧过量的因素。结果表明，通过引入过量的氧或阳离子空位，可以使这些磷灰石体系的氧化物离子电导率最大化，其中前者产生最佳的氧化物离子导体。对于包含阳离子空位的样品，通过在Si位点上掺杂低价离子Ga，B可以提高电导率。这些位点（例如P）上较高价离子的存在似乎抑制了通道内过量氧气的掺入，因此限制了可获得的最大电导率。总体而言，结果表明四面体位点在这些材料的导电特性中起着关键作用，支持了最近的建模研究，这些研究表明这些四面体通过协同位移帮助氧化物离子沿着导电通道向下运动。

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