Development of apatite-type oxide ion conductors

摘要: Research into materials displaying oxide ion conductivity is attracting considerable attention due to their potential technological applications in devices such as Solid Oxide Fuel Cells. In this paper, recent work on apatite-type conductors reviewed, showing that a wide range of cation substitutions are possible, the flexibility apatite structure accommodating sizes. The studies these doped samples show achieve high conduction, non-stoichiometry terms vacancies and/or oxygen excess required, with latter resulting highest conductivities. contrast most common conductors, e.g. perovskite and fluorite which conduction proceeds via vacancies, research systems suggests involves interstitial ions. With further optimization materials, particularly Ge-containing systems, significant improvements likely, leading very real possibility application electrolytes fuel cell other applications. © 2005 Japan Chemical Journal Forum Wiley Periodicals, Inc. Chem Rec 4: 373–384; 2004: Published online InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.20028