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. 2014 Apr 22;4:4726. doi: 10.1038/srep04726

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(a) LaBaCo₂O₆. (b) LaBaCo₂O_5.5. (c) LaBaCo₂O₅. In (a)–(c) the atoms are distinguished by colored spheres: Co = cyan sphere, O = red sphere, Ba = blue sphere, La = orange sphere, the half-red/grey spheres in (b) indicate the oxygen site occupancy is half, and oxygen vacancy = grey spheres in (c). (d) Sequence of the CoO₂, BaO and LnO layers in LnBCO. The oxygen-vacancy-exchange diffusion between adjacent LnO and CoO₂ layers is expected to be faster than that between adjacent CoO₂ and BaO layers (indicated by large and small arrows, respectively) because more oxygen vacancies are present in the LnO layers.