Abstract
The ability to achieve different charge-transport properties in oxygen-deficient perovskites, an important class of materials in the fuel cell technology, has been demonstrated through manipulation of the defect-order. This correlation has been investigated through the synthesis of a new non-centrosymmetric oxygen-deficient perovskite, CaSrFeGaO6-δ, as well as its centrosymmetric analogue, Ca2FeGaO6-δ. X-ray photoelectron spectroscopy and iodometric titration studies indicate the same degree of oxygen-deficiency in both compounds. Neutron diffraction shows the transformation of the defect-arrangement, leading to variation in the orientation of tetrahedral chains in the material structure. The variation in the defect-order results in remarkable changes in charge-transport properties, where CaSrFeGaO6-δ shows significantly greater conductivity than Ca2FeGaO6-δ at room temperature. Variable-temperature electrical conductivity in a wide temperature-range, 25 °C–800 °C, points to semiconducting behavior for both materials, where the superior conductivity of CaSrFeGaO6-δ persists in the entire temperature-range.
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