Abstract
D.c. electrical conductivity studies have been reported in Na2Ti3O7 in the temperature range 370–750 K. Three distinct regions have been identified in the log(σT) versus 1000/T plots, the lowest temperature region being proposed to be due to electronic hopping conduction involving loose electrons of Ti3O 2−7 groups, the intermediate region to associated extrinsic ionic conduction through dilated interlayer space and the highest temperature region to modified interlayer ionic conduction, the modification being affected by loose oxygens from Ti3O 2−7 groups. The room-temperature electron paramagnetic resonance (EPR) investigations have been interpreted in terms of manganese substitution in the lattice. For a lower percentage of doping the substitution of manganese ions occur as Mn3+ at Ti4+ sites, whereas for a higher percentage of doping, Mn2+ ions predominantly occupy the interlayer Na+ sites. The dilation of interlayer space has further been proposed to occur due to a Ti4+ substitution of manganese ions.
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Pal, S., Chand, P. & Pandey, S.D. Electrical conductivity and electron paramagnetic resonance investigations in manganese-doped polycrystalline Na2Ti3O7 . J Mater Sci: Mater Electron 2, 89–93 (1991). https://doi.org/10.1007/BF00694757
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DOI: https://doi.org/10.1007/BF00694757