Thermoelectric Properties of Some Mixed Oxides

Lessoff, H.; Kersey, Y.; Horne, R. A.

doi:10.1063/1.1730531

Cited by 10 publications

(3 citation statements)

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“…Our conductivity data on polycrystalline Fe203 (Table 1) compare well with those reported in the literature [40][41][42]. A break in the log a--l/T plot is noted at 450°C, the activation energies being 0.64 and 1.15 eV at low and high temperatures respectively.…”

Section: Cr203 Mn203 and Fe203supporting

confidence: 87%

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Electrical Transport in Rare Earth Ortho-Chromites, -Manganites and -Ferrites

Rao

Wanklyn

Rao

1995

Solid State Chemistry

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Rare earth ortho-chromites, -manganites and -ferrites are p-type semiconductors with conductivities in the range 10-4-10-' ohm-' cm-'. The conductivity in each series of perovskites decreases with the increasing atomic number of the rare earth. The ionic contribution to conductivity is small in all the three series of solids. None of these solids exhibits intrinsic behavior up to --1000°C. The conductivity behaviors of these rare earth compounds reflect the known crystallographic, dielectric and magnetic transitions in these materials. Seebeck coefficients in these compounds are large, typical of narrow-band materials; the Seebeck coefficients show marked changes at temperatures where magnetic and dielectric transitions occur. The electrical transport properties of all the three series of rare earth compounds are essentially controlled by the d-electrons of the transition elements which show localized behavior. This conclusion is in agreement with the results from optical spectra and the predictions of Goodenough. In all these compounds small polarons seem to be responsible for the conduction.

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Section: Cr203 Mn203 and Fe203supporting

confidence: 87%

“…[n] A break in the plot occurs around 450°C, possibly due to the change in the mechanism of conduction [40]. No break was observed at the Neel point, 680°C.…”

Section: Rare Earth Orthochromitesmentioning

confidence: 99%

Electrical Transport in Rare Earth Ortho-Chromites, -Manganites and -Ferrites

Rao

Wanklyn

Rao

1995

Solid State Chemistry

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“…Al(OH)3 = Al*Fe + (30H)0 (7) The Al3+ addition, therefore, could slightly change the mobility at best; eq 7 is consistent with the electrical behavior of Al(III).…”

Section: Resultssupporting

confidence: 61%