High-temperature thermodynamic and transport properties of the mixed conductor

Mogni, L.; Fouletier, Jacques; Prado, F.; Caneiro, A.

doi:10.1016/j.jssc.2005.06.010

Cited by 36 publications

(78 citation statements)

References 28 publications

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“…These differences do not seem to follow the same behavior for thin and thick layers, as for the 50 nm layers the conductivity is higher for the film deposited on STO substrate, while the contrary occurs for the 335 nm layers, a fact for which we do not have a clear explanation. Nevertheless, all the La 2 NiO 4+␦ films presented higher conductivity values than those published for bulk polycrystalline samples, 6,8,[30][31][32][33][34][35] and the maximum conductivity close to 330 S/cm was largely above the reported values to date for single-crystal samples along the a-b plane ͑maximum Ϸ 200 S/cm͒. 36 This fact seems to confirm the high quality of our samples.…”

Section: P29supporting

confidence: 82%

Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

García

Burriel

Bonanos

et al. 2008

J. Electrochem. Soc.

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Epitaxial c-axis oriented La 2 NiO 4+␦ films were deposited onto SrTiO 3 and NdGaO 3 substrates by the pulsed injection metal organic chemical vapor deposition technique. Experimental conditions were optimized in order to accurately control the composition, thickness, and texture of the layers. X-ray diffraction was used to confirm the high crystalline quality of the obtained material. Electrical characterizations were performed on thin ͑50 nm͒ and thick ͑335 nm͒ layers. The total specific conductivity, which is predominantly electronic, was found to be larger for the thinner films measured ͑50 nm͒, probably due to the effect of the strain present in the layers. Those thin films ͑50 nm͒ showed values even larger than those observed for single crystals and, to our knowledge, are the largest conductivity values reported to date for the La 2 NiO 4+␦ material. The oxygen exchange kinetics was studied by the electrical conductivity relaxation technique, from which the surface exchange coefficient was determined.

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Section: P29supporting

confidence: 82%

Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

García

Burriel

Bonanos

et al. 2008

J. Electrochem. Soc.

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“…Small mobility values give evidence to rather strong localization of electrons on manganese cations. In contrast with other non-stoichiometric perovskites with a wide forbidden gap, e.g., ferrites, where the concentration of charge carriers depends mostly on deviation δ from stoichiometry [36,37], calcium manganite CaMnO 3−δ is distinguished by a considerable difference in the activation energy for conductivity and mobility. This feature is related with the band gap, which is small enough in both orthorhombic and cubic phases, so that a rather large amount of thermally excited electrons may appear at heating and take part in the conduction process at elevated temperatures.…”

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confidence: 88%

Electron transport in CaMnO3 − δ at elevated temperatures: a mobility analysis

Goldyreva

Леонидов

Патракеев

et al. 2013

J Solid State Electrochem

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The drift mobility of electron charge carriers in oxygen non-stoichiometric manganite CaMnO 3− δ was calculated by combining the total electrical conductivity and oxygen non-stoichiometry data at 700-950°С and oxygen partial pressure varying between 10 −6 and 1 atm. The carrier concentration changes with pressure and temperature were obtained with the help of the earlier-developed defect model involving reactions of oxygen exchange and thermal excitation of manganese sites. The activation energy for mobility is found to increase with oxygen non-stoichiometry. High-temperature electron transport properties of the manganite CaMnO 3−δ can be explained in terms of activated jumps of n-type small polarons in adiabatic regime. The relatively small mobility of charge carriers is explained by strong localization of polarons on manganese sites.

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“…Recently, the crystal chemistry and mixed conducting properties of Sr 3 Fe 2 O 7−δ and the solid solution Sr 3−x La x Fe 2−y Co y O 7−δ have been studied for 0 ≤ x ≤ 0.3 and 0 ≤ y ≤ 1.0 [2,5]. The parent compound Sr 3 Fe 2 O 7−δ exhibits a large oxygen non-stoichiometry, δ ∼ 1.0 at T = 1000°C and pO 2 ∼ 10 − 5 atm [6], which increases up to δ = 1.5 for the Co-doped sample with y = 1.0 [7]. More interestingly, the crystal structure tolerates the large oxygen non-stoichiometry values without any change in the symmetry [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…The parent compound Sr 3 Fe 2 O 7−δ exhibits a large oxygen non-stoichiometry, δ ∼ 1.0 at T = 1000°C and pO 2 ∼ 10 − 5 atm [6], which increases up to δ = 1.5 for the Co-doped sample with y = 1.0 [7]. More interestingly, the crystal structure tolerates the large oxygen non-stoichiometry values without any change in the symmetry [6,7]. Following this trend, it is expected that the partial substitution of Ni for Fe will also lead to high oxygen nonstoichiometry values due to the difficulty of stabilizing the Ni 3+/4+ oxidation state compared to that of Fe 3+/4+ , improving the oxide-ion conductivity of the Sr 3 Fe 2 O 7−δ phase.…”

Section: Introductionmentioning

confidence: 99%