Defect chemistry of undoped La2CuO4

Hong, D.J.L.; Smyth, D. M.

doi:10.1016/0022-4596(92)90052-w

Cited by 18 publications

(5 citation statements)

References 14 publications

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“…2. Undoped LazCuO4 behaves nearly temperature-independently with metallic character similar to that reported earlier by 10]. The main feature of Cu-sites doping of a 3d transition metal is that each doping has a different: effect on a temperature dependence of electrical conductivity.…”

Section: Resultssupporting

confidence: 65%

The effect of Cu-sites doping on electrical properties of La2CuO4 as thermoelectric material

Seok

Park

1995

J Mater Sci: Mater Electron

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The electrical conductivity and thermoelectric power for solid solutions of La2Cu0.gM0.104 (M = Mn, Fe, Co and Ni) prepared by polymeric precursor synthesis were measured between 300 and 1173 K to test its suitability as a thermoelectric material. Fe-, Mn-and Ni-doped compositions exhibited a metal-semiconductor transition with decreasing temperature, whereas Co doping showed a semiconducting behaviour in the entire temperature range of measurement. With Cu-sites doping in La2CuO4, power factors were not enhanced.

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Section: Resultssupporting

confidence: 65%

The effect of Cu-sites doping on electrical properties of La2CuO4 as thermoelectric material

Seok

Park

1995

J Mater Sci: Mater Electron

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“…Such behaviour was also observed for undoped La 2 CuO 4 [17] and La 2 Cu 0.5 Ni 0.5 O 4+δ [18]. In the latter case it was explained by interaction of charge carriers resulted in non-applicability of the ideal solution model.…”

Section: Xrpd and Tg Studiesmentioning

confidence: 61%

Influence of structural arrangement of R2O2 slabs of layered cuprates on high-temperature properties important for application in IT-SOFC

et al. 2014

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Influence of structural arrangement of R2O2 slabs of layered cuprates on high-temperature properties important for application in IT-SOFC. Ionics, http://dx.doi.org/10.1016/j.ssi. 2014.01.039 Access to the published version may require subscription. N.B. When citing this work, cite the original published paper. Solid State Permanent link to this version:http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva- 103293 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

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“…Several groups have suggested that the predominant defect species are doubly charged oxygen interstitials, based on high temperature electrical conductivity and Seebeck coefficient measurements. [15][16][17] Cordero and co-workers 18 reported that excess O in La 2 -CuO 4+δ already starts forming two different types of defects at very low concentrations, as shown in anelastic spectra. The first defect is observed in the absorption peak with the lowest activation enthalpy, which is visible at the lowest values of doping and is attributed to the hopping of single interstitial ions.…”

Section: What Happens Upon Oxygen Doping: Experimentsmentioning

confidence: 96%

“…What does that hole do? Thus, we are interested in understanding whether the interstitial oxygen atoms 10,[15][16][17][18][19] are O, O -, or O 2-. If we take the hole on the oxide in a chemical sense as O -, one would expect such Ospecies 10 to bond with an oxide (O 2-) ion, to bond with another O -, or to interact in some way with molecular oxygen (O 2 ).…”

Section: The Central Problem: Do We Havementioning

confidence: 99%

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Oxygen Interstitials in Superconducting La₂CuO₄: Their Valence State and Role

Lee

Hoffmann

2005

J. Phys. Chem. A

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The nature of the much debated valence state of an interstitial oxygen atom in oxygen-doped La2CuO4 is the subject of this paper. In model cluster calculations, we studied the position, charge, and spin state of the interstitial oxygen atoms in this superconductor. The models considered allow the interstitial oxygen to move off a symmetrical position, to have varying spin and charge, and to be surrounded by various magnetic environments. UB3LYP calculations show that a model having an interstitial oxygen atom with a total spin of 1 is lowest in energy; the interstitial oxygen atoms here act as stable radicals with a net charge of -1. These results agree with experimental evidence for the paramagnetic behavior for interstitial atoms. The energy associated with a spin flip at a Cu site in our models is lower if interstitial oxygen has a local electron spin density, compared to the case when it does not. We provide a possible explanation for the increase of the doping concentrations of interstitial oxygen with a decrease of the Néel temperature of this system. The relative stability of the models we consider depends on their spin states, accompanied by structural changes; this explains indirectly the experimental change of the slope (from 2 to 1.3) of the linear relationship between the hole concentration and the oxygen content. Our results support a stripe phase in high temperature superconductivity; in our calculations, hole doping to the copper oxide layer comes only through the formation of an oxygen interstitial pair, not from any change of the local structural environment and magnetic field around the single interstitial.

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Defect chemistry of undoped La2CuO4

Cited by 18 publications

References 14 publications

The effect of Cu-sites doping on electrical properties of La2CuO4 as thermoelectric material

The effect of Cu-sites doping on electrical properties of La2CuO4 as thermoelectric material

Influence of structural arrangement of R2O2 slabs of layered cuprates on high-temperature properties important for application in IT-SOFC

Oxygen Interstitials in Superconducting La₂CuO₄: Their Valence State and Role

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Defect chemistry of undoped La2CuO4

Cited by 18 publications

References 14 publications

The effect of Cu-sites doping on electrical properties of La2CuO4 as thermoelectric material

The effect of Cu-sites doping on electrical properties of La2CuO4 as thermoelectric material

Influence of structural arrangement of R2O2 slabs of layered cuprates on high-temperature properties important for application in IT-SOFC

Oxygen Interstitials in Superconducting La2CuO4: Their Valence State and Role

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Oxygen Interstitials in Superconducting La₂CuO₄: Their Valence State and Role