Chemical deposition of La0.7Ca0.3MnO3±δ films on ceramic substrates

Morilla-Santos, C.; Schreiner, W. H.; Lisboa‐Filho, Paulo Noronha

doi:10.1590/s1516-14392011005000036

Cited by 10 publications

(4 citation statements)

References 27 publications

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“…Thus, the Mn valence states in the manganite can be deduced from the fitted peaks for the Mn 2p 3/2 peak. 29 As shown in Fig. 3(a), Mn 2+ is dominant at the interface region of the LSMO/NiO heterostructure but becomes less dominant when proceeding to the LSMO layer.…”

Section: Resultsmentioning

confidence: 88%

Valence-band offset and forward-backward charge transfer in manganite/NiO and manganite/LaNiO₃heterostructures

et al. 2015

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The valence-band offset (VBO) of the La(0.67)Sr(0.33)MnO(3)/NiO (LSMO/NiO), LaMnO(3)/NiO (LMO/NiO), LSMO/LaNiO(3) (LSMO/LNO) and LMO/LaNiO(3) (LSMO/LNO) heterostructures has been investigated using X-ray photoemission spectroscopy. The VBO values are calculated to be -0.72, -0.05, +1.43 and +1.51 eV for the LSMO/NiO, LSMO/LNO, LMO/LNO and LMO/NiO heterostructures, respectively. Hence, when compared with NiO and LNO, the valence band of LSMO is shifted to a lower binding energy, whereas that of LMO is shifted to a higher binding energy. In addition, the charge transfer at the interfaces has been depicted as Mn(3.3+) + 0.7e→ Mn(2.6+), Mn(3.3+) + 0.1e→ Mn(3.2+), Mn(3.0+)- 0.4e→ Mn(3.4+) and Mn(3.0+)- 0.5e→ Mn(3.5+) for the LSMO/NiO, LSMO/LNO, LMO/LNO and LMO/NiO heterostructures, respectively. Thus, the charge transfer procedure can be described as electron hopping from NiO and LNO to LSMO in the LSMO/NiO and LSMO/LNO heterostructures, and electron hopping from LMO to NiO and LNO in the LMO/NiO and LSMO/LNO heterostructures. Therefore, the charge transfer is dependent on the VBO, and the charge transfer direction can be determined from the negative or positive values of the VBO.

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Section: Resultsmentioning

confidence: 88%

Valence-band offset and forward-backward charge transfer in manganite/NiO and manganite/LaNiO₃heterostructures

et al. 2015

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“…To ensure the quality of the peak fitting, all the core-level spectra were fitted with Gaussian-Lorentzian peaks and a combined Shirley background39. The Mn 3+ /Mn 4+ ratio in the LCMO can be deduced by the two fitted peaks for the Mn 2 p 3/2 peak40. The result shows that Mn 3+ is absolutely dominant in the LCMO layer, but there are small amount of Mn 4+ .…”

Section: Resultsmentioning

confidence: 99%

Fermi Level shifting, Charge Transfer and Induced Magnetic Coupling at La0.7Ca0.3MnO3/LaNiO3 Interface

Ning

Wang

Zhang

2015

Sci Rep

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A large magnetic coupling has been observed at the La0.7Ca0.3MnO3/LaNiO3 (LCMO/LNO) interface. The x-ray photoelectron spectroscopy (XPS) study results show that Fermi level continuously shifted across the LCMO/LNO interface in the interface region. In addition, the charge transfer between Mn and Ni ions of the type Mn3+ − Ni3+ → Mn4+ − Ni2+ with the oxygen vacancies are observed in the interface region. The intrinsic interfacial charge transfer can give rise to itinerant electrons, which results in a “shoulder feature” observed at the low binding energy in the Mn 2p core level spectra. Meanwhile, the orbital reconstruction can be mapped according to the Fermi level position and the charge transfer mode. It can be considered that the ferromagnetic interaction between Ni2+ and Mn4+ gives rise to magnetic regions that pin the ferromagnetic LCMO and cause magnetic coupling at the LCMO/LNO interface.

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“…4. 11,20,21 The shapes are apparently nearly similar. According to the relationship between ln q and the reciprocal of the absolute temperature (1/T), it reveals that the thermistor operate steadily with the linear dependence of resistivity versus temperature, indicative of the NTC thermistor characteristics.…”

Section: Electrical Propertiesmentioning

confidence: 86%

“…With respect to the XPS peaks of Mn 2p, although there are slight differences in the locations of binding energies of Mn 2p1/2 and Mn 2p3/2 among different samples, they are all still in good agreement with the values of Mn 3+ and Mn 4+ , which have a strong preference for octahedral sites. 11,20,21 The shapes are apparently nearly similar. However, a slight change in the peak position toward higher binding energy with the introduction of La 2 O 3 .…”

Section: Electrical Propertiesmentioning

confidence: 86%

Effect of La₂O₃ Addition on Copper‐Nickel Manganese Thermistors for Low‐Temperature Applications

Yao

Wang

Zhao

et al. 2013

Int J Applied Ceramic Tech

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The introduction of La2O3 to Mn0.75Ni1.25CuO4 ceramics was studied on the microstructure and electrical properties. The sintered Mn0.75Ni1.25CuO4‐xLa2O3 (0 ≤ x ≤ 0.3) bodies was typical polycrystalline, with cubic spinel structure of copper manganese oxide, rocksalt structure of nickel copper oxide, along with monoclinic phase of copper oxide and orthorhombic perovskite structure of lanthanum manganese oxide. It is found that La doping reduces the material grain size and changes its morphology from the plate‐like form to a spherical staking‐like form. The shape and size of the grains are strongly influenced by the addition of La to the system. The X‐ray photoelectron spectroscopy analysis corroborates the presence of nonequivalent ions at octahedral sites. The obtained ρ77K, B77K/90K constant and activation energy of the negative temperature coefficient (NTC) Mn0.75Ni1.25CuO4‐xLa2O3 thermistors were in the range of 13.19–30.39 Ω cm, 315–326 K, and 0.0272–0.0281 eV, respectively. This means that the electrical properties can be adjusted to desired values, depending on the La content. Such ceramics could be used as potential candidates for NTC thermistors in a temperature range from 20 K to 90K. So these prepared NTC thermistors were intended to be used under low‐temperature conditions.

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Chemical deposition of La0.7Ca0.3MnO3±δ films on ceramic substrates

Cited by 10 publications

References 27 publications

Valence-band offset and forward-backward charge transfer in manganite/NiO and manganite/LaNiO₃heterostructures

Valence-band offset and forward-backward charge transfer in manganite/NiO and manganite/LaNiO₃heterostructures

Fermi Level shifting, Charge Transfer and Induced Magnetic Coupling at La0.7Ca0.3MnO3/LaNiO3 Interface

Effect of La₂O₃ Addition on Copper‐Nickel Manganese Thermistors for Low‐Temperature Applications

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Chemical deposition of La0.7Ca0.3MnO3±δ films on ceramic substrates

Cited by 10 publications

References 27 publications

Valence-band offset and forward-backward charge transfer in manganite/NiO and manganite/LaNiO3heterostructures

Valence-band offset and forward-backward charge transfer in manganite/NiO and manganite/LaNiO3heterostructures

Fermi Level shifting, Charge Transfer and Induced Magnetic Coupling at La0.7Ca0.3MnO3/LaNiO3 Interface

Effect of La2O3 Addition on Copper‐Nickel Manganese Thermistors for Low‐Temperature Applications

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Valence-band offset and forward-backward charge transfer in manganite/NiO and manganite/LaNiO₃heterostructures

Valence-band offset and forward-backward charge transfer in manganite/NiO and manganite/LaNiO₃heterostructures

Effect of La₂O₃ Addition on Copper‐Nickel Manganese Thermistors for Low‐Temperature Applications