Transition and transport behavior in spinel oxide MgTi2O4 and its La-doped counterparts

Zhu, Yuanyuan; Wang, Rongjuan; Wang, Li; Liu, Yong; Xiong, Rui; Shi, Jing; Tian, Mingliang

doi:10.1016/j.jallcom.2016.01.062

Cited by 6 publications

(2 citation statements)

References 21 publications

(16 reference statements)

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“…Aside from that, the interchange of Crsites and Ni-sites may have a small part in the studied phenomena. 24,25 Moreover, XRD peaks I = intensities of the (I/311)) and (I/220) hkl planes are more searching to the cations on the octahedral and tetrahedral, respectively. Absolutely, La dopant effecting that the Ni 2+ and Cr 3+ ions have an effective incorporated La to occupied A and B sites, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of La Doping on NiCr₂O₄ Properties and Catalytic Applications toward Decolorization of 4-Nitrophenol

Rajeswari¹,

Prabavathi²,

Prakasam³

et al. 2022

ECS J. Solid State Sci. Technol.

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We report the successful synthesis of urea as a fuel for low-temperature microwave combustion-based synthesis of NiCr2O4 and La-doped NiCr2O4. Synthesis parameters include the kind of precursor, fuel, and container, as well as how external heat is provided to achieve the combustion reaction. Crystal structures, morphology, surface area, solar cells, Fourier-transform infrared spectrometry, and catalytic activity were used to characterize the products. No impurities phase formed in the as-synthesized NiCr2O4 sample, confirmed by XRD. Surface area was measured with a Brunauer–Emmet–Teller adsorption isotherm. Schottky and Frenkel formation energies have been investigated. This demonstrates the time needed for full decolorization of 4-Nitrophenol (yellow color) by NiCr2O4 and La-doped NiCr2O4. The La-doped NiCr2O4 (0.03%) showed the greatest catalytic activity compared to pristine and other La-doped NiCr2O4. The decolorization occurs in 10 min. The chemical hardness and surface area of the chromites appear to be important in determining catalytic performance. For multi oxide systems, the counter-doped ions in the A and B sites may alter the metal ion-oxide bond, promoting this partial oxidation process at the interface. The results suggest multiple research subjects focusing on such materials for the future.

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Section: Resultsmentioning

confidence: 99%

Effect of La Doping on NiCr₂O₄ Properties and Catalytic Applications toward Decolorization of 4-Nitrophenol

Rajeswari¹,

Prabavathi²,

Prakasam³

et al. 2022

ECS J. Solid State Sci. Technol.

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“…approximate ionic radius between Mg 2+ and Li + , one would expect that the MTO might also show superconductivity. Considerable efforts have been made in past several decades, for instance, adjusting the Mg/Ti ratio or substituting Mg by La [23][24][25][26]. However, it has not been successful in turning MTO into a superconductor.…”

mentioning

confidence: 99%

Emergent superconductivity in single crystalline $\mathrm{MgTi}_2\mathrm{O}_4$ films via structural engineering

Hu,

Feng,

Gong

et al. 2019

Preprint

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Spinel compounds have demonstrated rich functionalities but rarely shown superconductivity. Here, we report the emergence of superconductivity in the spinel MgTi 2 O 4 , known to be an insulator with a complicated order. The superconducting transition is achieved by engineering a superlattice of MgTi 2 O 4 and SrTiO 3 . The onset transition temperature in the MgTi 2 O 4 layer can be tuned from 0 to 5 K in such geometry, concurrently with a stretched c-axis (from 8.51 to 8.53 Å) compared to the bulk material. Such a positive correlation without saturation suggests ample room for the further enhancement. Intriguingly, the superlattice exhibits isotropic upper critical field H c2 that breaks the Pauli limit, distinct from the highly anisotropic feature of interface superconductivity. The origin of superconductivity in the MgTi 2 O 4 layer is understood in combination with the electron energy loss spectra and the first-principles electronic structure calculations, which point to the birth of superconductivity in the MgTi 2 O 4 layer by preventing the Ti-Ti dimerization. Our discovery not only provides a platform to explore the interplay between the superconductivity and other exotic states, but also opens a new window to realize superconductivity in the spinel compounds as well as other titanium oxides.

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Study the relation between band gap value and lattice constant of MgTi2O4

Shi

Lian

et al. 2019

Journal of Alloys and Compounds

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Transition and transport behavior in spinel oxide MgTi2O4 and its La-doped counterparts

Cited by 6 publications

References 21 publications

Effect of La Doping on NiCr₂O₄ Properties and Catalytic Applications toward Decolorization of 4-Nitrophenol

Effect of La Doping on NiCr₂O₄ Properties and Catalytic Applications toward Decolorization of 4-Nitrophenol

Emergent superconductivity in single crystalline $\mathrm{MgTi}_2\mathrm{O}_4$ films via structural engineering

Study the relation between band gap value and lattice constant of MgTi2O4

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Transition and transport behavior in spinel oxide MgTi2O4 and its La-doped counterparts

Cited by 6 publications

References 21 publications

Effect of La Doping on NiCr2O4 Properties and Catalytic Applications toward Decolorization of 4-Nitrophenol

Effect of La Doping on NiCr2O4 Properties and Catalytic Applications toward Decolorization of 4-Nitrophenol

Emergent superconductivity in single crystalline $\mathrm{MgTi}_2\mathrm{O}_4$ films via structural engineering

Study the relation between band gap value and lattice constant of MgTi2O4

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Product

Resources

About

Effect of La Doping on NiCr₂O₄ Properties and Catalytic Applications toward Decolorization of 4-Nitrophenol

Effect of La Doping on NiCr₂O₄ Properties and Catalytic Applications toward Decolorization of 4-Nitrophenol