Thermal stability and decomposition kinetics of NdNiO3−δ at 1 bar of O2

Bassou, A.A.; Machado, P.; Gomes, Mariana; Manjunath, B.C.; Vilarinho, R.; Silva, B.; Oliveira, José de; Almeida, Bernardo Pinto de; Almeida, Alfredo M. Ozorio de; Fernandes, José R.; Fernandes, Lisete; Moreira, J. Agostinho; Tavares, Pedro B.

doi:10.1016/j.mtcomm.2021.102663

Cited by 3 publications

(5 citation statements)

References 24 publications

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“…The unpolarized Raman spectra of the studied samples in the range 220 -340 cm -1 , recorded at different representative temperatures, are presented in Figure 3, along with the results of the spectral deconvolution (Figure S8 of Supplemental Information shows the overall set of results obtained in this work, while Figure S9 shows a comparison between the Raman signature of the NNO samples and LAO substrate, at room conditions). The room temperature Raman signature of all samples exhibit the typical spectral profile consistent with the Pnma symmetry for NNO, as reported elsewhere [11,22]. The results confirm the good structural quality of the sample, with the 110 nm film exhibiting the best one, ascertained by the narrower and thus better resolved Raman bands.…”

Section: Structural Phase Coexistence and Correlation With Mitsupporting

confidence: 86%

“…The detailed preparation methods and characterization of the NdNiO3 ceramic can be found in Ref. [22]. Thin films of NdNiO3 were deposited into (001)-oriented LaAlO3 substrates by metal organic chemical vapor deposition (MOCVD), described in Supplemental Information and in…”

Section: Methodsmentioning

confidence: 99%

“…Values presented for ceramic sample were taken from the analysis presented in Ref. [22] and Supplemental Information, for the films.…”

Section: Morphological Chemical and Structural Characterizationmentioning

confidence: 99%

“…Ceramic [22] 174 ± 22 (grain size) Information). From the same figures, the higher epitaxy of the 110 nm film is ascertained.…”

Section: Nno Sample Thickness (Nm) Lattice Parameter B (å) δmentioning

confidence: 99%

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The role of structural distortions in triggering the metal to insulator transition in NdNiO3

Gomes¹,

Balagopalan²,

Vilarinho³

et al. 2023

Preprint

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The role of the structural distortions on the metal to insulator transition (MIT) of NdNiO3 is still a controversial topic. NdNiO3 ceramic, 260 nm and 110 nm thin films deposited onto (001)-oriented LaAlO3 substrates were studied to unravel the effect of structural symmetry breaking on the electronic phase transition. Resistivity measurements evidence the coexistence of metallic and insulating states below the TMI, while magnetization measurements confirm the expected TMI = TN for all samples. The structural symmetry was investigated across the MIT, through Raman scattering spectroscopy, with the orthorhombic Pnma phase being found at high temperatures, but the emergence of the monoclinic P21/n phase only occurring well below TMI, which is an unexpected experimental result since the structural transition has been understood as a necessary trigger for the MIT. These experimental results, which are noticeably independent of the sample type/quality, imply a temperature difference between the structural and electronic/magnetic ordering, thus contrasting with current theoretical models.

show abstract

Section: Structural Phase Coexistence and Correlation With Mitsupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

“…Values presented for ceramic sample were taken from the analysis presented in Ref. [22] and Supplemental Information, for the films.…”

Section: Morphological Chemical and Structural Characterizationmentioning

confidence: 99%

“…Ceramic [22] 174 ± 22 (grain size) Information). From the same figures, the higher epitaxy of the 110 nm film is ascertained.…”

Section: Nno Sample Thickness (Nm) Lattice Parameter B (å) δmentioning

confidence: 99%

See 2 more Smart Citations

The role of structural distortions in triggering the metal to insulator transition in NdNiO3

Gomes¹,

Balagopalan²,

Vilarinho³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Only one work reports on the occurrence of this transition in PrNiO 3 at 773 K . This rhombohedral phase is reported at 1193 K for NdNiO 3 , as obtained from differential thermal analyses, , showing the R cation size effects on the transition onset temperature. We used the multiscale information gained in this work as presented in Figure e–h to track the evolution of the structural and electronic properties across such a transition.…”

Section: Discussionmentioning

confidence: 99%

Mapping Pressure- and Temperature-Induced Structural and Magnetic Transitions in Perovskite PrNiO₃ with Local and Long-Range Probes

Rodrigues,

Rosa,

Gainza

et al. 2023

Chem. Mater.

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The RNiO 3 nickelate perovskites represent a promising class of materials for spintronics applications such as in modern communication devices. This is related to the large diversity of properties shown by these compounds. Indeed, depending on the external parameters, such as temperature, pressure, or R cation size, they can exhibit para-or antiferromagnetic behavior and can transform from an insulator to a metal. Among them, PrNiO 3 is one of the most important members because it exhibits tunable electronic and magnetic properties. However, our understanding of how these properties can be modified through external parameters, such as pressure and temperature, remains under debate. In this work, we characterized the structural, electronic, and magnetic properties of PrNiO 3 in the range of 0−21 GPa and 10−973 K. For this purpose, we performed synchrotron X-ray diffraction (SXRD), X-ray absorption nearedge structure spectroscopy (XANES), and magnetic measurements. We compared the experimental XANES data with ab initio calculations to extract information about the electronic structure. The diffraction data demonstrated a sharp transition at the bulk level between monoclinic and orthorhombic PrNiO 3 (P2 1 /n → Pbnm) at T IM ∼ 130 K, while XANES data, which probe the medium-range and electronic structure, showed progressive changes between 90 and 130 K. The latter is in accordance with our previous EXAFS data, attesting that this transition occurs around 130 K and that it is driven at the local and medium-range scales. Between 700 and 800 K at ambient pressure, the Pbnm phase transforms into a rhombohedral phase (R3̅ c), in agreement with a previous laboratory X-ray diffraction study. Our XANES data and ab initio simulations across this transition indicate a significant raising of the orbital overlap between Ni 3d and O 2p, suggesting superior electronic properties of the rhombohedral phase compared to the orthorhombic structure. Under isothermal cold compression, we found that the Pbnm to R3̅ c transition is characterized by a large coexisting domain between 5.8 and 12.2 GPa. Based on the present and literature data, we proposed an extended pressure-and temperature-phase diagram of PrNiO 3 and provided first-order constraints on the interplay between external parameters and properties in nickelates.

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Structural percolation evolution throughout the metal-to-insulator transition in NdNiO3

Gomes,

Manjunath,

Vilarinho

et al. 2024

Phys. Rev. B

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Thermal stability and decomposition kinetics of NdNiO3−δ at 1 bar of O2

Cited by 3 publications

References 24 publications

The role of structural distortions in triggering the metal to insulator transition in NdNiO3

The role of structural distortions in triggering the metal to insulator transition in NdNiO3

Mapping Pressure- and Temperature-Induced Structural and Magnetic Transitions in Perovskite PrNiO₃ with Local and Long-Range Probes

Structural percolation evolution throughout the metal-to-insulator transition in NdNiO3

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Thermal stability and decomposition kinetics of NdNiO3−δ at 1 bar of O2

Cited by 3 publications

References 24 publications

The role of structural distortions in triggering the metal to insulator transition in NdNiO3

The role of structural distortions in triggering the metal to insulator transition in NdNiO3

Mapping Pressure- and Temperature-Induced Structural and Magnetic Transitions in Perovskite PrNiO3 with Local and Long-Range Probes

Structural percolation evolution throughout the metal-to-insulator transition in NdNiO3

Contact Info

Product

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Mapping Pressure- and Temperature-Induced Structural and Magnetic Transitions in Perovskite PrNiO₃ with Local and Long-Range Probes