Cation size mismatch effect in (La1-yREy)1.4Ca1.6Mn2O7 perovskite manganites

Koc, N. Soylu; Altintas, S.P.; Mahamdioua, N.; Terzioğlu, C.

doi:10.1016/j.jallcom.2019.05.079

Cited by 20 publications

(10 citation statements)

References 45 publications

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“…The sample contains nonhomogeneous grains with irregular shape. Similar finding is reported that the irregular grains contribute to lattice strain, which randomly displaces oxygen ions [22]. This distortion of MnO6 octahedra leads to the localisation of electrons.…”

Section: Morphology (Microstructural Analysis)supporting

confidence: 86%

“…This distortion of MnO6 octahedra leads to the localisation of electrons. In fact, a significant defect in the A-site cations results in a random arrangement of the Mn 3+ and Mn 4+ ions [22,23]. According to the morphology, the average diameter of Pr0.67Ba0.33MnO3 is 2.312 μm by using the scale of 20 μm in Figure 4.…”

Section: Morphology (Microstructural Analysis)mentioning

confidence: 98%

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Structural and Morphology Changes in PrMnO3 Manganite Induced by Ba (x=0.33) Doping

Amaran

Ibrahim

Mohamed

2023

ARASET

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In this paper, we discuss the structural and morphology properties of the solid-state prepared Pr0.67Ba0.33MnO3 perovskite manganite X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analyses were utilised to examine the structure, morphology, and chemical composition. The compound exhibits a single phase with an orthorhombic perovskite structure with a Pnma space group without any impurities. The refined cell parameters are a = 5.504 Å, b = 7.778 Å, and c = 5.528 Å (α = β = γ = 90° and a ≠ b ≠ c), therefore the cell volume is 236.723 Å^3. The tolerance factor is used to predict the stability of the Pr0.67Ba0.33MnO3, which is τ = 0.9241. Fourier transform infrared spectroscopy (FTIR) reveals that the Mn-O bonds appear at 600 cm^(-1). In addition, morphology SEM revealed that the grain sizes are heterogeneous, and the grain shapes are irregular. Using EDX technique, the percentage elemental composition of Pr, Ba, Mn, and O was determined. The values of the atomic percentages for each element are almost identical to the ratios of the elements during sample preparation.

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Section: Morphology (Microstructural Analysis)supporting

confidence: 86%

Section: Morphology (Microstructural Analysis)mentioning

confidence: 98%

Structural and Morphology Changes in PrMnO3 Manganite Induced by Ba (x=0.33) Doping

Amaran

Ibrahim

Mohamed

2023

ARASET

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“…In fact, N. Soylu Koc et al [16] reported that the decrease in the ² values is associated with a reduction in the T MI and the T c in the (La…”

Section: Structural Propertiesmentioning

confidence: 99%

“…By adding an alkali or alkali-earth element to the La site, compounds with the formula La 2−2x 3+ Ca 1−x +2 Mn 2−2x 3+ Mn 2x 4+ O 7 2− can be produced to achieve this hole doping [13]. The introduction of such elements may lead to considerable changes in the structure, in the average Asite ionic radius 〈𝑟 𝐴 〉, in Mn -O bond distance, in Mn -O -Mn bond angle, in tolerance factor, in the Jahn-Teller distortion, in the cation size mismatch 𝜎 2 , in the bandwidth W, and in the Mn 3+ Mn 4+ ⁄ ratio, which are, with the oxygen stoichiometry, the main factors affecting the electrical, magnetotransport and magnetic properties of the manganite-type materials [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

On the magnetotransport properties and Griffith phase in (La,Gd)1.4 (Ca,Sr)1.6 Mn2 O7 the double layered manganites

Belguet

Mahamdioua

Meriche

et al. 2023

Preprint

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The bilayered manganite with formula \({ \text{L}\text{a}}_{1.2}{\text{G}\text{d}}_{0.2}{\text{C}\text{a}}_{1.2}{\text{S}\text{r}}_{0.4}{\text{M}\text{n}}_{2}{\text{O}}_{7}\)has been synthesized by the solid state reaction route with the aim of studying its structural, microstructural, magnetic, electrical and magnetotransport properties. The X-ray diffraction patterns have been analyzed by Rietveld refinement. It revealed that the sample crystallized in a tetragonal structure with the space group I4/mmm and that, as an impurity phase, there were traces of an orthorhombic structure corresponding to a simple perovskite with the space group Pnma. The morphology was examined by using scanning electron microscopy, which revealed that it was porous and granular. The presence and purity of all the constituent elements were confirmed by the Energy Dispersive X-ray spectroscopy investigation. Based on magnetization, the inverse of susceptibility, and hysteresis loop, the magnetic behavior of the compound is discussed in detail. The sample displays a phase transition from ferromagnetic (FM) to paramagnetic (PM) at \({\text{T}}_{\text{C}}\), which was determined to be 290.13 K. Between 305 and 360 K, a Griffith phase (GP) was discovered, indicating the existence ofFM clusters in the paramagnetic domains, and the Griffithtemperature was found to be\(\)339 K. The sample can be thought of as spin-glass-like manganite since a significant divergence wasobserved at low temperatures between the magnetization curves M (T) in the zero-field cooling (ZFC) and field cooling (FC) modes. The spin-glass transition temperature was found to be 261 K. The electrical resistivity under both 0 and 1 T magnetic field exhibits metal-to-insulator transition at \({\text{T}}_{\text{M}\text{I}}\) = 152.98 K. The magnetoresistance was observed to decrease with increasing temperature, peaking at 23% at 11 K under 1 T. Total resistivity in magnetic applied fields of 0T and 1T is composed of residual resistivity, weak localization, and electron-electron combinations below \({\text{T}}_{\text{M}\text{I}}\). Above\({\text{T}}_{\text{M}\text{I}}\) and\({{\theta }}_{\text{D}}/2\) (\({{\theta }}_{\text{D}}\)is Debye temperature), the Mott’s 3D variable range hopping mechanism (3D-VRH) governed the electrical conduction, whereas, the adiabatic small polaron hopping model governed it in the range\({{\theta }}_{\text{D}}/2>\text{T}>300\text{K}\). The density of states, mean hopping energy, and mean hopping distance have all been estimated and thoroughly discussed.

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“…However, the mismatch of radii between the cations and the anion could either realign the position of B‐site cation away from the center position or tilt the octahedral cage at an angle. [ 57–59 ] This misalignment of cation B or tilting of the octahedral cage could account for the origin of optoelectronic properties in halide perovskite. [ 60–62 ] Nevertheless, tremendous amount of research and development efforts have led to the skyrocketing efficiency of PSCs over a short timespan, compared with other PVs, as shown in Figure 2b.…”

Section: A Brief Overview Of Pscsmentioning

confidence: 99%

A Perspective on the Commercial Viability of Perovskite Solar Cells

et al. 2021

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Perovskite solar cells (PSCs) have received a large amount of research funds due to their potential as a frontrunner in a new generation of solar cells; consequently, the desire to commercialize this technology is mounting. In this roadmap, the knowledge and the technological gaps between laboratory and industry are critically analyzed from the perspective of 5S criteria (Stability, Safety, Sustainability, Scalability, and Storage). To avoid any favoritism in the arguments toward commercializing this technology, herein, the average parameters of PSCs (photoconversion efficiency, durability, cost, manufacturability, and sustainability) estimated from previous studies are analyzed and discussed. Unique opportunities for PSCs in their current stage of achievements are identified, where application‐driven, instead of performance‐driven, developments are shown to favor their commercialization. Efforts required to improve the average performance of PSCs to state‐of‐the‐art levels are also identified and discussed.

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Cation size mismatch effect in (La1-yREy)1.4Ca1.6Mn2O7 perovskite manganites

Cited by 20 publications

References 45 publications

Structural and Morphology Changes in PrMnO3 Manganite Induced by Ba (x=0.33) Doping

Structural and Morphology Changes in PrMnO3 Manganite Induced by Ba (x=0.33) Doping

On the magnetotransport properties and Griffith phase in (La,Gd)1.4 (Ca,Sr)1.6 Mn2 O7 the double layered manganites

A Perspective on the Commercial Viability of Perovskite Solar Cells

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