Study of lattice dynamics of bilayered tetragonal Ruddlesden-Popper compounds (Ca, Sr)3Mn2O7

Saini, Neetu; Jindal, Ruby; Tripathi, Archana

doi:10.1016/j.mtcomm.2022.105190

Cited by 8 publications

(4 citation statements)

References 34 publications

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“…The Raman and IR phonons of the bilayered tetragonal compounds Sr 3 B 2 O 7 (B = Zr, Mo, Sn, Hf) in the phase I4/mmm have been calculated by a study based on a comparison with the double‐layered tetragonal compounds Sr 3 Ti 2 O 7 , Sr 3 Mn 2 O 7 , and Sr 3 Fe 2 O 7 . The Sr 3 Ti 2 O 7 , Sr 3 Mn 2 O 7 , and Sr 3 Fe 2 O 7 compounds have similar structures, symmetries, and space groups with the studied compounds in the present work, so for comparative study, these compounds have been considered 21–28 . The Sr 3 Mn 2 O 7 compound in phase I4/mmm has been studied by Guedes et al 27 and in their work, the values of lower wavenumbers of A 1g modes are in the range of 243–170 cm − 1 , and for B 1g mode, it is 320 cm − 1 .…”

Section: Introductionmentioning

confidence: 59%

“…The Sr 3 Ti 2 O 7 , Sr 3 Mn 2 O 7 , and Sr 3 Fe 2 O 7 compounds have similar structures, symmetries, and space groups with the studied compounds in the present work, so for comparative study, these compounds have been considered. [21][22][23][24][25][26][27][28] The Sr 3 Mn 2 O 7 compound in phase I4/mmm has been studied by Guedes et al 27 and in their work, the values of lower wavenumbers of A 1g modes are in the range of 243-170 cm À1 , and for B 1g mode, it is 320 cm À1 . The lower wavenumbers of A 1g modes in our calculated results for the Raman modes for Sr 3 B 2 O 7 (B = Zr, Mo, Sn, Hf) compounds in the I4/mmm phase also fall in the same range.…”

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confidence: 99%

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Influence of B‐site cation in lattice dynamics of bilayered Ruddlesden–Popper Sr₃B₂O₇ (B = Zr, Mo, Sn, Hf) compounds

Saini

Jindal

Tripathi

2023

J Raman Spectroscopy

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The Raman and infrared (IR) wavenumbers for the Ruddlesden–Popper Srn + 1BnO3n + 1 (B = Zr, Mo, Sn, Hf) bilayered tetragonal compounds with n = 2 of symmetry D170.5em4h and phase I4/mmm (Z = 2) have been analyzed with Wilson's GF matrix method. Theoretical assignments for the optical wavenumbers have been reported for the first time for the bilayered tetragonal Sr3Zr2O7, Sr3Mo2O7, Sr3Sn2O7, and Sr3Hf2O7 compounds in phase I4/mmm with the use of 10 short‐range force constants. Using the available data of the isostructural compounds Sr3Ti2O7, Sr3Mn2O7, and Sr3Fe2O7, we have tried to calculate the vibrational modes of the Sr3B2O7 (B = Zr, Mo, Sn, Hf) compounds in phase I4/mmm by the comparative method. Also, we have compared all these Sr3B2O7 (B = Zr, Mo, Sn, Hf) compounds together in terms of wavenumbers and force constants. The appropriate optical vibrational modes have been assigned to the bilayered tetragonal Sr3B2O7 (B = Zr, Mo, Sn, Hf) compounds in phase I4/mmm. The impact of cation‐B (B = Zr, Mo, Sn, Hf) exchange on the lattice dynamics of the tetragonal bilayered Sr3B2O7 (B = Zr, Mo, Sn, Hf) isostructural compounds has been analyzed by comparison of the zone center vibrational modes, force constants, and bond lengths. To understand the structure more clearly, an attempt is also made to analyze the effect of B‐cations on the affected apical bonds. It was observed that the B‐site substitutions have the least influence on the Sr layer and the equatorial bonds of octahedra; meanwhile, the outer apical bonds of the octahedra have shown the maximum impact. For each normal mode of the bilayered tetragonal Sr3B2O7 (B = Zr, Mo, Sn, Hf) Ruddlesden–Popper phase, the potential energy distribution (PED) has been analyzed for the noteworthy effects of short‐range force constants on calculated wavenumbers.

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Section: Introductionmentioning

confidence: 59%

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confidence: 99%

Influence of B‐site cation in lattice dynamics of bilayered Ruddlesden–Popper Sr₃B₂O₇ (B = Zr, Mo, Sn, Hf) compounds

Saini

Jindal

Tripathi

2023

J Raman Spectroscopy

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“…The XRD profiles of the Nb doped series are shown in Figure 1a-d; all compounds possess Ruddlesden-Popper tetragonal phase with an I4/mmm space group symmetry [25,26]. The Rietveld refinement of XRD profiles revealed that with respect to the Nb concentration the unit cell constants (a, b) increased from 3.86357 Å for x = 0.0 up to 3.87041 Å for the highest Nb concentration, which indicates an expansion in interplanar spacing and unit cell volume as is also evident from Table 1.…”

Section: Resultsmentioning

confidence: 99%

Evidence of a Large Refrigerant Capacity in Nb-Modified La1.4Sr1.6Mn2−xNbxO7 (0.0 ≤ x ≤ 0.15) Layered Perovskites

Kumar,

Kim,

Sharma

et al. 2024

Magnetochemistry

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In this work, evidence of isothermal magnetic entropy change (∆SM) over a broad temperature region is presented in a series of La1.4Sr1.6Mn2−xNbxO7 Ruddlesden–Popper compounds with niobium modification (Nb) (0.0 ≤ x ≤ 0.15) at the manganese (Mn) site. The ceramic samples were obtained through a solid-state sintering method in optimized conditions. All compounds predominantly possessed Ruddlesden–Popper phase while a few additional reflections were resolved in Nb-doped compounds which indicates the separation of structural phases. These peaks are assigned to a separate layered perovskite and single perovskite with tetragonal symmetry and hexagonal symmetry, respectively. The microstructure of the pure sample reveals uniform grain morphology but in Nb-doped specimens chiefly three types of grains were found. It was assumed that the inter-connected large particles were of R-P phase which is dominant in both parent and x = 0.05 compounds, while the hexagonal and polygonal morphology of grains in higher concentrations of dopants directly corroborates with the symmetry of single perovskite and additional layered perovskite phases, respectively. The parent compound exhibits a single ∆SM curve, whereas all Nb-substituted samples display bifurcated ∆SM curves. This indicated two transition regions with multiple magnetic components, attributed to distinct structural phases. The highest ∆SM values obtained for components corresponding to the R-P phase are 2.32 Jkg−1k−1, 0.75 Jkg−1k−1, 0.58 Jkg−1k−1 and 0.43 Jkg−1k−1 and for the second component located around room temperature are 0.0 Jkg−1k−1, 0.2 Jkg−1k−1, 0.28 Jkg−1k−1 and 0.35 Jkg−1k−1 for x = 0.0, 0.05, 0.10 and 0.15 compositions, respectively, at 2.5 T. Due to the collective participation of both components the ∆SM was expanded through a broad temperature range upon Nb doping.

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“…In most single-phase multiferroics, the magnetoelectric (ME) coupling between electrical and magnetic ordering is generally weak and operates at very low temperatures, making it difficult to use in practical applications [ 4 , 5 , 6 ]. For example, some compounds based on the Bi 2 LaNb 1.5 Mn 0.5 O 9 Aurivillius phase [ 7 ], the Ba 4 (Sm x La 1− x ) 2 Fe 2 Nb 8 O 30 tungsten bronze phase [ 8 ] or the (Ca,Sr) 3 Mn 2 O 7 Ruddlesden-Popper perovskites [ 9 , 10 ] show low magnetoelectric coupling properties even at low temperatures. On the other hand, although single-phase BiFeO 3 ceramics are magnetoelectric at room temperature, it is difficult to obtain single-phase ceramics with acceptable properties.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the Synthesis Method and the Magnetoelectric Properties of Bismuth Sodium-Potassium Titanate/Nickel Cobalt Ferrite Lead-Free Composites

2023

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In this work, the influence of the synthesis methods of piezoelectric and magnetostrictive phases on the final properties of the Bi0.5(Na0.8K0.2)0.5TiO3-Ni0.5Co0.5Fe2O4 composites was studied. Different routes were used to individually synthesize each phase, and the composites were prepared using different fractions for each phase. Composites were sintered, and the structural, microstructural, dielectric, and magnetoelectric properties were evaluated. According to the selected synthesis method employed for each phase, different particle sizes and reactivities of the individual phases were obtained. These differences determined the suitable sintering temperature for each set of composites and were responsible for the final properties. In fact, magnetoelectric properties were modulated by the combination of composition and synthesis routes.

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Study of lattice dynamics of bilayered tetragonal Ruddlesden-Popper compounds (Ca, Sr)3Mn2O7

Cited by 8 publications

References 34 publications

Influence of B‐site cation in lattice dynamics of bilayered Ruddlesden–Popper Sr₃B₂O₇ (B = Zr, Mo, Sn, Hf) compounds

Influence of B‐site cation in lattice dynamics of bilayered Ruddlesden–Popper Sr₃B₂O₇ (B = Zr, Mo, Sn, Hf) compounds

Evidence of a Large Refrigerant Capacity in Nb-Modified La1.4Sr1.6Mn2−xNbxO7 (0.0 ≤ x ≤ 0.15) Layered Perovskites

Relationship between the Synthesis Method and the Magnetoelectric Properties of Bismuth Sodium-Potassium Titanate/Nickel Cobalt Ferrite Lead-Free Composites

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Study of lattice dynamics of bilayered tetragonal Ruddlesden-Popper compounds (Ca, Sr)3Mn2O7

Cited by 8 publications

References 34 publications

Influence of B‐site cation in lattice dynamics of bilayered Ruddlesden–Popper Sr3B2O7 (B = Zr, Mo, Sn, Hf) compounds

Influence of B‐site cation in lattice dynamics of bilayered Ruddlesden–Popper Sr3B2O7 (B = Zr, Mo, Sn, Hf) compounds

Evidence of a Large Refrigerant Capacity in Nb-Modified La1.4Sr1.6Mn2−xNbxO7 (0.0 ≤ x ≤ 0.15) Layered Perovskites

Relationship between the Synthesis Method and the Magnetoelectric Properties of Bismuth Sodium-Potassium Titanate/Nickel Cobalt Ferrite Lead-Free Composites

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Influence of B‐site cation in lattice dynamics of bilayered Ruddlesden–Popper Sr₃B₂O₇ (B = Zr, Mo, Sn, Hf) compounds

Influence of B‐site cation in lattice dynamics of bilayered Ruddlesden–Popper Sr₃B₂O₇ (B = Zr, Mo, Sn, Hf) compounds