Crystallite size strain analysis of nanocrystalline La0.7Sr0.3MnO3 perovskite by Williamson-Hall plot method

Kumar, Dinesh; Verma, N. K.; Singh, Chandra Bhal; Singh, Akhilesh Kumar

doi:10.1063/1.5028655

Cited by 17 publications

(7 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structural data obtained from the refinement is given in table 1. The values of lattice parameters corresponding to each phase are found to be in good agreement with the earlier reported data in literature [66][67][68].…”

Section: Resultssupporting

confidence: 90%

Enhancement in thermoelectric properties of n-type (La_0.7Sr_0.3MnO₃)_0.5.(NiO)_0.5: composite and nano-structure effect

Singh¹,

Srivastav²,

Patel³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

In the enhancement of thermoelectric properties of material for energy harvesting applications, the role of nano-composite made of two different materials plays a very crucial role. When materials with different crystal and electronic structure are synthesized in nano-crystalline phase to form a composite, they provide large power factor via energy filtering effect, whereas the lattice mismatching and grain boundaries of two phase scatter the phonons having wide range of frequencies, and effectively maintain the low thermal conductivity. In the present work, we have reported the structural and thermoelectric properties of (La0.7Sr0.3MnO3)0.5(NiO)0.5 composite synthesized by sol-gel method. Rietveld refinement of the XRD pattern confirms the presence of both phases. Thermoelectric properties are measured in 300–600 K temperature range. The magnitude of Seebeck coefficients, electrical resistivity, and thermal conductivity found to be monotonically increase with temperature upto the ∼450 K, which decrease gradually with further increase in temperature. Such variation in transport properties are resulted from the combine effect from the composite materials formed with semiconducting/metallic, and insulating electronic structure mixed in a 50:50 weight ratio. The calculated ‘figure-of-merit’ (ZT) shows an increasing trend with temperature. The value of ZT max is found to be ∼0.05 at 600 K, which is nearly three times larger than that of La0.7Sr0.3MnO3 (ZT = 0.013) reported earlier. Our strategy of making nano-composite two materials with different electronic structures enhanced the ZT by ∼285%. The improvement in thermoelectric properties of n-type oxide materials can be useful to consider this material for applications in mid-temperature range.

show abstract

Section: Resultssupporting

confidence: 90%

Enhancement in thermoelectric properties of n-type (La_0.7Sr_0.3MnO₃)_0.5.(NiO)_0.5: composite and nano-structure effect

Singh¹,

Srivastav²,

Patel³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The effects of size and microstrain are analyzed in these lead-free perovskites using Williamson–Hall analysis of the XRD spectra (Figure S1, Supporting Information). − We quantify the extent of microstrain and the crystallite size in our lead-free ABI perovskite films by analyzing the peak broadening in the diffraction patterns according to the Williamson–Hall method (Table S2). We observed that MBI films have larger crystallite sizes in comparison to the FBI and CBI films.…”

Section: Resultsmentioning

confidence: 99%

Cation-Dependent Hot Carrier Cooling in the Lead-Free Bismuth Halide A₃Bi₂I₉ (A = FA, MA, and Cs) Perovskite

et al. 2021

View full text Add to dashboard Cite

Lead-free halide perovskites, as environment-friendly materials, have received critical interest in photovoltaic applications. In this regard, the bismuth halide perovskites demonstrate better stability under ambient conditions than lead halide perovskites and consequently remain one of the critical areas for the development of lead-free absorber materials. The steady-state optical properties are widely investigated in these bismuth halide perovskites, but excited-state charge carrier dynamics such as hot carrier relaxation remain elusive. However, it is crucial to investigate the rapid relaxation of above band gap “hot” carriers as it restricts the fundamental efficiency limit in the perovskite solar cells. Here, we demonstrate the cation-dependent hot carrier cooling in the lead-free A3Bi2I9 [A = FA (formamidinium), MA (methylammonium), and Cs (cesium)] perovskite by using femtosecond transient absorption spectroscopy. These lead-free perovskites were fabricated from gamma-butyrolactone (γ-GBL) solvent to ensure uniformity and continuity of the as-grown film and were well characterized by XRD, SEM, and steady-state absorption and photoluminescence spectroscopy. With varying A-cations, we observe that the hot-hole relaxation is slowest in the all-inorganic perovskite Cs3Bi2I9 (12.83 ps) and hot electron relaxation is slowest in the hybrid MA3Bi2I9 perovskite (6.42 ps) at the same excitation energy. The observed strong dependence of carrier cooling on cation composition is explained by the interaction between the different organic cations (A = FA, MA, and Cs) with the Pb–Br frameworks. Our study provides an opportunity to understand the effect of cations on the excited-state carrier dynamics, especially the hot carrier relaxation in the bismuth halide perovskites. This will pave the way for designing hot carrier-based high-efficient lead-free perovskite photovoltaic devices.

show abstract

“…Let us describe the process of synthesis of the perovskite materials using auto-combustion method (see Figure 4(a)) with the help of an example were dissolved in diluted nitric acid to prepare their respective nitrates and then Mn(CH 3 COO) 2 .4H 2 O and glycine were dissolved into distilled water. All the prepared precursor solutions of the materials were dissolved/prepared independently and at the end, they were mixed simultaneously under nonstop stirring in a large beaker and heated on a magnetic stirrer at 175-200°C [31]. After continuous stirring of 6-7 h, the mixed solution became thicker and converted into gel, with further increase in time of stirring, an auto-ignition takes place resulting in flame that evolves huge amount of different gases.…”

Section: Auto-combustion Methodsmentioning

confidence: 99%

Synthesis Techniques and Applications of Perovskite Materials

Kumar¹,

Yadav²,

Monika³

et al. 2020

Perovskite Materials, Devices and Integration

Self Cite

View full text Add to dashboard Cite

Perovskite material is a material with chemical formula ABX 3 -type, which exhibits a similar crystal structure of CaTiO 3 . In this material, A and B are metal cations with ionic valences combined to +6, e.g., Li + :Nb 5+ ; Ba 2+ :Ti 4+ ; Sr 2+ :Mn 4+ ; La 3+ :Fe 3+ , and X is an electronegative anion with ionic valence (−2), such as O 2− , S 2− , etc. The properties of a perovskite material strongly depend on the synthesis route of materials. The perovskite materials may be oxides (ABO 3 :CaMnO 3 ), halides (ABX 3 : X = Cl, Br, I), nitrides (ABN 3 :CaMoN 3 ), sulfides (ABS 3 :LaYS 3 ), etc., and they may exist in different forms, such as powders, thin films, etc. There are various routes for the synthesis of several perovskites, such as solid-state synthesis, liquid-state synthesis, gas-state synthesis, etc. In this chapter, we discuss various techniques for the synthesis of oxide perovskites in powder form using solid-, liquid-, and gas-state synthesis methods, and we also present an overview on the other type of perovskite materials. The X-ray diffraction, scanning electron microscopy, and optical techniques are used to study the purity of crystallographic phase, morphology, and photoluminescence properties of the perovskite materials. Some applications of different perovskite materials are also discussed.

show abstract

Crystallite size strain analysis of nanocrystalline La0.7Sr0.3MnO3 perovskite by Williamson-Hall plot method

Cited by 17 publications

References 9 publications

Enhancement in thermoelectric properties of n-type (La_0.7Sr_0.3MnO₃)_0.5.(NiO)_0.5: composite and nano-structure effect

Enhancement in thermoelectric properties of n-type (La_0.7Sr_0.3MnO₃)_0.5.(NiO)_0.5: composite and nano-structure effect

Cation-Dependent Hot Carrier Cooling in the Lead-Free Bismuth Halide A₃Bi₂I₉ (A = FA, MA, and Cs) Perovskite

Synthesis Techniques and Applications of Perovskite Materials

Contact Info

Product

Resources

About

Crystallite size strain analysis of nanocrystalline La0.7Sr0.3MnO3 perovskite by Williamson-Hall plot method

Cited by 17 publications

References 9 publications

Enhancement in thermoelectric properties of n-type (La0.7Sr0.3MnO3)0.5.(NiO)0.5: composite and nano-structure effect

Enhancement in thermoelectric properties of n-type (La0.7Sr0.3MnO3)0.5.(NiO)0.5: composite and nano-structure effect

Cation-Dependent Hot Carrier Cooling in the Lead-Free Bismuth Halide A3Bi2I9 (A = FA, MA, and Cs) Perovskite

Synthesis Techniques and Applications of Perovskite Materials

Contact Info

Product

Resources

About

Enhancement in thermoelectric properties of n-type (La_0.7Sr_0.3MnO₃)_0.5.(NiO)_0.5: composite and nano-structure effect

Enhancement in thermoelectric properties of n-type (La_0.7Sr_0.3MnO₃)_0.5.(NiO)_0.5: composite and nano-structure effect

Cation-Dependent Hot Carrier Cooling in the Lead-Free Bismuth Halide A₃Bi₂I₉ (A = FA, MA, and Cs) Perovskite