Impact of K doping on room-temperature temperature coefficient of resistivity of La0.7(Ag0.3-K )MnO3 (0.160 ≤ x ≤ 0.180) polycrystalline ceramics

Jin, Shuaizhao; Zhang, Shuai; Yu, Xiaohan; Guan, Xiaoli; Li, Hongjiang; Chu, Kaili; Pu, Xingrui; Gu, Xin; Liu, Xiang

doi:10.1016/j.ceramint.2021.05.195

Cited by 15 publications

(4 citation statements)

References 45 publications

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“…Consequently, the MnO 6 octahedral environment is disturbed, causing changes in average ⟨Mn–O⟩ bond lengths and ⟨Mn–O–Mn⟩ bond angles. In general, electronic and magnetic properties are studied in the context of the Zener double-exchange theory, which is governed by an interaction between Mn 3+ and Mn 4+ ions and strong spin–lattice coupling arising from a lattice structural change in ⟨Mn–O⟩ bond distance as well as ⟨Mn–O–Mn⟩ bond angle. , Figure depicts the overall changes in these parameters. The substituted specimens exhibit active phonon modes within the far-IR regime, indicative of the distinctive MnO 6 octahedral environment inherent to the perovskite structure (detailed in Supporting Information, Figure S7).…”

Section: Resultsmentioning

confidence: 99%

“…According to the double exchange model, the increase in T C is a result of the strong overlap between Mn 3d and O 2p orbitals. A relation gives the empirical expression for one-electron bandwidth ( W ), , which is analogous to the transfer interaction of mobile e g carriers characterized by an overlap between Mn 3d and O 2p orbitals , W ∝ cos nobreak0em.25em⁡ 1 2 ( π − ⟨ M n − O − M n ⟩ ) false( d ⟨ normalM normaln − normalO ⟩ false) 3.5 where d ⟨Mn–O⟩ is the average ⟨Mn–O⟩ bond length.…”

Section: Resultsmentioning

confidence: 99%

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Multifaceted Roles of Ag⁺ Ions within and outside La–Ca–MnO₃ Perovskite Manganites: Unveiling the Room Temperature Magnetocaloric Effect

Nadig,

Toulemonde,

Alagarsamy

et al. 2024

J. Phys. Chem. C

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The primary objective of this study is to unravel the role of Ag + ions in A-site substitutions and to explore their potential in achieving room-temperature magnetocaloric response. The investigation is structured around three distinct scenarios: direct Ag + substitution, Ag + introduction as a composite, and the absence of Ag + as an A-site deficient system. Through these approaches, the study seeks to elucidate the multifaceted roles played by Ag + ions, providing valuable insights into their influence on structural and magnetic properties. In the case of Ag + substitution at the A-site, temperature-dependent magnetization reveals a two-step dependence with distinctive inflection points, attributed to the Curie points of the Pnma and R3̅ c phases, respectively. As a consequence, the maximum value of the isothermal magnetic entropy change (−ΔS M ) for the lower substitution (x = 0.05) is found to be 4.5 J/kg K, achieved at 273.5 K for ΔH = 20 kOe, while the same is retained at about 4.25 J/kg K for higher substitution (x = 0.2). Remarkably, −ΔS M peaks at room temperature of 306.5 K in case of x = 0.2. Furthermore, an effective screening is undertaken, evaluating the figure-of-merit to elucidate the suitability and efficacy of the material. The temperature-averaged entropy change (TEC) values, TEC (ΔT H−C = 3 K) and TEC (ΔT H−C = 5 K), reached 4.15 and 4.09 J/kg K, respectively, under a low magnetic field change of 20 kOe. Overall, the tuning of the phase transition without compromising the low-field magnetocaloric response was achieved solely through substitution, highlighting its pivotal role over composite and deficient systems.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Multifaceted Roles of Ag⁺ Ions within and outside La–Ca–MnO₃ Perovskite Manganites: Unveiling the Room Temperature Magnetocaloric Effect

Nadig,

Toulemonde,

Alagarsamy

et al. 2024

J. Phys. Chem. C

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“…Recently, much studies have been produced to study the electrical transport characteristics (TCR) of perovskite-structured oxides prepared using adopting conventional sol-gel technology. [4][5][6][7][8] The doped manganese oxide has many unique properties, such as phase separation, colossal magnetoresistance, the coexistence of diverse ordering types, etc. Electrical transport characteristics and magnetic properties are widely investigated for divalent alkaline-doped manganites.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, much studies have been produced to study the electrical transport characteristics (TCR) of perovskite‐structured oxides prepared using adopting conventional sol–gel technology. [ 4–8 ]…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Optical, Electrical, Magnetic, and Thermopower Properties of LaMnO₃ by Potassium‐Doping

Mohamed

Ahmed

et al. 2023

Physica Status Solidi (b)

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Optical, magnetoresistance, and thermoelectric properties of La1−xKxMnO3 (x = 0.05, 0.15, and 0.25) compounds have been investigated. The crystallography demonstrates that the samples x = 0.05 and 0.15 are a single‐phase rhombohedral () structure, while x = 0.25 is near to a single rhombohedral phase with a minor amount of Mn3O4 (with a ratio of ≈2%). The optical properties manifest that the reflectivity decreases slightly with increasing x‐doping, where the sample of x = 0.05 has the lowest reflection value, making it a promising material for photovoltaic applications. Electrical resistivity measurements show that the samples have a metal–semiconductor transition, and the transition temperature Tms decreases with the K content. The thermoelectric data show a remarkable coincidence behavior of the ρ–T relationship, which has a peak at a transition temperature (TS). Magnetic susceptibility data show that the samples undergo ferro‐paramagnetic transition at a certain temperature (Curie temperature).

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Structural and electrical properties of monovalent K doping in Pr0.6(Sr1-xKx)0.4MnO3 polycrystalline ceramics

Zhao

Guan

et al. 2023

J Mater Sci: Mater Electron

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Impact of K doping on room-temperature temperature coefficient of resistivity of La0.7(Ag0.3-K )MnO3 (0.160 ≤ x ≤ 0.180) polycrystalline ceramics

Cited by 15 publications

References 45 publications

Multifaceted Roles of Ag⁺ Ions within and outside La–Ca–MnO₃ Perovskite Manganites: Unveiling the Room Temperature Magnetocaloric Effect

Multifaceted Roles of Ag⁺ Ions within and outside La–Ca–MnO₃ Perovskite Manganites: Unveiling the Room Temperature Magnetocaloric Effect

Enhancement of Optical, Electrical, Magnetic, and Thermopower Properties of LaMnO₃ by Potassium‐Doping

Structural and electrical properties of monovalent K doping in Pr0.6(Sr1-xKx)0.4MnO3 polycrystalline ceramics

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Impact of K doping on room-temperature temperature coefficient of resistivity of La0.7(Ag0.3-K )MnO3 (0.160 ≤ x ≤ 0.180) polycrystalline ceramics

Cited by 15 publications

References 45 publications

Multifaceted Roles of Ag+ Ions within and outside La–Ca–MnO3 Perovskite Manganites: Unveiling the Room Temperature Magnetocaloric Effect

Multifaceted Roles of Ag+ Ions within and outside La–Ca–MnO3 Perovskite Manganites: Unveiling the Room Temperature Magnetocaloric Effect

Enhancement of Optical, Electrical, Magnetic, and Thermopower Properties of LaMnO3 by Potassium‐Doping

Structural and electrical properties of monovalent K doping in Pr0.6(Sr1-xKx)0.4MnO3 polycrystalline ceramics

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Product

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Multifaceted Roles of Ag⁺ Ions within and outside La–Ca–MnO₃ Perovskite Manganites: Unveiling the Room Temperature Magnetocaloric Effect

Multifaceted Roles of Ag⁺ Ions within and outside La–Ca–MnO₃ Perovskite Manganites: Unveiling the Room Temperature Magnetocaloric Effect

Enhancement of Optical, Electrical, Magnetic, and Thermopower Properties of LaMnO₃ by Potassium‐Doping