Potassium doping induced changes of magnetic and magnetocaloric properties of La 0.78 Cd 0.22−x K x MnO 3  (x  =  0.00, 0.10, 0.15 and 0.20) manganites

Messaoui, I.; Riahi, K.; Kumaresavanji, M.; Cheikhrouhou‐Koubaa, W.; Cheikhrouhou, A.

doi:10.1016/j.jmmm.2017.09.010

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…where 𝑟 is the atomic radius, for 𝑟 𝐿𝑎 , 𝑟 𝐵𝑎 , 𝑟 𝑀𝑛 , 𝑟 𝐹𝑒 , and 𝑟 𝑂 values are 117.2, 149, 72, 69, and 128 pm [19] . The calculation result of Equation ( 1) for the range of 𝑥 = 0 − 0.5 values is 𝑡 𝐺 = 0.891 − 0.898, which is known to be in the range of rhombohedral or orthorhombic structures reaching stability in the range of 0.89 < 𝑡 𝐺 < 1.2 [26][27][28] .…”

Section: Methodsmentioning

confidence: 99%

First-Principle Investigation of La0.7Ba0.3Mn(1-x)FexO3 Structural Properties Using CASTEP

Saptari,

Aulia,

Rizaldy

et al. 2023

Indonesian J Appl Phys

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We conducted first-principles Density Functional Theory (DFT) calculations using the CASTEP software package to investigate the crystal structure and mechanical properties of Fe3+-doped La0.7Ba0.3MnO3 material at the Mn3+ site, with doping concentrations ranging up to 50%. Through geometry optimization, we simulated the X-ray diffraction (XRD) pattern. We observed that the doping of Fe did not result in a shift in the peak positions of the diffraction pattern. However, it led to an increase in intensity at the [012] peak and the splitting of peaks [104] and [110]. Regarding the mechanical properties, we examined the elastic constants and observed a reduction in the Bulk, Shear, and Young's modulus values. The Shear and Bulk modulus and Poisson's ratio indicated that La0.7Ba0.3Mn(1-x)FexO3 becomes less ductile with increased Fe3+ doping content. Furthermore, we performed calculations for the Debye temperature, which revealed a decrease in the thermal conductivity of the La0.7Ba0.3Mn(1-x)FexO3 material.

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Section: Methodsmentioning

confidence: 99%

First-Principle Investigation of La0.7Ba0.3Mn(1-x)FexO3 Structural Properties Using CASTEP

Saptari,

Aulia,

Rizaldy

et al. 2023

Indonesian J Appl Phys

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“…Previously, there have been several works that report the effect of K + ion substitution on the magnetic entropy change of LMO-based compounds. Roughly, the parental compound used in previous works can be classified into three different groups which are La-Cd-MnO 3 , La-Ca-MnO 3 , and La-Sr-MnO 3 [55,[67][68][69][70]. In La-Cd-MnO 3 and La-Ca-MnO 3 compounds, substitution by K + ion increased the T C of the samples, accompanied by a monotonous increase in the value of −∆S M, MAX .…”

Section: It Is Clear That the −∆ ( mentioning

confidence: 99%

“…According to the work of Dhahri et al, the T C for La 0.8 Cd 0.2−x K x MnO 3 increases from 260 K to 282 K [69]. Meanwhile, Messaoui et al reported that the T C for La 0.78 Cd 0.22−x K x MnO 3 increased from 202 K to 326 K [68]. In line with the result of La-Cd-MnO 3 compound, a similar result was also found in the work of Koubaa et al and Ben Rejeb et al According to the work of Koubaa et al, the T C of La 0.65 Ca 0.35−x K x MnO 3 increased from 248 to 310 K with K + ion concentration [55].…”

Section: It Is Clear That the −∆ ( mentioning

confidence: 99%

Role of Potassium Substitution in the Magnetic Properties and Magnetocaloric Effect in La0.8−xKxBa0.05Sr0.15MnO3 (0 ≤ x ≤ 0.20)

et al. 2020

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The magnetic and magnetocaloric effects of potassium-substituted La0.8−xKxBa0.05Sr0.15MnO3 (0 ≤ x ≤ 0.20) manganite were explored. The samples in polycrystalline form were synthesized by the sol–gel method, with a final sintering temperature of 1100 °C. Powder X-ray diffraction (XRD) patterns refined by Rietveld refinement show that all samples crystallized in rhombohedral structure with R-3c space group. The unit cell volume of the samples decreases with increasing potassium concentration. In addition, small changes in average bond length and bond angle are also observed in the samples. Scanning electron microscope (SEM) images reveal that the largest average grain size was observed for x = 0.10. Field-cooled (FC) magnetization measurements show that the Curie temperature ( T C ) of the samples increases from 320 K for x = 0 to 360 K for x = 0.2. The largest magnetocaloric (MCE) effect, which is represented by maximum magnetic entropy change (− Δ S M , M A X ), reaches its greatest value for the x = 0.10 sample. The monotonous increase in T C suggests that TC is mainly governed by the ferromagnetic coupling between Mn ions induced by the changes on average bond length and bond angle. The obtained − Δ S M , M A X value suggests that MCE property is more sensitive to Zener theory of double exchange, which is strongly related to the Mn3+/Mn4+ ratio of the samples.

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“…11,12 In most of the studies, perovskite structure concentrated on the influence of A site doping is responsible for the strong lattice strain induced in the system. For example, Messaoui et al 13 studied the influence of K ions on the physical properties of La 0.78 Cd 0.22 MnO 3 (0 ≤ x ≤ 0.2) manganites prepared by solid-state reaction route. They observed paramagnetic to ferromagnetic phase transition through the zero field-cooled (ZFC) and field-cooled (FC) magnetization measurements.…”

Section: Introductionmentioning

confidence: 99%

Investigation of structural, optical, electrical, and magnetic properties of Fe‐doped La_0.7Sr_0.3MnO₃ manganites

Hassan¹,

Khan

Husain

et al. 2020

Int J Applied Ceramic Tech

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In this work, the physical properties of nanocrystalline samples of La0.7Sr0.3Mn1−xFexO3 (0.0 ≤ x ≤ 0.20) perovskite manganites synthesized by the reverse micelle (RM) technique were explored in detail. The phase purity, crystal structure, and crystallite size of the samples were determined using X‐ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. All the samples had rhombohedral crystal structure and crystallite size increased with increase in Fe content in La0.7Sr0.3MnO3. The scanning electron micrographs (SEMs) exhibited smooth surface morphology and nonuniform shape of the particles. The optical properties studied using UV‐visible absorption spectroscopy revealed a decrease in the absorbance and optical band gap with an increase in Fe content in La0.7Sr0.3MnO3 compound. The temperature‐dependent resistivity measurements revealed semiconducting nature of x = 0 and 0.1 samples up to the studied temperature range, while a metal‐to‐insulator transition was observed at higher Fe doping. Magnetic studies revealed weak ferromagnetism in all the samples and a reduction in the maximum magnetization with an increase in Fe content. A close correlation between electrical transport and magnetic properties was observed with the doping of Fe ion in La0.7Sr0.3MnO3 at Mn site. These results advocate strong interactions associated with the double exchange mechanism among Fe3+ and Mn3+ ions.

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Potassium doping induced changes of magnetic and magnetocaloric properties of La 0.78 Cd 0.22−x K x MnO 3 (x = 0.00, 0.10, 0.15 and 0.20) manganites

Cited by 13 publications

References 40 publications

First-Principle Investigation of La0.7Ba0.3Mn(1-x)FexO3 Structural Properties Using CASTEP

First-Principle Investigation of La0.7Ba0.3Mn(1-x)FexO3 Structural Properties Using CASTEP

Role of Potassium Substitution in the Magnetic Properties and Magnetocaloric Effect in La0.8−xKxBa0.05Sr0.15MnO3 (0 ≤ x ≤ 0.20)

Investigation of structural, optical, electrical, and magnetic properties of Fe‐doped La_0.7Sr_0.3MnO₃ manganites

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Potassium doping induced changes of magnetic and magnetocaloric properties of La 0.78 Cd 0.22−x K x MnO 3 (x = 0.00, 0.10, 0.15 and 0.20) manganites

Cited by 13 publications

References 40 publications

First-Principle Investigation of La0.7Ba0.3Mn(1-x)FexO3 Structural Properties Using CASTEP

First-Principle Investigation of La0.7Ba0.3Mn(1-x)FexO3 Structural Properties Using CASTEP

Role of Potassium Substitution in the Magnetic Properties and Magnetocaloric Effect in La0.8−xKxBa0.05Sr0.15MnO3 (0 ≤ x ≤ 0.20)

Investigation of structural, optical, electrical, and magnetic properties of Fe‐doped La0.7Sr0.3MnO3 manganites

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Investigation of structural, optical, electrical, and magnetic properties of Fe‐doped La_0.7Sr_0.3MnO₃ manganites