Electrical conductivity of Ca-substituted lanthanum manganites

Sfîrloagă, Paula; Poienar, Maria; Mălăescu, I.; Lungu, Antoanetta; Míhali, Ciprian; Vlăzan, Paulina

doi:10.1016/j.ceramint.2018.01.029

Cited by 18 publications

(6 citation statements)

References 28 publications

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“…Analysis by X-ray diffraction was performed for the samples obtained as described in the previous section. The sol-gel method with thermal treatment at a low temperature obtains well-crystallized samples without secondary phases (Figure 1), as has been already reported in previous studies for undoped and doped/substituted LaMnO 3 perovskite samples [15][16][17][24][25][26]. The diffractogram visualizations in Figure 1 indicate that some of the peaks are split for the undoped material compared to the 1% Pd 2+ , Ag + , or Y 3+ doped LaMnO 3 samples (insert Figure 1).…”

Section: Xrd Analysissupporting

confidence: 78%

“…The resulting gels were dried in an oven at 80 • C for 4 h and then calcined at 600 • C for 6 h to obtain the final perovskite samples. Perovskite manganite synthesis by sol-gel technique has been previously reported for undoped [15][16][17][18][19][20][21][22][23], doped (for example with Fe [24], N [16], Ag [25], or Sr [21]), or substituted LaMnO 3 materials (with Pd [26], Ca [15], Fe, Co, or Ni [23]), and is considered to be a successful and flexible synthesis route to obtain well-crystallized micro-or nanomaterials from this family of compounds [27].…”

Section: Methodsmentioning

confidence: 99%

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Investigation of Catalytic and Photocatalytic Degradation of Methyl Orange Using Doped LaMnO3 Compounds

et al. 2022

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LaMnO3 and 1% Pd-, Ag-, or Y-doped perovskite type nanomaterials were prepared by the sol-gel method, followed by heat treatment at a low temperature (600 °C for 6 h). The investigation through X-ray diffraction and FT-IR spectroscopy indicated that all samples were well crystallized, without secondary phases, and that the transition metal doping changed the crystal structure from the R-3c space group for the undoped LaMnO3 to the Pm-3m space group for the doped perovskite compounds. In this research paper, the efficiencies of the perovskite LaMnO3 materials for methyl orange removal were analyzed, wherein the effect of the doping ions and of the pH on the catalytic activity were studied together with a kinetic approach for the LaMnO3 materials at different values of the pH. Moreover, in the catalytic activity, it should be noted that a slightly better performance was obtained for the Ag-doped materials compared to the Y- and Pd-doped perovskite samples. The results presented for the perovskite LaMnO3 nanomaterials reinforce the interest in these multifunctional materials to be used in industrial applications; e.g., in water treatment.

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Section: Xrd Analysissupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Investigation of Catalytic and Photocatalytic Degradation of Methyl Orange Using Doped LaMnO3 Compounds

et al. 2022

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“…Additionally, the second region; named σ ac is located at a high frequency. It is noteworthy that the total conductance is the sum of σ dc and σ ac explained by the "universal" Jonscher power law [10] as follow:…”

Section: Electrical Conductivity Measurementmentioning

confidence: 99%

Study of the Dielectric Behavior as a Function of the Frequency at Different Temperatures on the Sample Pr0.525Y0.075Ca0.1Sr0.3Mn0.975Fe0.025O3

Baazaoui¹,

Moulahi²,

Hamdaoui³

et al. 2021

Int J At Nucl Phys

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Structural and dielectric properties of Pr 0.525 Y 0.075 Ca 0.1 Sr 0.3 Mn 0.975 Fe 0.025 O 3 manganite system are investigated. The XRD analysis confirms that all compounds crystallized in a rhombohedral structure ( 3R c space group). Using complex impedance spectroscopy, we confirm that our sample proves a semiconductor behavior which is governed by the increase of the conductance as function of temperature. From the complex impedance spectra, we conclude that the electrical mechanism for each temperature indicate a non-Debye type relaxation behavior. The achieved activation energy is found to be E a = 0.117 ev. Indeed, we proved that the abrupt decrease of dielectric lost a δ with frequency is related to the decrease of the grain resistance at high frequencies.

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“…The above reasons lead to decrease in the repeatability of the same parameter, and consequently the use of a perovskite phase material solid solution. It was found through investigation that LaMnO 3 has a lower resistance at room temperature and can be synthesized as a low resistance phase …”

Section: Introductionmentioning

confidence: 99%

“…It was found through investigation that LaMnO 3 has a lower resistance at room temperature and can be synthesized as a low resistance phase. 13 Although the predecessors have done similar research, it is not possible to fully confirm the B value of a certain content of solid solution, just to make a rough guess. 14 Typically, in the field of NTC thermistors, the B value is a material constant describing the physical properties of the NTC thermistor material, and its unit is K. (Generally called as the thermistor coefficient, B-constant of thermistor or sensitivity index.)…”

Section: Introductionmentioning

confidence: 99%

Correlation between B value deviation and sintering temperature of perovskite solid solution materials

et al. 2019

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The effects of different sintering temperatures on the system of Ba0.5Sr0.5TiO3–La0.8Ca0.2MnO3 (BST‐LCM) material were investigated by means of scanning electron microscopy, X‐ray, resistance‐temperature measurements, and X‐ray photoelectron spectroscopy. X‐ray diffraction and X‐ray photoelectron spectroscopy confirm that BST‐LCM is completely miscible and BST is the main phase, which under the premise of following the theory of small polaron conduction, titanium ions interact with manganese ions, which affects the electrical properties of the system of BST‐LCM material. For the electrical properties of related, the LCM content is inversely proportional to the activation energy. Through the linear fitting of the experimental data, the empirical formula between the sintering temperature B value and the content of solid solution is obtained, and the approximate B value within a certain range can be preliminarily calculated.

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Electrical conductivity of Ca-substituted lanthanum manganites

Cited by 18 publications

References 28 publications

Investigation of Catalytic and Photocatalytic Degradation of Methyl Orange Using Doped LaMnO3 Compounds

Investigation of Catalytic and Photocatalytic Degradation of Methyl Orange Using Doped LaMnO3 Compounds

Study of the Dielectric Behavior as a Function of the Frequency at Different Temperatures on the Sample Pr0.525Y0.075Ca0.1Sr0.3Mn0.975Fe0.025O3

Correlation between B value deviation and sintering temperature of perovskite solid solution materials

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