Effects of sintering on the structural, microstructural and magnetic properties of nanoparticle manganite Ca1−Gd MnO3 (x=0.05, 0.1, 0.15, 0.2)

Rosić, Milena; Kljaljević, Ljiljana; Jordanov, Dragana; Stoiljković, Milovan; Kusigerski, Vladan; Spasojević, Vojislav; Matović, Branko

doi:10.1016/j.ceramint.2015.08.041

Cited by 15 publications

(5 citation statements)

References 26 publications

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“…4. Two strong bands at 1635 and 1415 cm -1 represent the vibration for the ionized carboxylate symmetric and asymmetric C-O stretching [16,17].Furthermore, the content of calcium and potassium carbonates increased with K 2 CO 3 load. This effect can be attributed to the fact that the calcination process was performed under static air.…”

Section: Resultsmentioning

confidence: 93%

Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

et al. 2018

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Oxide materials based on calcium manganite show clear prospects as thermoelectrics, provided by their stability at high temperatures and inherent flexibility in tuning the relevant electrical and thermal transport properties. Donor-doped CaMnO 3 is an n-type semiconductor with a perovskite structure and relatively high thermoelectric performance. In this work, the precursor powders have been modified through potassium carbonate additions to produce Ca 0.9 Gd 0.1-MnO 3 pellets without the usual delamination problems occurring during the compaction process. In order to demonstrate the relevant effects, several samples with different amounts of potassium carbonate (0-15 wt%) have been prepared. The results showed that potassium additions significantly facilitate the compaction procedure, while also improving the thermoelectric performances. The results also highlight the importance of porosity control for improving ZT, by decreasing the thermal conductivity without reduction of the electrical performance. The highest ZT values were observed for the samples processed at 15 wt% of potassium carbonate addition, exhibiting an improvement at least 30% at 800°C when compared to the pure samples.

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Section: Resultsmentioning

confidence: 93%

Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

et al. 2018

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“…54 The absorption band seen at 425 cm −1 resembles the bending mode owing to the changes in the Mn–O–Mn bond angle. 55 The broadband at around 3381 cm −1 and the weak band at 1637 cm −1 originated from the stretching and bending vibrations of the –OH bond, respectively. The weak band at about 2923 cm −1 corresponds to the C–H stretching vibrational mode.…”

Section: Resultsmentioning

confidence: 99%

Porous perovskite CaMnO₃/rGO hybrid as an efficient electrocatalyst in lithium–oxygen batteries

et al. 2022

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“…An analysis of the possible changes in the morphology was performed in selected cathode/electrolyte systems (Pr = 0.52 or 0. It has been previously stated that the morphology is dependent of the preparation method, for example, the manganite Ca0.9Gd0.1MnO synthesized by citrate method has shown morphologies with ellipsoid particles concentrated in the grain boundary and intergrains of spherical and polyhedric shapes [29]; whereas LaMO3 perovskites with different elements in the B site (M=Al, Cr, Mn, Fe, Co) synthesized by the microwave-assisted method have shown polyhedric particles of submicron or nanometric size [30]. Additionally, it has been shown that the morphology is also affected by the temperature, LaMnO3 perovskite sintered at 1300 °C showed a compact and void-free morphology with high density [63].…”

Section: Characterization Of the Cathode/electrolyte Systemsmentioning

confidence: 99%

“…An alternative to modify the microstructure and improve TBP is through doping or cation substitution in either A or B sites of LSM perovskites [19,26,27]. The LSM has been doped in the A-site by lanthanide elements (Ce, Pr, Nd, Sm and Gd) or in the B-site (Fe, Cr, Co, Ni and Ti ) to reduce the mismatch of the thermal expansion coefficient with either Gd-doped CeO2 (GDC) or YSZ electrolytes as well as to reduce the polarization resistance of the cell [16,26,[28][29][30]. Other elements that can be considered to dope and substitute the cationic site A of ABO3 perovskites with excellent catalytic activity during oxygen reduction are Pr and Ca [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: Electrical and electrochemical performance

Ferrel-Álvarez

Domínguez‐Crespo

Cong

et al. 2021

Journal of Alloys and Compounds

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La0.7-xPrxCa0.3MnO3 (LPCM) perovskites previously synthesized by the microwave-assisted method at 4 minutes and with different stoichiometry (x=0.35, 0.52 and 0.63) were evaluated through thermogravimetric analysis (TGA), electrical conductivity, thermal expansion coefficient (TEC), scanning electron microscopy (SEM), Brunauer-Emmet-Teller (BET) analysis and electrochemical impedance spectroscopy (EIS) using yttria stabilized zirconia (YSZ) as an electrolyte. The results are discussed in terms of the potential as cathode material to be applied in solid oxide fuel cells (SOFCs) applications at temperatures from 600 to 800 °C. Results derived from TGA showed that Pr promotes the uncoupling oxygen and oxygen vacancies favoring the fuel combusting. Also, TEC analysis revealed adequate stability between the YSZ electrolyte and the La0.7-xPrxCa0.3MnO3 to avoid cracking or failing, especially with high amount of Pr. The transition in morphology from irregular to regular shapes improves the BET and Barret-Joyner-Halenda (BJH) surfaces and promotes the triple phase boundary (TPB) connectivity. The electrical conductivity correlated to the availability in oxygen vacancies showed maximum conductivities in the order of 10 -2 S cm -1 . Activation energy (Ea) was found to be reduced with a minimum quantity of Pr (0.071 eV). EIS results indicate that the oxygen vacancies in the LPCM/YSZ system were better promoted with the highest amount of Pr= 0.63 (=0.9 V, 800 °C and 0.06 V of amplitude) in comparison with the minimum, Pr=0.35 (=1.2 V, 800 °C and 0.06 V of amplitude).

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Effects of sintering on the structural, microstructural and magnetic properties of nanoparticle manganite Ca1−Gd MnO3 (x=0.05, 0.1, 0.15, 0.2)

Cited by 15 publications

References 26 publications

Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

Porous perovskite CaMnO₃/rGO hybrid as an efficient electrocatalyst in lithium–oxygen batteries

Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: Electrical and electrochemical performance

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Effects of sintering on the structural, microstructural and magnetic properties of nanoparticle manganite Ca1−Gd MnO3 (x=0.05, 0.1, 0.15, 0.2)

Cited by 15 publications

References 26 publications

Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

Porous perovskite CaMnO3/rGO hybrid as an efficient electrocatalyst in lithium–oxygen batteries

Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: Electrical and electrochemical performance

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Porous perovskite CaMnO₃/rGO hybrid as an efficient electrocatalyst in lithium–oxygen batteries