A systematic study on the synthesis of Ca, Gd codoped cerium oxide by combustion method

Ainirad, Ali; Motlagh, M.M. Kashani; Maghsoudipoor, A.

doi:10.1016/j.jallcom.2010.10.137

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…This linear behavior supports the inherent assumption underlying the experimental practice of codoping in several ceria based applications. 68,131 Figure 6b shows the TEC of the lanthanides La, Sm, and Gd to coincide nicely, while the Yb curve shows much higher values. This difference in behavior is most likely linked to the filled 4 f shell of Yb (which is only partially filled for Sm and Gd).…”

Section: Bulk Modulus (Bm) and Thermal Expansion Coefficients (Tecs)mentioning

confidence: 82%

Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

et al. 2014

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The modification of CeO 2 properties by means of aliovalent doping is investigated within the ab-initio density functional theory framework. Lattice parameters, dopant atomic radii, bulk moduli and thermal expansion coefficients of fluorite type Ce 1−x M x O 2−y (with M= Mg, V, Co, Cu, Zn, Nb, Ba, La, Sm, Gd, Yb, and Bi) are presented for 0.00 ≤ x ≤ 0.25. The relative stability of the dopants is discussed, and the influence of oxygen vacancies is investigated. It is shown that oxygen vacancies tend to increase the lattice parameter, and strongly decrease the bulk modulus. Defect formation energies are correlated with calculated crystal radii and covalent radii of the dopants, and are shown to present no simple trend. The previously observed inverse relation between the thermal expansion coefficient and the bulk modulus [J. Am. Ceram. Soc. 97(1), 258 (2014)] is shown to persist independent of the inclusion of charge compensating vacancies.

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Section: Bulk Modulus (Bm) and Thermal Expansion Coefficients (Tecs)mentioning

confidence: 82%

Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

et al. 2014

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“…Recently, remarcable results in the improvement of the ionic conductivity have been obtained by creating structural oxygen vacancies in the single phase material by ceria co-doping with dopant pairs, such as: Gd-Ca [9], Gd-Pr [10], La-Mg [11], Ca-Mn-Y * Corresponding author. Tel.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of ceria/carbonate nanocomposites

Ristoiu

Gabor

Rada

et al. 2012

Journal of Alloys and Compounds

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“…The added Dy 3+ does not affect the crystal structure of CaMnO 3 . The crystallite size D of the Ca 0.8 Dy 0.2 MnO 3 pellets can be calculated from the Scherrer formula: D = (0.9 λ )/( β cos θ ), where λ is the wavelength of radiation, θ is the angle of the diffraction peak, and β is the full width at half maximum of the diffraction peak (in radian) [ 9 ]. The calculated crystallite sizes of the sintered Ca 0.8 Dy 0.2 MnO 3 are in the range of 20.0-24.5 nm.…”

Section: Resultsmentioning

confidence: 99%

Thermoelectric properties of Ca0.8Dy0.2MnO3 synthesized by solution combustion process

Park¹,

Lee²

2011

Nanoscale Res Lett

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High-quality Ca0.8Dy0.2MnO3 nano-powders were synthesized by the solution combustion process. The size of the synthesized Ca0.8Dy0.2MnO3 powders was approximately 23 nm. The green pellets were sintered at 1150-1300°C at a step size of 50°C. Sintered Ca0.8Dy0.2MnO3 bodies crystallized in the perovskite structure with an orthorhombic symmetry. The sintering temperature did not affect the Seebeck coefficient, but significantly affected the electrical conductivity. The electrical conductivity of Ca0.8Dy0.2MnO3 increased with increasing temperature, indicating a semiconducting behavior. The absolute value of the Seebeck coefficient gradually increased with an increase in temperature. The highest power factor (3.7 × 10-5 Wm-1 K-2 at 800°C) was obtained for Ca0.8Dy0.2MnO3 sintered at 1,250°C. In this study, we investigated the microstructure and thermoelectric properties of Ca0.8Dy0.2MnO3, depending on sintering temperature.

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A systematic study on the synthesis of Ca, Gd codoped cerium oxide by combustion method

Cited by 14 publications

References 25 publications

Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

Electrical properties of ceria/carbonate nanocomposites

Thermoelectric properties of Ca0.8Dy0.2MnO3 synthesized by solution combustion process

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A systematic study on the synthesis of Ca, Gd codoped cerium oxide by combustion method

Cited by 14 publications

References 25 publications

Aliovalent doping of CeO2: DFT study of oxidation state and vacancy effects

Aliovalent doping of CeO2: DFT study of oxidation state and vacancy effects

Electrical properties of ceria/carbonate nanocomposites

Thermoelectric properties of Ca0.8Dy0.2MnO3 synthesized by solution combustion process

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Product

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Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects