Microwave-assisted combustion synthesis of nanocrystalline Sm-doped La 2 Mo 2 O 9 oxide-ion conductors for SOFC application

Saradha, T.; Angaiah, Subramania; Balakrishnan, Kalpana; Muzhumathi, S.

doi:10.1016/j.materresbull.2015.03.071

Cited by 15 publications

(4 citation statements)

References 26 publications

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“…For example, when Samarium (Sm) is doped, it prevented phase transition of La 2 Mo 2 O 9 from one phase to another efficiently at room temperature. It is also reported that the distortion of phase appeared when Mo +6 is replaced by Sulphur cation S +6 [27]. The compound with S +6 doping show stability of this phase at high temperature for Sulphur content 0.1 while the formation of Single phase LAMOX is reported at 850 °C with 0.8% substitution of S +6 [25].…”

Section: Introductionmentioning

confidence: 84%

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Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉

Mazhar¹,

Bılal²,

Waheed³

et al. 2021

Phys. Scr.

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Nanocrystalline Lanthanum Molybdenum Oxide powders (having crystallite size from 67 nm-287 nm) and chemical composition: La2−xFexMo2O9 (x = 0.0, 0.012, 0.024, 0.036), synthesized by hydrothermal method is being reported in this research. XRD, SEM and EDS were used to study the structure, morphology, and chemical compositions respectively. Temperature dependent electrical and dialectic properties were examined at temperatures ranging from 300 K to 450 K. DC electrical conductivity was found to be increasing with increasing Fe3+ concentration. Furthermore, the measured dielectric loss was very small. It also exhibited a decreasing trend with increasing Fe3+ concentration. A lower dielectric loss makes such materials suitable potential candidates for applications in super capacitors.

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Section: Introductionmentioning

confidence: 84%

“…Whereas the Pr doping increases its value to 0.165 S cm −1 [31]. Maximum ionic conductivity (0.196 S cm −1 ) was obtained at relatively low temperature 750 °C [27]. Alkaline doping (Na, K & Rb) display deviation from Arrhenius behavior [32].…”

Section: Introductionmentioning

confidence: 95%

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉

Mazhar¹,

Bılal²,

Waheed³

et al. 2021

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…The hysteretic feature and strain changes during the SMT of VO 2 will deteriorate the device performance and reduce the reliability of the device [11]. On the other hand, relatively high RT resistivity (> 10 Ω•cm) restricts the choice of device operating parameters [12,13]. Therefore, preparing the vanadium dioxide films with high TCR, non-SMT, low resistivity, and crystallization structure becomes a challenge for developing high-performance thermal-sensitive materials for microbolometers.…”

Section: Introductionmentioning

confidence: 99%

A Monoclinic V1-x-yTixRuyO2 Thin Film with Enhanced Thermal-Sensitive Performance

et al. 2020

Nanoscale Res Lett

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Preparing the thermal-sensitive thin films with high temperature coefficient of resistance (TCR) and low resistivity by a highly compatible process is favorable for increasing the sensitivity of microbolometers with small pixels. Here, we report an effective and process-compatible approach for preparing V 1-x-y Ti x Ru y O 2 thermal-sensitive thin films with monoclinic structure, high TCR, and low resistivity through a reactive sputtering process followed by annealing in oxygen atmosphere at 400°C. X-ray photoelectron spectroscopy demonstrates that Ti 4+ and Ru 4+ ions are combined into VO 2. X-ray diffraction, Raman spectroscopy, and transmission electron microscopy reveal that V 1-x-y Ti x Ru y O 2 thin films have a monoclinic lattice structure as undoped VO 2. But V 1-x-y Ti x Ru y O 2 thin films exhibit no-SMT feature from room temperature (RT) to 106°C due to the pinning effect of high-concentration Ti in monoclinic lattice. Moreover, RT resistivity of the V 0.8163 Ti 0.165 Ru 0.0187 O 2 thin film is only one-eighth of undoped VO 2 thin film, and its TCR is as high as 3.47%/°C.

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“…Based on previous advantages, diverse enhancements in components of these devices have been suggested, mainly in the field of anodes, since they are responsible for oxidation reaction between the fuel and the oxygen ions (O 2-), moreover to facilitate the move of electrons produced in this reaction and transport it to external path without electrical loss [4] . Therefore interest has focused on the use of alternative materials for anodes such as perovskites [5] , fluorites [6] , ruthenium oxides [7] and pyrochlores [8] . Among others, the cerium oxides derived from fluorite structure type and modified with transition elements, are one of the most promissory materials that have reduced the sulphur poisoning and have improved the electrical performance, with high levels of reliability, stability, conductivity, resistance to carbon deposition and good catalytic properties on steam methane reforming [9] .…”

Section: Introductionmentioning

confidence: 99%

SYNTHESIS AND CHARACTERIZATION OF CERIUM FLUORITES BASED ON Ce1-xLn xO2-δ SYSTEM (Ln: Nd3+, Sm3+, Eu3+, Gd3+, Dy3+ AND Ho3+)

Cuaspud

2015

J. Chil. Chem. Soc.

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This paper describes the synthesis of 18 oxides of Ce 1-x Ln x O 2 (Ln: Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Dy 3+ and Ho 3+), with x = 0.05, 0.10 and 0.15 mol% by use of a wet chemical route that involving the obtention of coordination compounds type citrate, which allow the generation of a number of chemical and surface properties with potential catalytic applications in solid oxide fuel cells technologies. The materials obtained by this route, has a high purity and homogeneity, enabling calcination temperatures and residence times considerably brief, in comparison with conventional synthetic routes. All oxides, were calcined at 300 °C under flow oxygen and were characterized by X-ray diffraction (XRD), from obtained results, we confirmed the presence of a pure fluorite structure of CeO 2 consistent with the ICSD pattern reference of 072155 with space group Fm-3m (225). Subsequent physicochemical characterization by TPR and electron microscopy (SEM-TEM), confirm that cerium oxides could be reduced in two single steps at different temperatures, kinetically detectable and clearly prolonged as well as the obtention of nanostructured solids with a crystallite size between 32-47 nm. According with obtained results, the solids show a high surface area as result of the low calcination temperature. The electrical characterization by impedance spectroscopy (IS), revealed an important concentration of charge carriers in fluorite oxides, mainly in the sample of GDC5, which is a crucial characteristic in advanced materials for SOFC applications. The catalytic studies, conducted on materials at 700 °C under stable reaction conditions, confirm that the methane conversion levels change throughout the series GDC5 → NDC5 → HDC5 → EDC5 → DDC5 → SDC5, which established that the GDC5 solid, exhibits the most promising results. Finally, a stability test was achieved with the GDC5 catalyst under the same reaction conditions established in previous form, for a period of 240 hours of continuous flux, establishing the effectiveness of the proposed method to choice the most promissory material. The results confirmed as the methane conversion vary as function of time and the obtained syngas levels change for potential technological applications.

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Microwave-assisted combustion synthesis of nanocrystalline Sm-doped La 2 Mo 2 O 9 oxide-ion conductors for SOFC application

Cited by 15 publications

References 26 publications

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉

A Monoclinic V1-x-yTixRuyO2 Thin Film with Enhanced Thermal-Sensitive Performance

SYNTHESIS AND CHARACTERIZATION OF CERIUM FLUORITES BASED ON Ce1-xLn xO2-δ SYSTEM (Ln: Nd3+, Sm3+, Eu3+, Gd3+, Dy3+ AND Ho3+)

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Microwave-assisted combustion synthesis of nanocrystalline Sm-doped La 2 Mo 2 O 9 oxide-ion conductors for SOFC application

Cited by 15 publications

References 26 publications

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La2Mo2O9

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La2Mo2O9

A Monoclinic V1-x-yTixRuyO2 Thin Film with Enhanced Thermal-Sensitive Performance

SYNTHESIS AND CHARACTERIZATION OF CERIUM FLUORITES BASED ON Ce1-xLn xO2-&#948; SYSTEM (Ln: Nd3+, Sm3+, Eu3+, Gd3+, Dy3+ AND Ho3+)

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Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉

SYNTHESIS AND CHARACTERIZATION OF CERIUM FLUORITES BASED ON Ce1-xLn xO2-δ SYSTEM (Ln: Nd3+, Sm3+, Eu3+, Gd3+, Dy3+ AND Ho3+)