Photoluminescence properties of sesquioxide doped ceria synthesized by modified sol–gel route

Rath, Manas Kumar; Acharya, Susant Kumar; Kim, Bok‐Hee; Lee, Kitae; Ahn, Byung-Guk

doi:10.1016/j.matlet.2011.01.004

Cited by 16 publications

(4 citation statements)

References 20 publications

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“…The weak emission band observed at 521 nm could be due to the f–f transition, i.e., 4 G 5/2 → 6 H n /2 , which is significantly enhanced by the addition of dopant ions in the cerium host lattice. This emission band is not due to the characteristic emission of the doping ions, but it may be originated from the oxygen vacancy introduced in the cerium lattice to compensate the negative charges linked with the doping ions. , The high PL intensity implies the high crystalline nature of the solid electrolytes with defects.…”

Section: Resultsmentioning

confidence: 99%

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Superior Oxide Ion Conductivity of Novel Acceptor Doped Cerium Oxide Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cell Applications

Kanagaraj¹,

Theerthagiri

Madhavan

et al. 2016

J. Phys. Chem. C

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Novel compositions of Nd 3+ and Dy 3+ codoped c e r i u m o x i d e a c c o r d i n g t o t h e s y s t e m o f Ce 0.8 Nd x−y Dy y O 2−{x−y/2+y} (x = 0.2; y = 0.04, 0.08, 0.1) have been synthesized by a simple sol−gel method and studied as electrolytes for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Thermal, microstructural, optical, and electrical properties have been enhanced to different extents by the addition of Nd 3+ and Dy 3+ ions in cerium lattice, in particularly Dy 3+ ions because of their low ionic radius mismatch. Thermogravimetric/differential scanning calorimetric (TG/ DSC) analysis exhibited a small weight loss and high thermal stability in the intermediate temperature range (400−800 °C). The addition of Dy 3+ ions stabilized the cubic fluorite structure, which is confirmed from X-ray diffraction (XRD) studies. Lattice parameter expansion and contraction have been observed on account of their ionic radii trend. The formation of cubic fluorite structure has been confirmed by high-resolution transmission electron microscopy (HRTEM) along with XRD studies. Addition of Dy 3+ ions acts as an oxygen vacancy generator that increases the oxygen vacancy concentration and efficient conversion of Ce 4+ to Ce 3+ , which are affirmed with optical studies. Complex impedance analysis was performed at the temperature range from 300 to 600 °C in air atmosphere. Compositions of the system Ce 0.8 Nd x−y Dy y O 2−{x−y/2+y} (x = 0.2; y = 0.04, 0.08, 0.1) offer competitive oxide ion conductivities in the intermediate temperature range. Ce 0.8 Nd 0.1 Dy 0.1 O 1.85 has been found to be an optimum composition with superior oxide ion conductivity of 2.2 × 10 −2 S/cm at 600 °C and activation energy of 0.83 eV. Oxide ion conductivity is largely enhanced by the introduction of Dy 3+ at intermediate temperature due to the low ionic radius mismatch, concentration of surface oxygen vacancies, and stabilization of cubic fluorite structure. Hence, these results suggest that the composition of Ce 0.8 Nd 0.1 Dy 0.1 O 1.85 can be a potential electrolyte for IT-SOFC applications.

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Section: Resultsmentioning

confidence: 99%

“…This emission band is not due to the characteristic emission of the doping ions, but it may be originated from the oxygen vacancy introduced in the cerium lattice to compensate the negative charges linked with the doping ions. 34,35 The high PL intensity implies the high crystalline nature of the solid electrolytes with defects.…”

Section: Methodsmentioning

confidence: 99%

Superior Oxide Ion Conductivity of Novel Acceptor Doped Cerium Oxide Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cell Applications

Kanagaraj¹,

Theerthagiri

Madhavan

et al. 2016

J. Phys. Chem. C

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“…Sample without Sm 2 O 3 has more defects. With the increase of Sm 2 O 3 content, the number of defects decreases due to the self-compensation mechanism [11]. Hence the concentration of dipoles decreases, which weakens the dependence of dielectric constant on frequency.…”

Section: Methodsmentioning

confidence: 99%

High dielectric constant and good thermal stability from −55 °C to 450 °C in BaTiO3-based ceramics

Zhang

2015

Materials Letters

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“…Numerous studies have shown that nanomaterials exhibit functional and structural properties significantly different from those observed for their microcrystalline counterparts. Among others, in recent years, cerium dioxide (ceria, CeO 2 ) and ceria-based nanomaterials have attracted much attention because they possess many attractive properties which make them highly promising for a wide range of applications such as catalysts, oxygen sensors, solid oxide fuel cells as well as parts of optical, microelectronic and optoelectronic devices [1][2][3][4][5][6][7]. The cationic valence balance, Ce 4+ /Ce 3+ , is known to significantly influence functional properties of ceria [8].…”

Section: Introductionmentioning

confidence: 99%

Nanostructure and magnetic anomaly of mechanosynthesized Ce1-xYxO2-δ (x ≤ 0.3) solid solutions

Fábian

Menzel

Yermakov

et al. 2021

Journal of Physics and Chemistry of Solids

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Photoluminescence properties of sesquioxide doped ceria synthesized by modified sol–gel route

Cited by 16 publications

References 20 publications

Superior Oxide Ion Conductivity of Novel Acceptor Doped Cerium Oxide Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cell Applications

Superior Oxide Ion Conductivity of Novel Acceptor Doped Cerium Oxide Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cell Applications

High dielectric constant and good thermal stability from −55 °C to 450 °C in BaTiO3-based ceramics

Nanostructure and magnetic anomaly of mechanosynthesized Ce1-xYxO2-δ (x ≤ 0.3) solid solutions

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