Combustion synthesis of gadolinia doped ceria powder

Mahata, T.; Das, G. P.; Mishra, R.; Sharma, B.P.

doi:10.1016/j.jallcom.2004.07.085

Cited by 88 publications

(41 citation statements)

References 16 publications

(21 reference statements)

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“…1). [8,9,10,11,14,16] Such variability is a strong indication that equilibrium (Eq. 1) affects the unit cell dimensions, even at room temperature.…”

Section: Motivationmentioning

confidence: 99%

Influence of Point‐Defect Reaction Kinetics on the Lattice Parameter of Ce_0.8Gd_0.2O_1.9

Kossoy

Feldman

Korobko

et al. 2009

Adv Funct Materials

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The kinetics of point‐defect association/dissociation reactions in Ce0.8Gd0.2O1.9 and their influence on the crystal lattice parameter are investigated by monitoring thermally induced stress and strain in substrate‐ and self‐supported thin films. It is found that, in the temperature range of 100–180 °C, the lattice parameter of the substrate‐supported films and the lateral dimensions of annealed, self‐supported films both exhibit a hysteretic behavior consistent with dissociation/association of oxygen vacancy–aliovalent dopant complexes. This leads to strong deviation from linear elastic behavior, denoted in the authors' previous work as the “chemical strain” effect. At room temperature, the equilibrium state of the point defects is reached within a few months. During this period, the lattice parameter of the substrate‐supported films spontaneously increases, while the self‐supported films are observed to transform from the flat to the buckled state, indicating that formation of the dopant–vacancy complex is associated with a volume increase. The unexpectedly slow kinetics of establishing the defect equilibrium at room temperature can explain the fact that, depending on the sample history, the “observable” lattice parameters of Ce0.8Gd0.2O1.9, as reported in the literature, may differ from one another by a few tenths of a percent. These findings strongly suggest that the lattice parameter of the materials with a large concentration of interacting point defects is a strong function of time and material preparation route.

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“…1). [8,9,10,11,14,16] Such variability is a strong indication that equilibrium (Eq. 1) affects the unit cell dimensions, even at room temperature.…”

Section: Motivationmentioning

confidence: 99%

Influence of Point‐Defect Reaction Kinetics on the Lattice Parameter of Ce_0.8Gd_0.2O_1.9

Kossoy

Feldman

Korobko

et al. 2009

Adv Funct Materials

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“…Castillo and Munz found that as the CeO2 crystals start growing, the incorporation of dopant cations into the CeO2 solid lattice retarded crystal growth. 26) Mahata et al found that specific surface area of ceria particles prepared by combustion method increased with increase in gadolinium content due to the lowering exothermicity. 26) In this work, nano-sized ceria particles with various doping concentrations of gadolinium were prepared by ultrasonic spray pyrolysis process.…”

Section: )-27)mentioning

confidence: 99%

“…26) Mahata et al found that specific surface area of ceria particles prepared by combustion method increased with increase in gadolinium content due to the lowering exothermicity. 26) In this work, nano-sized ceria particles with various doping concentrations of gadolinium were prepared by ultrasonic spray pyrolysis process. The effects of doping concentration of gadolinium on the mean size and morphology of the ceria particles obtained after calcination were investigated.…”

Section: )-27)mentioning

confidence: 99%

Microstructure and electrical properties of nano-sized Ce1-xGdxO2 (0 .LEQ. x .LEQ. 0.2) particles prepared by spray pyrolysis

Jung

Lee

Han

et al. 2008

J. Ceram. Soc. Japan

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“…Especially, cubic Gd 2 O 3 :Eu 3+ has been widely used in X-ray scintillator material, high definition projection television and flat panel display applications [12]. Gd 2 O 3 :Eu 3+ phosphors have been extensively synthesized in different methods such as sol gel [13], co-precipitation [14], combustion [15], chemical vapor deposition [16], solid state reaction [17], spray pyrolysis [18], etc. Among these methods, the hydrothermal method has been used frequently due to its simplicity, highly uniformity and reproducibility of the product, high efficiency and low cost [19].…”

Section: Introductionmentioning

confidence: 99%

Thermo and photoluminescence properties of Eu3+ activated hexagonal, monoclinic and cubic gadolinium oxide nanorods

Dhananjaya

Nagabhushana

et al. 2011

Physica B: Condensed Matter

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a b s t r a c tDifferent phases of Eu 3 + activated gadolinium oxide (Gd (OH) 3 , GdOOH and Gd 2 O 3 ) nanorods have been prepared by the hydrothermal method with and without cityl trimethyl ammonium bromide (CTAB) surfactant. Cubic Gd 2 O 3 :Eu (8 mol%) red phosphor has been prepared by the dehydration of corresponding hydroxide Gd(OH) 3 :Eu after calcinations at 350 and 600 1C for 3 h, respectively. When Eu 3 + ions were introduced into Gd(OH) 3 , lattice sites which replace the original Gd 3 + ions, a strong red emission centered at 613 nm has been observed upon UV illumination, due to the intrinsic Eu 3 + transition between 5 D 0 and 7 F configurations. Thermoluminescence glow curves of Gd (OH) 3 : Eu and Gd 2 O 3 :Eu phosphors have been recorded by irradiating with gamma source ( 60 CO) in the dose range 10-60 Gy at a heating rate of 6.7 1C sec À 1 . Well resolved glow peaks in the range 42-45, 67-76, 95-103 and 102-125 1C were observed.When g-irradiation dose increased to 40 Gy, the glow peaks were reduced and with increase in g-dose (50 and 60 Gy) results the shift in first two glow peak temperatures at about 20 1C and a new shouldered peak at 86 1C was observed. It is observed that there is a shift in glow peak temperatures and variation in intensity, which is mainly attributed to different phases of gadolinium oxide. The trapping parameters namely activation energy (E), order of kinetics (b) and frequency factor were calculated using peak shape and the results are discussed.

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Combustion synthesis of gadolinia doped ceria powder

Cited by 88 publications

References 16 publications

Influence of Point‐Defect Reaction Kinetics on the Lattice Parameter of Ce_0.8Gd_0.2O_1.9

Influence of Point‐Defect Reaction Kinetics on the Lattice Parameter of Ce_0.8Gd_0.2O_1.9

Microstructure and electrical properties of nano-sized Ce1-xGdxO2 (0 .LEQ. x .LEQ. 0.2) particles prepared by spray pyrolysis

Thermo and photoluminescence properties of Eu3+ activated hexagonal, monoclinic and cubic gadolinium oxide nanorods

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Combustion synthesis of gadolinia doped ceria powder

Cited by 88 publications

References 16 publications

Influence of Point‐Defect Reaction Kinetics on the Lattice Parameter of Ce0.8Gd0.2O1.9

Influence of Point‐Defect Reaction Kinetics on the Lattice Parameter of Ce0.8Gd0.2O1.9

Microstructure and electrical properties of nano-sized Ce1-xGdxO2 (0 .LEQ. x .LEQ. 0.2) particles prepared by spray pyrolysis

Thermo and photoluminescence properties of Eu3+ activated hexagonal, monoclinic and cubic gadolinium oxide nanorods

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Influence of Point‐Defect Reaction Kinetics on the Lattice Parameter of Ce_0.8Gd_0.2O_1.9

Influence of Point‐Defect Reaction Kinetics on the Lattice Parameter of Ce_0.8Gd_0.2O_1.9