Lattice Parameters of Gd-Doped Ceria Electrolytes

2005 ◽  
Vol 494 ◽  
pp. 175-180 ◽  
Author(s):  
B. Matović ◽  
Snezana Bošković ◽  
Ljiljana Živković ◽  
M.D. Vlajić ◽  
Vladimir D. Krstić
Keyword(s):  
Solid Solutions ◽  
Lattice Parameter ◽  
Lattice Parameters ◽  
Doped Ceria ◽  
Ceria Solid Solutions ◽  
Fluorite Type ◽  
Parameter Versus ◽  
Average Size ◽  
20 Nm ◽  
Type Crystal

This paper deals with Gd-doped ceria solid solutions: Ce1−XGdXO2−d with "x" ranging from 0 to 0.2. Four different powders were synthesized by modified glycine nitrate procedure with very precise stoichiometry according to tailored composition. The method was modified by decreasing glycine/nitrate ratio to 0.5. All obtained solid solutions exhibit a fluorite-type crystal structure with composition dependent lattice parameters. The variation of the lattice parameter was studied and correlated with the equation describing the ion-packing model. It has been found that the change of lattice parameter versus Gd concentration obeys Vegard's rule very well. Results also show that all powders are nanometric in size. The average size of Ce1−XGdXO2−d particles is about 20 nm.

scholarly journals Influence of mg doping on structural, optical and photocatalytic performances of ceria nanopowders

2017 ◽  
Vol 11 (4) ◽  
pp. 304-310
Author(s):  
Branko Matovic ◽  
Jelena Lukovic ◽  
Bojan Stojadinovic ◽  
Sonja Askrabic ◽  
Aleksandra Zarubica ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Oxygen Vacancies ◽  
Uv Light ◽  
Doped Ceria ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ceria Solid Solutions ◽  
Fluorite Type ◽  
Photocatalytic Performances ◽  
Mg Doped

Nanosized Mg-doped ceria powders were obtained by self-propagating room temperature reaction without using surfactants or templates. X-ray diffraction analysis and field emission scanning microscopy results showed that the doped samples are solid solutions with fluorite-type structure and spherical morphology. Raman spectra revealed an increase in the amount of oxygen vacancies with the increase of Mg concentration. This increasing results in a narrowing of the bandgap of CeO2. The photocatalytic performances of the Mg-doped ceria solid solutions were evaluated by decomposing an organic dye, crystal violet under UV irradiation. The Mg-doped ceria solid solutions exhibit significantly better photocatalytic activity than the pure CeO2 and commercial TiO2. The higher first rate constant of the Mg-doped samples demonstrated that they are much more efficient than TiO2 and CeO2 under UV light. Mg2+ dopant ions and oxygen vacancies play a significant role in the enhancement of photocatalytic performances of the Mg-doped ceria.

scholarly journals Crystal structure analysis of Nd-doped ceria solid solutions

2008 ◽  
Vol 40 (1) ◽  
pp. 63-68 ◽  
Author(s):  
B. Matovic ◽  
J. Dukic ◽  
A. Devecerski ◽  
S. Boskovic ◽  
M. Ninic ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid Solutions ◽  
Structural Information ◽  
Crystal Structure Analysis ◽  
Ion Concentration ◽  
Doped Ceria ◽  
Cell Parameters ◽  
Ceria Solid Solutions ◽  
Fluorite Type ◽  
Powder Particles

This paper deals with Nd-doped ceria solid solutions: Ce1-xNdxO2-d with "x" ranging from 0 to 0.25. Six different powders were synthesized by applying the method based on selfpropagating room temperature reaction (SPRT) between metallic nitrates and sodium hydroxide. The method is known to assure very precise stoichiometry of the final product in comparison with a tailored composition. Rietveld refinement was employed to get structural information on the synthesized powder. An increase of Nd ion concentration increases the unit cell parameters and average bond distances. We have shown that all obtained powders were solid solutions with a fluorite-type crystal structure and all powder particles were of nanometric size (about 3 nm).

scholarly journals Crystal structure analysis of Nd-doped ceria solid solutions

2008 ◽  
Vol 40 (1) ◽  
pp. 63-68
Author(s):  
B. Matovic ◽  
J. Dukic ◽  
A. Devecerski ◽  
S. Boskovic ◽  
M. Ninic ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid Solutions ◽  
Structural Information ◽  
Crystal Structure Analysis ◽  
Ion Concentration ◽  
Doped Ceria ◽  
Cell Parameters ◽  
Ceria Solid Solutions ◽  
Fluorite Type ◽  
Powder Particles

This paper deals with Nd-doped ceria solid solutions: Ce1-xNdxO2-d with "x" ranging from 0 to 0.25. Six different powders were synthesized by applying the method based on selfpropagating room temperature reaction (SPRT) between metallic nitrates and sodium hydroxide. The method is known to assure very precise stoichiometry of the final product in comparison with a tailored composition. Rietveld refinement was employed to get structural information on the synthesized powder. An increase of Nd ion concentration increases the unit cell parameters and average bond distances. We have shown that all obtained powders were solid solutions with a fluorite-type crystal structure and all powder particles were of nanometric size (about 3 nm).

Elaboration and characterization of europium doped ceria solid solutions

2005 ◽  
Vol 123 ◽  
pp. 35-39
Author(s):  
L. Aneflous ◽  
S. Villain ◽  
J. R. Gavarri ◽  
J. Musso ◽  
H. Benyaich ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Doped Ceria ◽  
Ceria Solid Solutions

scholarly journals Studies on Structural and Morphological Properties of Multidoped Ceria Ce0.8Nd0.0025Sm0.0025Gd0.005Dy0.095Y0.095O2-δ(x=0.2) as Solid Solutions

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Marija Stojmenović ◽  
Maja C. Pagnacco ◽  
Vladimir Dodevski ◽  
Jelena Gulicovski ◽  
Milan Žunić ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Solid Solutions ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism ◽  
Fluorite Structure ◽  
Lattice Parameter ◽  
Morphological Properties ◽  
Fluorite Type ◽  
Potential Improvement

The nanopowdery solid solutions of multidoped ceria Ce0.8Nd0.0025Sm0.0025Gd0.005Dy0.095Y0.095O2-δ(x=0.2) with the fluorite type crystal structure of CeO2were synthesized for the first time. Two synthesis procedures were applied: the modified glycine-nitrate procedure (MGNP method) and room temperature self-propagating reaction (SPRT method). All nanopowders were characterized by XRPD analysis, Raman spectroscopy, low temperature nitrogen physisorption, TEM, and SEM methods. According to the XRPD and Raman spectroscopy results, single phase solid solutions of fluorite structure were evidenced regardless of the number of dopants and synthesis procedure. Both XRPD and TEM were analyses evidenced nanometer particle dimensions. The SPRT method results in obtaining sample with higher specific surface area, smaller crystallite and particles sizes, and the same values of the lattice parameter in comparison to pure CeO2. Raman spectroscopy was confirmed to the oxygen vacancies introduced into the ceria lattice when Ce4+ions were replaced with cations (dopants) of lower valence state (3+), which may indicate the potential improvement of ionic conductivity. Additionally, the presence of oxygen vacancies in the lattice ceria, as well as very developed grain boundaries, gives a new possibility for potential application of obtained nanopowders in the area of room temperature ferromagnetism as spintronics.

Sintering Analysis of Undoped and Cobalt Oxide Doped Ceria Solid Solutions

2005 ◽  
Vol 88 (11) ◽  
pp. 3013-3019 ◽  
Author(s):  
Eva Jud ◽  
Christoph B. Huwiler ◽  
Ludwig J. Gauckler
Keyword(s):  
Cobalt Oxide ◽  
Solid Solutions ◽  
Doped Ceria ◽  
Ceria Solid Solutions

LATTICE PARAMETERS OF MELILITE SOLID SOLUTIONS AND A RECONNAISSANCE OF PHASE RELATIONS IN THE SYSTEM Ca2Al2SiO7 (GEHLENITE) – Ca2MgSi2O7 (AKERMANITE) – NaCaAlSi2O7 (SODA MELILITE) AT 1 000 kg/cm2 WATER VAPOR PRESSURE

1965 ◽  
Vol 2 (6) ◽  
pp. 596-621 ◽  
Author(s):  
A. D. Edgar
Keyword(s):  
Solid Solutions ◽  
Water Vapor Pressure ◽  
Lattice Parameter ◽  
Lattice Parameters ◽  
Phase Relations ◽  
Ray Method ◽  
Subsolidus Phase ◽  
X Ray ◽  
Complete Solid Solution ◽  
Temperature Lattice

The extent of melilite solid solutions has been determined for the systems gehlenite–soda melilite, akermanite–soda melilite, and gehlenite–akermanite–soda melilite at 800 °C and 1 000 kg/cm2[Formula: see text] Approximately 50 weight % NaCaAlSi2O7 will form melilite solid solutions with both gehlenite and akermanite but the extent of complete solid solutions in the gehlenite–akermanite–soda melilite system is very limited at this temperature. Lattice parameter determinations of melilite solid solutions indicate that there is a small but significant change in both a and c parameters with increasing soda melilite in the gehlenite–soda melilite system. In the gehlenite–akermanite–soda melilite system, although the range of complete solid solution is very limited, melilites form more than 90% of the products in most compositions and their lattice parameters can be correlated approximately with their bulk compositions, A rapid X-ray method has been developed to determine the approximate compositions of melilites in this system. Comparison is made between the synthetic samples and natural melilites.A reconnaissance of subsolidus phase relations indicates that phase relations are very complex and that only over a very small compositional range can these systems be considered binary or ternary. These studies also indicate that the relations reported by Nurse and Midgley in 1953 should probably be modified. Although the composition NaCaAlSi2O7 does not synthesize only a melilite under the conditions used in this study, it is believed that this is the correct composition of the sodium-bearing end-member.

Ionic conductivity of high-purity Gd-doped ceria solid solutions

2006 ◽  
Vol 41 (3) ◽  
pp. 563-568 ◽  
Author(s):  
T.S. Zhang ◽  
J. Ma ◽  
H. Cheng ◽  
S.H. Chan
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions ◽  
High Purity ◽  
Doped Ceria ◽  
Ceria Solid Solutions

scholarly journals Synthesis and Ionic Conductivity of Mechanically Synthesized Yttrium-doped Ceria Solid Solutions

2011 ◽  
Vol 11 (8) ◽  
pp. 1285-1290 ◽  
Author(s):  
O.P. Shing ◽  
T.Y. Ping ◽  
Taufiq-Yap Y.Hin ◽  
Z. Zainal
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions ◽  
Doped Ceria ◽  
Ceria Solid Solutions
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