scholarly journals Synthesis and characterization of CeLaMO2 (M: Sm, Gd, Dy) compounds for solid ceramic electrolytes

2020 ◽  
Vol 14 (4) ◽  
pp. 314-320
Author(s):  
Rabia Kirkgeçit ◽  
Handan Torun
Keyword(s):  
Solid Electrolytes ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Structure Characterization ◽  
Grain Structure ◽  
Pure Ceo2 ◽  
Ceramic Electrolyte ◽  
Ceo2 Sample ◽  
Average Grain Size

In this study, pure CeO2 and Ce0.85La0.10M0.05O2 (M: Sm3+, Gd3+, Dy3+) solid electrolytes were synthesized using the sol-gel method and sintered at 1350?C for 12 h. X-ray diffraction (XRD) was used for crystal structure characterization of the ceramic solid electrolytes. After sintering, all prepared solid electrolytes were indexed to be cubic crystal lattices. The thermal properties of the prepared samples were investigated by thermogravimetric (TG) and differential thermal analysis (DTA) methods. The surface properties of the grain structure of the ceramic solid electrolytes were evaluated by scanning electron microscopy (FE-SEM) confirming the average grain size of about 1 ?m. The electrochemical impedance spectroscopy technique was used to investigate AC electrical properties of prepared solid electrolytes. The conductivity values at 750?C of the Ce0.85La0.10Sm0.05O2, Ce0.85La0.10Gd0.05O2 and Ce0.85La0.10Dy0.05O2 and pure CeO2 were found to be 1.10 ? 10?3 S/cm, 3.05 ? 10?4 S/cm, 8.85 ? 10?4 S/cm and 8.44 ? 10?10 S/cm, respectively. The characterization results showed that the La-Sm co-doped CeO2 sample can be used as a ceramic electrolyte in intermediate temperature solid oxide fuel cells (IT-SOFC).

PREPARATION AND STRUCTURE CHARACTERIZATION OF BiFeO3-SrBi2Nb2O9 THIN FILMS ON SILICON BY SOL-GEL PROCESSING

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4455-4459
Author(s):  
HAOSHUANG GU ◽  
WANQIANG CAO ◽  
JUNMIN XUE ◽  
JOHN WANG
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Precursor Solution ◽  
Monomethyl Ether ◽  
Structure Characterization ◽  
Layered Perovskite ◽  
Heat Treated ◽  
Average Grain Size ◽  
Gel Processing

A new system 0.1 BiFeO 3-0.9 SrBi 2 Nb 2 O 9 thin films have been successfully prepared by an ethanolamine-modified sol-gel technique. The precursor solution was synthesized from compounds, Bi(NO 3)3· 5H 2 O , Sr(NO 3)2, Fe(NO 3)3· 9H 2 O and Nb(OC 2 H 5)5 in solution ethylene glycol monomethyl ether. The thin films were deposited on Si single crystal by spinning coating, and heat-treated at temperatures ranging from 400°C to 700°C. Crystallization of thin films occurred at about 500 ~ 600°C and the films exhibit a pure phase of layered perovskite ferroelectric structure. The grain of films is well distributed and the average grain size of the film is about 100nm.

Synthesis and Characterization of Sm-Ho-CeO2 Compounds Produced by Different Synthesis Methods

2021 ◽  
Vol 43 (3) ◽  
pp. 314-314
Author(s):  
Ahmet Hamdi BAKIR and Handan ZL TORUN Ahmet Hamdi BAKIR and Handan ZL TORUN
Keyword(s):  
Room Temperature ◽  
Sol Gel ◽  
Stable Phase ◽  
Total Conductivity ◽  
Synthesis Methods ◽  
X Ray ◽  
Ceramic Electrolyte ◽  
Cubic Phases ◽  
Hydrothermal Methods

The most important part of a solid oxide fuel cell is the ceramic electrolyte. In this study, cerium oxide (CeO2) was used as the ceramic electrolyte, and different dopant types were used to increase total conductivity. In this study, the most commonly used Sm, and the less frequently used Ho elements were doped simultaneously. As a result, the effect of dope and different synthesis methods on electrolyte properties was evaluated. Three rates were studied with the total amount of Sm-Ho being 20%. The effect of the dopant types on conductivity with critical radius effect was investigated. These dope types were placed in a CeO2 crystal lattice by using the sol-gel and hydrothermal methods. After synthesis, the stable phase was obtained at room temperature. X-ray powder diffraction (XRD) was used for phase determination. The thermogravimetry (TG) determined mass change. Scanning electron microscopy (SEM) was used in the analysis of surface morphology. Total conductivity measurements were measured by the four-probe dc method. After synthesis processes, cubic compounds were obtained. The total conductivity values of the cubic phases samples obtained by two different synthesis methods were compared. The highest conductivity was observed in the sol-gel compounds. The highest electrical conductivity Ce0.80Sm0.10Ho0.10O2 system sol- gel; 6.92x10-3(Ωcm)1- at 655 oC. It was found that the compound obtained as a result of the evaluations could be used ceramic electrolyte application.

scholarly journals EFEK DOPANT TERHADAP STRUKTUR DAN KARAKTER DARI FOTOKATALIS POWDER TITANIA

2015 ◽  
Vol 2 (1) ◽  
pp. 81
Author(s):  
Yetria Rilda ◽  
Abdi Dharma ◽  
Syukri Arief ◽  
Admin Alif
Keyword(s):  
Crystal Structure ◽  
Crystal Size ◽  
Sol Gel ◽  
Transformation Process ◽  
Structure Characterization ◽  
Minimal Inhibition Concentration ◽  
Rutile Structure ◽  
Anatase Structure ◽  
Bacteria Growth

 ABSTRACT The structure and characterization of the titania (M-TiO2) can be modified by metal doped and calcinations temperatures variation by sol-gel method. Characterization of gel and M-TiO2 powder realized by FT-IR, TGA, XRD, Photo Optic and SEM. Titania has two crystal structures such as anatase and rutile. Anatase structures shown higher photocatalytic properties than rutile. The crystal structure was characterized to JCPS reference no. 21-1272, 2Ө : 25.3° identically as anatase structure and 2Ө : 27.3° as rutile. Structure modification is depend on calcinations temperature change. At 400°C the anatase structure was formed. The anatase intensity was increased at 500°C and at 600°C anatase transportation to rutile was found and anatase mixture was obtained. Several types of dopant can inhibit anatase to rutil transformation process at temperature ≥ 600°C. Park et al.,[1] reported that calcinations temperature and valence ion dopant influence the crystal size. Based on Scherrer’s equation the crystal size can be calculated by using the XRD  data. The crystal size of maximum intensity which was identified as anatase structure at 500°C as following Fe-TiO2 10.6 nm, MoTiO2 16.8 nm.  M-TiO2 character through inhibition of E. Coli bacteria growth was great infulenced by particle size and dopant ion type. This character shown by MIC value (Minimal Inhibition Concentration)) of each Fe, Mo-TiO2 between 0.35 – 0.45%. Keywords : crystal structure, characterization, titania, sol-gel

Effect of Copper Concentration on Characterization of Cu2Zn0.8Cd0.2SnS4 Pentrary Alloy Nanostructures

2015 ◽  
Vol 754-755 ◽  
pp. 1115-1119 ◽  
Author(s):  
A.S. Ibraheam ◽  
Y. Al-Douri ◽  
Uda Hashim
Keyword(s):  
Spin Coating ◽  
Copper Concentration ◽  
Sol Gel ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force ◽  
Average Grain Size ◽  
Alloy Nanostructures ◽  
Effect Of Copper

Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructure were prepared and deposited on glass substrates with different copper concentrations ( 0.3, 0.5, 0.7 and 0.9 mol/L ) using Sol gel – spin coating method.morphological and analytical studies were investigated by Field Emission-Scanning Electron Microscope (FE-SEM), atomic force microscopy (AFM). It is found that the average grain size of Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructure is 51.92 to 76.43 nm for the thin films prepared at 0.3, 0.5, 0.7 and 0.9 mol/L respectively .

scholarly journals Enhanced Corrosion Protection of Epoxy/ZnO-NiO Nanocomposite Coatings on Steel

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 783 ◽  
Author(s):  
Muna Ibrahim ◽  
Karthik Kannan ◽  
Hemalatha Parangusan ◽  
Shady Eldeib ◽  
Omar Shehata ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Morphological Characterization ◽  
Coated Steel ◽  
X Ray ◽  
Edax Analysis

ZnO-NiO nanocomposite with epoxy coating on mild steel has been fabricated by the sol–gel assisted method. The synthesized sample was used to study corrosion protection. The analysis was performed by electrochemical impedance spectroscopy in 3.5% NaCl solution. The structural and morphological characterization of the metal oxide nanocomposite was carried out using XRD and SEM with Energy Dispersive Absorption X-ray (EDAX) analysis. XRD reveals the ZnO-NiO (hexagonal and cubic) structure with an average ZnO-NiO crystallite size of 26 nm. SEM/EDAX analysis of the ZnO-NiO nanocomposite confirms that the chemical composition of the samples consists of: Zn (8.96 ± 0.11 wt.%), Ni (10.53 ± 0.19 wt.%) and O (80.51 ± 3.12 wt.%). Electrochemical Impedance Spectroscopy (EIS) authenticated that the corrosion resistance has improved for the nanocomposites of ZnO-NiO coated along with epoxy on steel in comparison to that of the pure epoxy-coated steel.

LOCAL STRUCTURE CHARACTERIZATION OF GADOLINIUM DOPED AMORPHOUS AND CRYSTALLINE ALUMINA

2001 ◽  
Vol 15 (12n13) ◽  
pp. 375-384 ◽  
Author(s):  
S. SIMON
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Local Structure ◽  
Sol Gel ◽  
Structure Characterization ◽  
Epr Spectra ◽  
Paramagnetic Resonance ◽  
Amorphous Alumina ◽  
Electron Paramagnetic ◽  
Crystalline Alumina

The evolution of local structure during the transition from amorphous to crystalline states of gadolinium doped alumina is characterized by electron paramagnetic resonance (EPR). The EPR spectra of samples belonging to the (1 - x) Al 2 O 3x Gd 2 O 3 system, where x = 0.002, 0.01, 0.05 and 0.1, show that the gadolinium ions are relatively uniformly distributed in amorphous alumina granules prepared by sol–gel methods. First, gadolinium doped α-alumina appears on the surface of the γ-alumina granules where there are low coordinated (N < 6) gadolinium species. The transition from γ- to α-alumina is postponed by the presence of high coordinated gadolinium (N < 6) ions inside of γ-alumina granules.

Hybrid Organic-Inorganic Electrode-Membranes Based on Organo-Polysiloxane/Macrocycle Systems

1998 ◽  
Vol 519 ◽  
Author(s):  
A. Jiménez-Morales ◽  
J.C. Galvan ◽  
P. Aránda ◽  
E. Ruiz-Hitzky
Keyword(s):  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Ion Selectivity ◽  
Sol Gel ◽  
Solution Concentration ◽  
Complexing Agents ◽  
Cavity Size ◽  
Sol Gel Process ◽  
Porous Supports

AbstractSpecific complexing agents for alkaline ions such as some crown-ethers of different intramolecular cavity size (12-crown-4, 15-crown-5 and 18-crown-6) are incorporated into a organo-polyorganosiloxane network generated via the sol-gel process. The resulting xerogels embody macrocycle compounds with different ion-selectivity. These xerogels are deposited onto porous supports (borosilicate, polyacrylonitrile,…) to obtain new composite electrode- membranes. The electrochemical characterization of the membranes and the electrode- membranes by electrochemical impedance spectroscopy (EIS) shows information about the reversible behavior and the ion resistance of the membranes, which are a function of both, nature and content of the entrapped macrocycle as well as the salt solution concentration. The electrochemical response of these systems acting as electrode-membranes shows their sensitivity towards different metal ions at variable concentrations.

Preparation and characterization of highly sodium ion conducting Na3PS4–Na4SiS4 solid electrolytes

RSC Advances ◽  
2014 ◽  
Vol 4 (33) ◽  
pp. 17120-17123 ◽  
Author(s):  
Naoto Tanibata ◽  
Kousuke Noi ◽  
Akitoshi Hayashi ◽  
Masahiro Tatsumisago
Keyword(s):  
Glass Ceramic ◽  
Solid Electrolytes ◽  
Ion Conductivity ◽  
Sodium Ion ◽  
Ceramic Electrolyte ◽  
Ion Conducting

Glass–ceramic electrolyte in the system Na3PS4–Na4SiS4 exhibits a high Na+ ion conductivity of 7.4 × 10−4 S cm−1 at 25 °C.

Characterization of Nanostructured Electrodeposited NiCo Samples by use of Electron Backscatter Diffraction (EBSD)

2005 ◽  
Vol 880 ◽  
Author(s):  
Alice Bastos ◽  
Dierk Raabe ◽  
Stefan Zaefferer ◽  
Christopher Schuh
Keyword(s):  
Grain Size ◽  
Cross Sections ◽  
Electron Backscatter Diffraction ◽  
Growth Direction ◽  
Grain Structure ◽  
Local Texture ◽  
Average Grain Size ◽  
Electron Backscatter ◽  
Backscatter Diffraction

AbstractA Cobalt-20wt.% Nickel polycrystal produced by electrodeposition has been investigated in planar and cross sections using a high resolution scanning electron microscope. The local texture, grain size, amount of phase and grain boundaries, were characterized by Electron Backscatter Diffraction (EBSD). The average grain size perpendicular to the grain growth direction was 400 nm. Parallel to it, a pronounced bimodal grain structure was observed with grains reaching more than 10 μm and grains of approximately 800 nm diameter.

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