Preparation and Properties of Yttrium Doped Barium Cerate (BaCe1-xYxO3-δ)

2015 ◽  
Vol 1098 ◽  
pp. 69-74
Author(s):  
Eduardo R. Magdaluyo ◽  
Jomyr E. Gapasin
Keyword(s):  
Ceramic Material ◽  
Proton Conductivity ◽  
Pechini Method ◽  
Sol Gel ◽  
Secondary Phase ◽  
Processing Parameters ◽  
Homogeneous Distribution ◽  
Barium Cerate ◽  
X Ray Diffraction ◽  
Doped Barium Cerate

Yttrium doped barium cerate is considered a promising electrolyte material for solid oxide fuel cell applications due to its excellent proton conductivity. The proton conductivity characteristics of the ceramic material can be influenced by the different synthesis processing parameters. This study aimed to obtain yttrium doped barium cerate BaCe1-xYxO3-δ (x = 0.15, 0.20) using a sol-gel modified Pechini method. The phase formation and surface morphology of the yttrium doped barium cerate were investigated using x-ray diffraction and scanning electron microscopy. The thermal decomposition of the calcined ceramic material was examined using thermogravimetric analysis. Diffraction analysis confirmed the formation of perovskite crystalline structure with the presence of secondary phase yttrium doped ceria. Larger grain size with homogeneous distribution and coalescence was observed in the sintered BaCe0.80Y0.20O3-δ.

Magnetic Properties of Bulk Zn0.95-XMnXFe0.05O2 Prepared by Sol-Gel Method and Subsequent Hot Pressing

2011 ◽  
Vol 268-270 ◽  
pp. 356-359 ◽  
Author(s):  
Wen Song Lin ◽  
C. H. Wen ◽  
Liang He
Keyword(s):  
Magnetic Properties ◽  
Photoelectron Spectroscopy ◽  
Raw Materials ◽  
Sol Gel ◽  
Secondary Phase ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Doped Zno

Mn, Fe doped ZnO powders (Zn0.95-xMnxFe0.05O2, x≤0.05) were synthesized by an ameliorated sol-gel method, using Zn(CH3COO)2, Mn(CH3COO)2and FeCl2as the raw materials, with the addition of vitamin C as a kind of chemical reducer. The resulting powder was subsequently compacted under pressure of 10 MPa at the temperature of 873K in vacuum. The crystal structure and magnetic properties of Zn0.95-xMnxFe0.05O2powder and bulk samples have been investigated by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). X-ray photoelectron spectroscopy (XPS) was used to study chemical valence of manganese, iron and zinc in the samples. The x-ray diffraction (XRD) results showed that Zn0.95-xMnxFe0.05O (x≤0.05) samples were single phase with the ZnO-like wurtzite structure. No secondary phase was found in the XRD spectrum. X-ray photoelectron spectroscopy (XPS) showed that Fe and Mn existed in Zn0.95-xMnxFe0.05O2samples in Fe2+and Mn2+states. The results of VSM experiment proved the room temperature ferromagnetic properties (RTFP) of Mn, Fe co-doped ZnO samples.

HIGHLY HOMOGENEOUS NITROGEN DOPED TITANIA NANOMATERIALS: SYNTHESIS AND CHARACTERIZATION

2016 ◽  
Vol 78 (6-12) ◽  
Author(s):  
Nurul Diyana Zainal ◽  
Hadi Nur ◽  
Siew Ling Lee
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Ammonium Hydroxide ◽  
Homogeneous Distribution ◽  
X Ray Diffraction ◽  
Nitrogen Doped ◽  
Mapping Analysis ◽  
N Doping ◽  
Nanomaterials Synthesis ◽  
Doped Titania

A series of nitrogen doped titania nanomaterials were synthesized via sol-gel method by using tetraethyl ammonium hydroxide as N source. Doping of N into TiO2 was confirmed via X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR) analyses. Mixture of anatase and rutile phases appeared in the unmodified TiO2 which was calcined at 773 K. The addition of N to TiO2 matrix led to formation of single phase of anatase. It has been demonstrated thatTiO2 and all the N-doped TiO2 materials were in nanoscale ranging 15.91 – 20.82 nm. Change in surface morphology after N doping was detected by field emission scanning electron microscope (FESEM). Results of EDX mapping analysis indicated homogeneous distribution of N dopants.

scholarly journals Preparation, Characterization and Intermediate-Temperature Electrochemical Properties of Er3+-Doped Barium Cerate–Sulphate Composite Electrolyte

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2752
Author(s):  
Fufang Wu ◽  
Ruifeng Du ◽  
Tianhui Hu ◽  
Hongbin Zhai ◽  
Hongtao Wang
Keyword(s):  
Maximum Output Power ◽  
Nitrogen Atmosphere ◽  
Maximum Output ◽  
Barium Cerate ◽  
X Ray Diffraction ◽  
Ac Impedance Spectroscopy ◽  
Raman Spectrometry ◽  
Composite Electrolyte ◽  
X Ray ◽  
Doped Barium Cerate

In this study, BaCe0.9Er0.1O3−α was synthesized by a microemulsion method. Then, a BaCe0.9Er0.1O3−α–K2SO4–BaSO4 composite electrolyte was obtained by compounding it with a K2SO4–Li2SO4 solid solution. BaCe0.9Er0.1O3−α and BaCe0.9Er0.1O3−α–K2SO4–BaSO4 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectrometry. AC impedance spectroscopy was measured in a nitrogen atmosphere at 400–700 °C. The logσ~log (pO2) curves and fuel cell performances of BaCe0.9Er0.1O3−α and BaCe0.9Er0.1O3−α–K2SO4–BaSO4 were tested at 700 °C. The maximum output power density of BaCe0.9Er0.1O3−α–K2SO4–BaSO4 was 115.9 mW·cm−2 at 700 °C, which is ten times higher than that of BaCe0.9Er0.1O3−α.

Characterization, electrical conduction and stability of Yb-doped barium cerate prepared by sol–gel method

Ionics ◽  
2007 ◽  
Vol 14 (5) ◽  
pp. 407-413 ◽  
Author(s):  
N. Osman ◽  
I. A. Talib ◽  
H. A. Hamid ◽  
A. M. Jani
Keyword(s):  
Electrical Conduction ◽  
Sol Gel ◽  
Barium Cerate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Doped Barium Cerate

Synthesis and Characterization of Sn Doped SiO2 by Reverse Micelle and Sol-Gel Process

2012 ◽  
Vol 724 ◽  
pp. 225-228
Author(s):  
Kwang Jin Jeong ◽  
Dong Sik Bae
Keyword(s):  
Reverse Micelle ◽  
Sol Gel ◽  
Processing Parameters ◽  
Metal Alkoxide ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Sol Gel Process ◽  
Hydrolysis And Condensation ◽  
Micro Emulsion ◽  
Average Size

Sn doped SiO2nanoparticles have been synthesized using a reverse micelle technique combined with metal alkoxide hydrolysis and condensation. The size of the particles and the thickness of the coating can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of tetraethyl orthosilicate (TEOS) within the micro-emulsion. The properties of the Sn doped SiO2nanoparticles were studied as a function of various processing parameters such as R and H value. The average size of synthesized Sn doped SiO2nanoparticles was about in the size range of 20-40 nm and core particle (Sn) 1-5 nm. The Sn doped SiO2nanoparticles were characterized by X-ray diffraction (XRD) and Transmission electron microscopy (TEM).

Fast Solidification and Electrical Conductivity of Apatite-Type Nanoceramics

2014 ◽  
Vol 981 ◽  
pp. 909-913
Author(s):  
Qin Li ◽  
Li Min Dong
Keyword(s):  
High Pressure ◽  
Sol Gel ◽  
Secondary Phase ◽  
X Ray Diffraction ◽  
Ac Impedance Spectroscopy ◽  
High Pressure Sintering ◽  
Conventional Sintering ◽  
Diffraction Patterns ◽  
Sintering Method ◽  
Apatite Type

Apatite oxides electrolytes La9.33(SiO4)6O2was prepared following the Sol-Gel aqueous route. The structure of La9.33(SiO4)6O2was evaluated using the X-ray diffraction patterns (PXRD). The main phase is La9.33Si6O26with the Minor impurity phase of La2SiO5as a secondary phase. And dense La9.33(SiO4)6O2nanoceramics with grain size of smaller than 100 nm were fabricated by high-pressure sintering, the pressure of 4.5 GPa, the sintering temperature of 1200oC and dwelling time of 10 min were used. The ionic conductivity of the samples is evaluated by AC impedance spectroscopy. The conductivity of dense La9.33(SiO4)6O2nanoceramics by high-pressure densification is one multiple higher compared with that of the microcrystalline ceramics. The activation energy in the samples by high-pressure densification and conventional sintering method was 1.06 eV and 1.44 eV, respectively.

The Role of Processing Parameters in Variation of Microstruture of Sol-Gel Derived Lead Zirconate Titanate Thin Films

1998 ◽  
Vol 541 ◽  
Author(s):  
Chang Jung Kim ◽  
Tae-Young Kim ◽  
Ilsub Chung ◽  
In Kyung Yoo
Keyword(s):  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Secondary Phase ◽  
Processing Parameters ◽  
Lead Zirconate ◽  
Test System ◽  
Pzt Thin Films ◽  
Force Microscopy

AbstractThe PZT thin films were fabricated to investigate the effect of sol-gel processing parameters on the physical and the electrical properties. The films were made with different amount of excess Pb precursors and drying temperatures, and then annealed in various ambients. The physical properties of the films such as crystallinity and microstructure were evaluated using x-ray diffraction, scanning electron microscopy and atomic force microscopy. The ferroelectric properties and current density characteristics of the films were investigated using a standarized feiroelectric test system and pA meter, respectively. It is found that the drying temperature was playing a key role in the formation of the secondary phase on the PZT thin films. In addition, it turned out that the use of nitrogen as an annealing ambient promoted overall ferroelectric properties, when compared to oxygen ambients.

Synthesis, Characterization and Bioactivity Studies of Calcium Silicate Bioceramics

2012 ◽  
Vol 584 ◽  
pp. 479-483 ◽  
Author(s):  
R. Lakshmi ◽  
Swamiappan Sasikumar
Keyword(s):  
Sol Gel ◽  
Combustion Process ◽  
Calcium Nitrate ◽  
Secondary Phase ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Sem Image ◽  
Gel Combustion ◽  
Ft Ir ◽  
Highly Porous

Wollastonite is one of the most widely used bioceramic due to its biocompatibility and bioactivity. Wollastonite (CaSiO3) was synthesized by sol-gel combustion process using citric acid as a fuel/reductant and nitrate as an oxidant. Calcium nitrate was taken as a source of calcium and tetraethyl orthosilicate was taken as the source of silicate. The obtained product was characterized by powder X-ray diffraction, Fourier - Transform Infrared spectroscopy and Scanning electron microscopy. The XRD pattern shows that the product formed is a pure and single phasic wollastonite. The FT-IR spectra revealed that there is no secondary phase present in the product. The SEM image shows that the product is highly porous. The particle size calculated using Scheerer’s formula shows that the particles are in a nano regime.

scholarly journals Structural and Thermophysical Studies of Composite Na-Cobaltite Electrospun Nanofibers

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Fatima-tuz-Zahra ◽  
M. Anis-ur-Rehman
Keyword(s):  
Thermal Conductivity ◽  
Flow Rate ◽  
Sol Gel ◽  
Electrospun Nanofibers ◽  
Processing Parameters ◽  
Electrospinning Process ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Electrospinning Technique ◽  
Energy Applications

Polymeric nanofibers have been produced in the last few years by electrospinning of polymer solutions. Polyvinyl alcohol (PVA) was the selected polymer for the preparation of nanofibers. Processing parameters like flow rate, needle gauge, needle to collector distance, and molarity of the solution have been optimized during electrospinning process. Sol-gel method has been used for the preparation of thermoelectric cobaltite nanoparticles having composition NaCoO2. Sol-gel combined electrospinning technique was used to prepare the composites of the NaCoO2 with PVA nanofibers. X-ray diffraction (XRD), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC) have been used for the structural analysis of the prepared samples. Scanning electron microscopy (SEM) was used to observe the morphology of the prepared fibers. SEM micrographs showed that, by increasing the flow rate, diameter of the fibers increased from 185 nm to 200 nm. Two-probe method and Advantageous Transient Plane Source (ATPS) were used to study the electrical and thermal transport properties, respectively. Thermal conductivity and electrical conductivity showed a direct dependence on temperature. It was observed that particles, sample has lower thermal conductivity (0.610 W/m-K) as compared to that of composite nanofibers (1.129 W/m-K). The measurements reported are novel and are useful for energy applications.

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