Structural and Optical Properties of Zn0.8Co0.2O Ceramics

2008 ◽  
Vol 55-57 ◽  
pp. 337-340
Author(s):  
S. Sujinnapram ◽  
Wandee Onreabroy ◽  
T. Nantawisarakul
Keyword(s):  
Single Phase ◽  
Profile Analysis ◽  
Solid State Reaction Method ◽  
Analysis Method ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Absorption Bands ◽  
Grain Sizes ◽  
Full Profile ◽  
Diffraction Patterns

The Zn0.8Co0.2O ceramics were synthesized by the solid state reaction method with the mixture of ZnO and CoO powders. The mixed powders were sintered at 1200 °C and 1300 °C for 4 hours. It was found that the X-ray diffraction patterns of Zn0.8Co0.2O ceramics were similar to that of the pure ZnO one. The crystal structure of Zn0.8Co0.2O ceramics were then determined using the Rietveld full-profile analysis method to indicate a single phase with a wurtzite-like structure. Their microstructures were examined using the scanning electron microscopy. The results showed that their grain sizes were increased with increasing both the sintering temperatures and the doping effect. Moreover, the optical absorption spectra using UV-Vis spectrometer showed that there were several extra absorption bands appearing in the Zn0.8Co0.2O samples. This confirms that Co2+ is substituted Zn2+ in the wurtzite structure.

Deposition of TiO2 Thin Films Using Magnetron Sputtering

2011 ◽  
Vol 217-218 ◽  
pp. 1743-1746
Author(s):  
Xing Long Guo
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Magnetron Sputtering ◽  
Profile Analysis ◽  
Line Profile Analysis ◽  
Analysis Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Average Grain Size ◽  
Diffraction Patterns

TiO2 with 20nm in diameter have been prepared by using magnetron sputtering technique. The structure of these powers was determined by X-ray diffraction experiments. The average grain size and particle size in these powers were measured by the line profile analysis method of X-ray diffraction patterns and by scan electron microscopy, respectively. The thin films were investigated by using XRD, SEM measurements.

Effects of Cu Doping on the Microstructure and Electrical Properties of Sr3YCo4O10.5+δ Polycrystalline

2014 ◽  
Vol 934 ◽  
pp. 80-85
Author(s):  
Xiao Li Du ◽  
Lan Yu ◽  
Bin Zhang ◽  
Shi Jin Song ◽  
Guo Fang Li
Keyword(s):  
Porous Structure ◽  
Single Phase ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Cu Doping ◽  
Reaction Method ◽  
X Ray ◽  
Cu Content ◽  
Grain Sizes ◽  
Liquid Sintering

Polycrystalline samples of Sr3YCo4-xCuxO10.5+δ (x=0, 0.2, 0.4, 0.6) have been prepared by solid state reaction method. Crystal structure has been checked by X-ray diffraction (XRD) and the results indicate that Sr3YCo4-xCuxO10.5+δ (x=0, 0.2, 0.4) with single phase have been synthesized in air, and the lattice parameters of Sr3YCo4-xCuxO10.5+δ (x=0, 0.2, 0.4) increase with increasing Cu content. Microstructure analysis demonstrates that the grain sizes enlarge and the number of pores decreases with increasing Cu content. The change of porous structure with different Cu contents is discussed by the liquid sintering theory. The temperature dependence of resistivity (ρ-T) curves of Sr3YCo4-xCuxO10.5+δ show nonmetallic behavior. And the electrical resistivity decreases successively with increasing Cu content, which is caused by the porous structure scattering the carriers as well as the increase of hole carriers.

Structural and Optical Properties of Ti1-x Fex O2 Nanoparticles

2013 ◽  
Vol 432 ◽  
pp. 16-19
Author(s):  
Lila A. Alkhtaby
Keyword(s):  
Raman Spectroscopy ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Anatase Structure ◽  
X Ray ◽  
Diffraction Patterns ◽  
Group D ◽  
Fe Ions

We have synthesized the Ti1-x Fex O2 (x=0.01, 0.02, 0.03 and 0.05) nanoparticles by the sol gel method to enhance the photocatalyic property of TiO2 .These samples are characterized using x-ray diffraction (XRD), Raman spectroscopy, Ultraviolet /Visible (UV/V) spectroscopy and fluorescence spectroscopy (PL). The x-ray diffraction patterns show that all the sample are formed in single phase with a complete solubility of Fe ions in the TiO2 matrix. TiO2 nanoparticles are tetragonal with anatase structure belong to the space group D41h 9 (141 ) /amd Raman active modes appear at 150, 196, 396, 483, 516 and 637cm-1. UV/V spectra show a decrease in the band gap with the increase in Fe concentration from 3.26 eV (1% Fe concentration) to3.11 eV (5% Fe concentration).

scholarly journals Sintering temperature, microstructures and electrical properties of (Na1/2Bi1/2)0.94Ba0.06Ti0.97(Mg1/3Nb2/3)0.03O3 ferroelectric ceramic

2018 ◽  
Vol 50 (2) ◽  
pp. 245-253
Author(s):  
Enyew Zereffa ◽  
Teshome Seghne
Keyword(s):  
Electrical Properties ◽  
Ceramic Sample ◽  
Single Phase ◽  
Sintering Temperature ◽  
Ferroelectric Ceramic ◽  
Solid State Reaction Method ◽  
Rhombohedral Structure ◽  
X Ray Diffraction ◽  
Grain Sizes ◽  
Fine Grain

Polycrystalline lead-free (Bi1/2Na1/2)0.94Ba0.06 Ti1-x(Mg1/3Nb2/3)xO3 ceramic sample with x = 0.03 was prepared using a high-temperature solid-state reaction method. X-ray diffraction analyses indicated the formation of single-phase rhombohedral structure at 950?C calcinations temperature. The values of apparent particle size and lattice strain were seen to increase with the addition of 3 % of MgO & Nb2O5. Sintering was carried out at various temperatures ranging from 1100?C to 1200?C at 10?C increase. The effects of sintering on the characteristics of the ceramic sample were investigated. Microstructure investigation revealed improved homogeneity and uniform fine grain sizes at the optimal sintering temperature. The sample sintered at 1150?C has a better relative density (98 %) & electrical properties.

Synthesis and Luminescent Properties of Eu3+ Doped Double Molybdate Phosphors

2011 ◽  
Vol 211-212 ◽  
pp. 213-216 ◽  
Author(s):  
Zhi Yong Zhang ◽  
Yong Yang ◽  
Wei Li
Keyword(s):  
Single Phase ◽  
Broad Band ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Solid State Reaction Method ◽  
Double Molybdate ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Diffraction Patterns ◽  
Narrow Bands

A series of trivalent europium (Eu3+) doped double molybdate phosphors (MLa(MoO4)2, M = Li, Na, K) have been prepared via traditional solid state reaction method at 500-800 °C. Their crystal structures and luminescent properties have been investigated, finding that the phosphors take on single phase through X-ray diffraction patterns (XRD) sintered at 600, 700 and 800 °C for lithium, soldium and potassium salt, respectively.Their excited spectra consist of a broad band and three absorptions, in which the higher peaks locate at 400 nm and 470 nm in the region of 350-500 nm. Excited with 470 nm, the emission spectra are composed of four narrow bands and the strongest emission peak is located at 615 nm. The appropriate doping concentration of Eu3+was 10 mol% for the 615 nm emission. The results indicate that this Eu3+activated NaLa(MoO4)2phosphors are promising yellowish red phosphor for ultraviolet (UV) and blue InGaN-based white LED.

scholarly journals A deep convolutional neural network for real-time full profile analysis of big powder diffraction data

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Hongyang Dong ◽  
Keith T. Butler ◽  
Dorota Matras ◽  
Stephen W. T. Price ◽  
Yaroslav Odarchenko ◽  
...  
Keyword(s):  
Neural Network ◽  
Convolutional Neural Network ◽  
Real Time ◽  
Diffraction Data ◽  
Profile Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Full Profile ◽  
Diffraction Patterns ◽  
Multi Phase

AbstractWe present Parameter Quantification Network (PQ-Net), a regression deep convolutional neural network providing quantitative analysis of powder X-ray diffraction patterns from multi-phase systems. The network is tested against simulated and experimental datasets of increasing complexity with the last one being an X-ray diffraction computed tomography dataset of a multi-phase Ni-Pd/CeO2-ZrO2/Al2O3 catalytic material system consisting of ca. 20,000 diffraction patterns. It is shown that the network predicts accurate scale factor, lattice parameter and crystallite size maps for all phases, which are comparable to those obtained through full profile analysis using the Rietveld method, also providing a reliable uncertainty measure on the results. The main advantage of PQ-Net is its ability to yield these results orders of magnitude faster showing its potential as a tool for real-time diffraction data analysis during in situ/operando experiments.

scholarly journals Influence of Li2CO3 addition on electrical and magnetic properties of Ni0.6Mg0.4Fe2O4

2020 ◽  
Vol 10 (03) ◽  
pp. 2050003
Author(s):  
M. R. Hassan ◽  
M. T. Islam ◽  
M. N. I. Khan
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Low Frequency ◽  
Solid State Reaction Method ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical And Magnetic Properties ◽  
Frequency Regime ◽  
Xrd Patterns

In this research, influence of adding Li2CO3 (at 0%, 2%, 4%, 6%) on electrical and magnetic properties of [Formula: see text][Formula: see text]Fe2O4 (with 60% Ni and 40% Mg) ferrite has been studied. The samples are prepared by solid state reaction method and sintered at 1300∘C for 6[Formula: see text]h. X-ray diffraction (XRD) patterns show the samples belong to single-phase cubic structure without any impurity phase. The magnetic properties (saturation magnetization and coercivity) of the samples have been investigated by VSM and found that the higher concentration of Li2CO3 reduces the hysteresis loss. DC resistivity increases with Li2CO3 contents whereas it decreases initially and then becomes constant at lower value with temperature which indicates that the studied samples are semiconductor. The dielectric dispersion occurs at a low-frequency regime and the loss peaks are formed in a higher frequency regime, which are due to the presence of resonance between applied frequency and hopping frequency of charge carriers. Notably, the loss peaks are shifted to the lower frequency with Li2CO3 additions.

Structural, Dielectric and Electrical Studies of Ba4CaRTi3Nb7O30 (R = Eu, Dy) Ferroelectric System

2013 ◽  
Vol 547 ◽  
pp. 41-48 ◽  
Author(s):  
Prasun Ganguly ◽  
A.M. Biradar ◽  
A.K. Jha
Keyword(s):  
Single Phase ◽  
Microstructural Analysis ◽  
Tungsten Bronze ◽  
Negative Temperature ◽  
Xrd Analysis ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
Paraelectric Phase Transition ◽  
Orthorhombic Crystal Structure

The polycrystalline samples of Ba4CaRTi3Nb7O30 (R = Eu, Dy), members of tungsten-bronze family, were prepared by high-temperature solid state reaction method and studied for their dielectric and electrical properties. X-ray diffraction (XRD) analysis reveals the formation of single-phase compounds having orthorhombic crystal structure at room temperature. Microstructural analysis by scanning electron microscope (SEM) shows that the compounds have well defined grains, which are distributed uniformly throughout the sample. Detailed dielectric properties of the compounds as a function of frequency and temperature show that the compounds undergo non-relaxor kind of ferroelectric-paraelectric phase transition of diffuse nature. Ferroelectric, piezoelectric and pyroelectric studies of the compounds have been discussed in this paper. The temperature dependence of dc conductivity of the compounds have been investigated. The conductivity study over a wide temperature range suggests that the compounds have negative temperature coefficient of resistance (NTCR) behaviour.

PREPARATION OF SOME NANO SIZE COLOSSAL MAGNETO RESISTANCE MATERIALS BY THE SOL-GEL ROUTE

2003 ◽  
Vol 17 (01) ◽  
pp. 19-24 ◽  
Author(s):  
K. PADMAVATHI ◽  
V. RAJAKUMARI ◽  
M. VITHAL ◽  
V. PRASD ◽  
S. V. SUBRAMANYAM ◽  
...  
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Resistivity Measurements ◽  
Temperature Range ◽  
Ionic Size ◽  
Colossal Magneto Resistance ◽  
Magneto Resistance ◽  
Nano Size

A series of colossal magneto resistance materials having compositional formula Re 0.67 Sr 0.33 MnO 3 (Re = Nd, Gd, … etc.) were prepared by the sol-gel method, using Ethylene glycol as a gelating reagent. The materials were characterized by the powder X-ray diffraction technique and are found to be single phase with orthorhombic structure. The particle size of all the materials were calculated using the well known Shearer formula and are found to be in the range of 20–45 nm. In order to determine the transition temperature (T c ), the DC electrical resistivity measurements were also carried out over a temperature range 80–300 K using the four probe method and it has been observed that the T c values are found to increase with increasing ionic size. Finally the magneto resistance measurements were also undertaken in the temperature range 80–300 K and it has been found that the MR values of these materials are better when compared with those prepared by the solid state reaction method.

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