IMPEDANCE SPECTROSCOPIC STUDIES ON GdBi5Fe2Ti3O18 CERAMIC

2001 ◽  
Vol 15 (14) ◽  
pp. 2053-2065 ◽  
Author(s):  
N. V. PRASAD ◽  
G. PRASAD ◽  
T. BHIMASANKARAM ◽  
S. V. SURYANARAYANA ◽  
G. S. KUMAR
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Complex Impedance ◽  
Impedance Measurement ◽  
Solid State Reaction Method ◽  
Spectroscopic Studies ◽  
Conductivity Measurements ◽  
Frequency Range ◽  
Reaction Method ◽  
Complex Impedance Measurement

GdBi 5 Fe 2 Ti 3 O 18 (GBFT), a compound of Aurivillius family, was prepared by solid state reaction method. Complex impedance measurement was made on these samples from room temperature to 500°C in the frequency range of 1 kHz–1 MHz. Cole–Cole plots were found to become very broad near 400°C. Dielectric and dc conductivity measurements were made on these samples. The results are analysed to understand the conductivity mechanism.

Dielectric and Impedance Spectroscopic Studies of SrBi4-xLaxTi4O15

2012 ◽  
Vol 428 ◽  
pp. 52-56 ◽  
Author(s):  
K. Ashok ◽  
Pasala Sarah ◽  
V.S. Raju
Keyword(s):  
Impedance Measurement ◽  
Solid State Reaction Method ◽  
Spectroscopic Studies ◽  
Frequency Range ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Temperature Range ◽  
Ceramic Samples ◽  
Xrd Studies

Ceramic samples of SrBi4-xLaxTi4O15with x=0.025 is prepared by standard solid state reaction method. The phase formation is confirmed by X-ray diffraction (XRD) studies. The Dielectric and Impedance measurement has been performed in the temperature range 50°C to 600°C and the frequency range 1Hz to 1MHz. The Curie temperature is found to decrease from 535°C to 505°C. The Cole-Cole plots are semi circles in the temperature range 450°C to600°C. The relaxation time is decreased with increase of temperature. The investigations on this material at high temperatures and frequencies reveal its stable behavior.

Application of Impedance Spectroscopy for Bi1−xNdxFeO3 Ceramics Characterization

2012 ◽  
Vol 730-732 ◽  
pp. 71-75
Author(s):  
Beata Wodecka-Dus ◽  
Jolanta Dzik ◽  
Henryk Bernard ◽  
Katarzyna Osinska ◽  
Agata Lisińska-Czekaj ◽  
...  
Keyword(s):  
Solid State ◽  
Impedance Spectroscopy ◽  
Solid State Reaction ◽  
Room Temperature ◽  
Single Phase ◽  
Solid State Reaction Method ◽  
Frequency Range ◽  
Reaction Method ◽  
Synthesis Conditions

In the present paper the synthesis conditions for fabrication of Bi1−xNdxFeO3ceramics are reported. The single phase polycrystalline samples of Bi1−xNdxFeO3 were prepared by standard solid state reaction method from the mixture of oxides viz.: Bi2O3, Fe2O3and Nd2O3. The samples were characterized by impedance spectroscopy in the frequency range 10Hz – 1MHz at room temperature.

Facile preparation of polyoxometalate nanoparticles via a solid-state chemical reaction for aerobic oxidative desulfurization catalysis

2021 ◽  
Author(s):  
Hang Yu ◽  
Wenwen Bu ◽  
Zijia Wang ◽  
Zhuoyue Zhao ◽  
Mehwish Jadoon ◽  
...  
Keyword(s):  
Solid State ◽  
Silver Nitrate ◽  
Chemical Reaction ◽  
Solid State Reaction ◽  
Room Temperature ◽  
Oxidative Desulfurization ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
State Chemical ◽  
Facile Preparation

Polyoxometalate nanoparticles were synthesized via a concise solid-state reaction method by directly grinding silver nitrate and the polyoxometalate (NH4)5H6PMo4V8O40 at room temperature without the assistance of a surfactant.

scholarly journals Structure and electric properties of cerium substituted SrBi1.8Ce0.2Nb2O9 and SrBi1.8Ce0.2Ta2O9 ceramics

2016 ◽  
Vol 10 (3) ◽  
pp. 183-188 ◽  
Author(s):  
Mohamed Afqir ◽  
Amina Tachafine ◽  
Didier Fasquelle ◽  
Mohamed Elaatmani ◽  
Jean-Claude Carru ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Solid State ◽  
Room Temperature ◽  
Single Phase ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Lcr Meter ◽  
Curie Temperature Tc

SrBi1.8Ce0.2Nb2O9 (SBCN) and SrBi1.8Ce0.2Ta2O9 (SBCT) powders were prepared via solid-state reaction method. X-ray diffraction analysis reveals that the SBCN and SBCT powders have the single phase orthorhom-bic Aurivillius structure at room temperature. The contribution of Raman scattering and FTIR spectroscopy of these samples were relatively smooth and resemble each other. The calcined powders were uniaxially pressed and sintered at 1250?C for 8 h to obtaine dense ceramics. Dielectric constant, loss tangent and AC conductivity of the sintered Ce-doped SrBi2Nb2O9 and SrBi2Ta2O9 ceramics were measured by LCR meter. The Ce-doped SBN (SBCN) ceramics have a higher Curie temperature (TC) and dielectric constant at TC (380?C and ?? ~3510) compared to the Ce-doped SBT (SBCT) ceramics (330?C and ?? ~115) when measured at 100Hz. However, the Ce-doped SBT (SBCT) ceramics have lower conductivity and dielectric loss.

scholarly journals Thermoelectric properties of LaFeO3 system with doped Ti, Co, Cu

2017 ◽  
Vol 126 (1B) ◽  
pp. 147
Author(s):  
Nguyen Thi Thuy
Keyword(s):  
Electron Microscope ◽  
Solid State ◽  
Room Temperature ◽  
Unit Cell Volume ◽  
Single Phase ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Scanning Electron

<p><strong>Abstract: </strong>LaFeO<sub>3</sub> system with doped Ti, Co, Cu was manufactured by solid state reaction method, it was sintered at 1250<sup>0</sup>C and 1290<sup>0</sup>C in 10 hours with a heating rate of 3<sup>0</sup>C/min. Using X-ray diffraction and Scanning Electron Microscope (SEM) to examine the structure, it reveals that samples are single-phase and orthogonal-perovskite structure describing by the Pnma space group, the unit cell volume of the samples increases when Ti, Co, Cu are doped to replace ion Fe<sup>+3</sup>. The size of particle increase while raising the temperature of sintering. Measuring the resistance which depends on temperature between the room temperature and 1000K, it can be seen that when doping Co, Cu with the nominal component La(Fe<sub>0,2</sub>Co<sub>0,2</sub>Ti<sub>0,6</sub>)O<sub>3</sub> and La(Fe<sub>0,4</sub>Cu<sub>0,1</sub>Ti<sub>0,5</sub>)O<sub>3 </sub>, the conductivity of samples increases respectively. Especially, the conductivity of Cu doped sample is higher than two other samples, and reach the highest conductivity at about 900<sup>0</sup>C, Seebeck coefficient S of La(Fe<sub>0.6</sub>Ti<sub>0.4</sub>)O<sub>3</sub> can be change from positive to negative at the temperature of around 700<sup>0</sup>C.</p>

Influence of Sintering Temperatures on Microstructures and the Thermal Conductivity of CuAlO2 Ceramics

2016 ◽  
Vol 848 ◽  
pp. 222-227 ◽  
Author(s):  
Zi Jun Song ◽  
Lian Jun Wang ◽  
Wan Jiang ◽  
Wei Luo
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Solid State ◽  
Room Temperature ◽  
Solid State Reaction Method ◽  
Oxide Ceramic ◽  
Synthetic Process ◽  
Reaction Method ◽  
Environmental Friendly ◽  
Different Temperatures

Oxide ceramic is a kind of environmental friendly materials, which has attracted more and more interests for its bunch of advantages such as sound chemical, thermal stability, simple synthetic process, cheap price, harmless and safety. Therefore, Oxide ceramic will be a promising material in the future. In this work, polycrystalline samples of CuAlO2 were prepared by a solid state reaction method. The mixture of pure CuO and Al2O3 powders was firstly pressed under the pressure of 60 MPa, and then 200 MPa to prepare pellets of 5 mm thick and 10 mm in diameter. The green compacts were sintered at five different temperatures (1273 K, 1323 K, 1373 K, 1423 K, 1473 K) for various holding times (5 h, 10 h and 15 h) in the air and then the furnace cooled. The crystalline and microstructures of the sintered CuAlO2 bodies were detected by XRD and SEM. The properties of density, thermal conductivity were also investigated in detail. The experimental results show that CuAlO2 bodies were rhombohedral, belonging to R3m space group. It is found that the density and the thermal conductivity of CuAlO2 ceramics were significantly dependent on the sintering temperatures. The density and thermal conductivity increased with increasing the sintering temperatures. The thermal conductivity of samples sintered at 1273 and 1473 K with the same holding time (10 h) were 9.70 and 35.53 W/mk at the room temperature, 3.41 and 8.29 W/mk at 1100 K, respectively.

scholarly journals Structural, dielectric and conductivity studies of LiNi0.75Mg0.25-xCuxPO4 synthesized by solid state reaction method

2016 ◽  
Vol 10 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Kotamalige Anand ◽  
Bhajanthri Ramamurthy ◽  
Valaparla Veeraiah ◽  
Kannipamula Babu
Keyword(s):  
Solid State ◽  
Impedance Spectroscopy ◽  
Solid State Reaction ◽  
Complex Impedance ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
Different Temperatures ◽  
Impedance Spectroscopy Technique ◽  
Ftir Technique

The olivine structured LiNi0.75Mg0.25-xCuxPO4 (x = 0, 0.05 and 0.1) cathode materials were synthesized by solid state reaction method. The XRD, FTIR and FESEM studies were conducted to investigate the phase purity, crystal structure, lattice parameters and morphology, respectively. The powder X-ray diffraction studies confirmed the single phase formation of the pure and doped compounds which are found to be orthorhombic with the parent LiNiPO4. Morphology and grain sizes of the materials were investigated through FESEM. The FTIR technique was used to characterize the stretching and bending vibrational modes of different functional groups existing in the materials. The cathode properties were analysed through impedance spectroscopy and indicated on improved electrical properties of the doped samples as compared to the pure LiNiPO4. The conductivity and modulus analyses of the samples were carried out at different temperatures and frequencies using the complex impedance spectroscopy technique.

Photoresponsive character in double-doped La2/3(Ca2/3Sr1/3)1/3MnO3 thin film

2005 ◽  
Vol 83 (7) ◽  
pp. 699-704 ◽  
Author(s):  
Y. Wang ◽  
R Ren ◽  
C Chen ◽  
D Ren ◽  
K Jin ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Solid State ◽  
Room Temperature ◽  
Rf Magnetron Sputtering ◽  
Solid State Reaction Method ◽  
Metallic State ◽  
Reaction Method ◽  
Temperature Range ◽  
Cw Laser

A Ca, Sr double-doped La2/3(Ca2/3Sr1/3)1/3MnO3 thin film with a thickness of about 60~nm was deposited on (100) LaAlO3 substrates using the RF magnetron sputtering method from the bulk compound prepared using the solid-state reaction method. The experimental results show that a phase transition from the ferromagnetic metallic state to the paramagnetic insulating state occurs at 341 K (near to Tp, the highest peak temperature). The R–T curve deviation of the thin film with the application of CW laser is dramatic in the low-temperature range and Δ R/R is positive. At 276 K, the Δ R/R reaches the maximum, about 41 %, and the temperature of the photo-induced resistance maximum of this double-doped thin film appears near to room temperature range, which offers a new method for the application of CMR photo-electric devices.PACS Nos.: 78.66.–w, 81.07–b

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