DIELECTRIC RELAXATION AND ELECTRICAL STUDY OF BaNb2O6 PREPARED BY SOL–GEL ROUTE

2011 ◽  
Vol 25 (14) ◽  
pp. 1229-1239
Author(s):  
P. K. BAJPAI ◽  
K. N. SINGH
Keyword(s):  
Electrical Properties ◽  
Dielectric Relaxation ◽  
Sol Gel ◽  
Impedance Spectrum ◽  
Relaxation Mechanism ◽  
Stoichiometric Ratio ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Impedance Spectroscopy Technique ◽  
Ac Conduction

A gel was formed when an aqueous solution of BaCl 2, NbF 5 and citric acid in stoichiometric ratio is heated on a water bath at 100°C. This gel on decomposition at 700°C yielded the nano phase of BaNb 2 O 6 as confirmed by X-ray diffraction study. The crystal structure is orthorhombic with unit cell parameter a = 12.2136 Å, b = 10.2413 Å, c = 7.8831 Å. The estimated grain size is 88 nm. Dielectric studies reveal the dielectric relaxation mechanism. Conducting charges and free charges both contribute to the dielectric relaxation in this material. Electrical properties of the material were studied using impedance spectroscopy technique. Detailed analysis of impedance spectrum suggested that the electrical properties are strongly temperature-dependent. The relaxation is polydispersive and conduction is mainly through grains. AC conduction activation energies are estimated from Arrheneus plots and conduction mechanism is discussed.

scholarly journals Frequency and Temperature Dependent Dielectric Response of Fe3O4 Nano-crytallites

2014 ◽  
Vol 6 (3) ◽  
pp. 399-406 ◽  
Author(s):  
M. Z. Ansar ◽  
S. Atiq ◽  
K. Alamgir ◽  
S. Nadeem
Keyword(s):  
Magnetite Nanoparticles ◽  
Sol Gel ◽  
Dielectric Behavior ◽  
Tangent Loss ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Dielectric Tangent Loss ◽  
Auto Combustion ◽  
Combustion Technique

Magnetite nanoparticles have been prepared by using sol-gel auto combustion technique. The samples are prepared by using different concentrations of fuel. Structural characterization has been done using X-Ray diffraction technique and it was observed that fuel concentration can affect the structural properties of Magnetite nanoparticles. The dielectric properties for all the samples such as dielectric constant (??), dielectric tangent loss (tan ?) and dielectric loss factor (??) have been studied as a function of frequency and temperature in the range 10 Hz–20 MHz  and it was found that these nanoparticles can be used in microwave devices because of their good dielectric behavior. © 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v6i3.17938 J. Sci. Res. 6 (3), 399-406 (2014)

STUDY OF THE ELECTRICAL PROPERTIES OF SOL-GEL-DERIVED TITANIUM-VANADIUM OXIDE FILMS

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4465-4468 ◽  
Author(s):  
GAOLING ZHAO ◽  
GAORONG HAN
Keyword(s):  
Solid Solution ◽  
Electrical Properties ◽  
Vanadium Oxide ◽  
Hall Mobility ◽  
Sol Gel ◽  
Oxide Films ◽  
X Ray Diffraction ◽  
Type Semiconductor ◽  
Titanium Vanadium ◽  
Vanadium Oxide Films

Titanium-vanadium oxide films were prepared by the sol-gel method. The effects of vanadium incorporation on the crystallization behavior TiO 2 were investigated by X-ray diffraction analysis. The results showed that anatase and rutile type solid solution Ti 1-x V x O 2 films were obtained for x < 0.15 and x > 0.15 samples, respectively. Anatase and V 2 O 5 were found in x = 0.15 sample. Moreover, it was found that the crystallization of the film increased with increasing amount of vanadium. The electrical properties of Ti 1-x V x O 2 films were studied by measuring their resistance and Hall mobility. It was revealed that the resistivity of Ti 1-x V x O 2 films decreased with increasing x when the solid solution was formed, while the resistivity increased when the crystallization of vanadium oxide precipitated. The Hall constant was negative, indicating that Titanium-vanadium oxide is an n-type semiconductor. The evolution of the resistance and Hall mobility was ascribed to the 3d electrons of vanadium.

Structural and Electrical Properties of (Cu, Co) Co-Doped ZnO Thin Film

2013 ◽  
Vol 774-776 ◽  
pp. 964-967
Author(s):  
Ping Cao ◽  
Yue Bai
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Hall Effect Measurement ◽  
X Ray Diffraction ◽  
Zno Film ◽  
Co Doping ◽  
Structural And Electrical Properties ◽  
Doped Zno ◽  
Cu Ions ◽  
Co Doped

Successful synthesis of Cu, Co co-doped ZnO film is obtained by sol-gel method. The structural and electrical properties of the sample were investigated. X-ray diffraction spectroscopy analyses indicate that the Co and Cu co-doping can not disturb the structure of ZnO. No additional peaks are observed in the Zn0.99Co0.01CuxO and Cu+ and Co2+ substitute for Zn2+ without changing the wurtzite structure. By Hall-effect measurement p-type conductivity was observed for the Cu co-doped film. XPS result confirmed Cu ions are univalent in the films.

STUDIES ON THE TiO2 THIN FILMS DOPED WITH Fe3+

2005 ◽  
Vol 19 (01n03) ◽  
pp. 671-673
Author(s):  
PENG XIAO ◽  
WANLU WANG
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Electrical Properties ◽  
Sol Gel ◽  
Experimental Results ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
Gel Method ◽  
X Ray ◽  
Nanometer Particles

The Fe 3+- TiO 2 thin films obtained through sol-gel method were characterized by x-ray diffraction, AFM and Raman spectroscopy. It was found that TiO 2 films consisted of nanometer particles. The experimental results shows that the nanometer TiO 2 thin films doped with Fe 3+ were greatly improved in the activity aspect. This may be ascribed to change their structure and electrical properties after doping with Fe 3+. The results were discussed theoretically in detail.

Structural, Electrical, and AC-Resistivity Studies of BNT-KN Piezoelectric Ceramics

2020 ◽  
Vol 557 (1) ◽  
pp. 28-42
Author(s):  
Srinivas Pattipaka ◽  
Sweety Bora ◽  
D. Pamu
Keyword(s):  
Dielectric Response ◽  
Sol Gel ◽  
Relaxor Behavior ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Critical Temperatures ◽  
Two Phase ◽  
Structure Morphology ◽  
Sol Gel Process ◽  
Diffraction Patterns

The lead-free (1 – x) Bi0.5Na0.5TiO3 – x KNbO3 (BNT-KN; x = 0 – 0.12) composite ceramics have been synthesized by a sol-gel process. Their structure, morphology, AC conductance and dielectric response were studied systematically. The X-ray diffraction patterns of BNT-KN revealed a morphotropic phase boundary between a rhombohedral and a pseudocubic structure. The temperature-dependent dielectric response of pure BNT revealed two-phase transitions at 200 °C (TR-T or Td) and 320 °C (TC). Furthermore, the critical temperatures were found to shift to lower values with increasing KN concentration. The manifested relaxor behavior was well confirmed by a modified Curie – Weiss law. The hopping conduction mechanism in BNT-KN was characterized through AC-resistivity analysis.

Synthesis, Structure and Electrical Properties of Pr-Doped Apatite-Type Lanthanum Silicates

2015 ◽  
Vol 1094 ◽  
pp. 155-159
Author(s):  
Li Peng Tian ◽  
Zhi Hua Ren
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Complex Impedance ◽  
Impedance Analysis ◽  
Total Conductivity ◽  
X Ray Diffraction ◽  
Complex Impedance Analysis ◽  
Sol Gel Process ◽  
Lanthanum Silicates ◽  
Apatite Type

Apatite-type lanthanum silicates doped with Pr3+ at the La site, La10-xPrxSi6O27 (x = 0, 1, 2, 3, 4, 4.5), were synthesized via sol-gel process. Thermal behavior of the dried gel of La10-xPrxSi6O27 sample was studied using TG/DTA. X-ray diffraction, SEM and complex impedance analysis were used to investigate the microstructure and electrical properties of La10-xPrxSi6O27 ceramics. The XRD results indicated the maximum doping quantity of Pr3+ is x = 4.5. Lanthanum silicates doped with Pr3+ cations have a higher total conductivity than that of undoped lanthanum silicates. The enhanced total conductivity depends on the improved density of La10-xPrxSi6O27 (x = 0, 1, 2, 3, 4, 4.5). At 973K, the highest total conductivity is 1.36×10-3S.cm-1 for La9PrSi6O27 ceramic.

scholarly journals Investigation on microstructure and electrical properties of Bi doping Ca3Co4O9 nanoparticles synthesized by sol-gel process

2018 ◽  
Vol 7 (2.29) ◽  
pp. 31
Author(s):  
Mohammed M A ◽  
Izman Sudin ◽  
Alias Mohd Noor ◽  
Srithar Rajoo ◽  
Uday M B ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Electrical Properties ◽  
Sol Gel ◽  
Combustion Method ◽  
Variable Pressure ◽  
X Ray Diffraction ◽  
Sol Gel Process ◽  
Gel Combustion ◽  
Bi Doping ◽  
Increasing Temperature

In this study, nanoparticles of Bi doped Ca3-xCo4O9 [Ca3-xBixCo4O9 where x=0, 0.2, 0.4 and 0.6] were prepared by sol gel combustion method. The phase structures and microstructures of Bi doped Ca3-xCo4O9 powders preparation were investigated. The microstructural observations of different Bi doped Ca3-xCo4O9 powders were evaluated using X-ray diffraction analysis (XRD) and Variable Pressure Scanning Electron Microscope (VPSEM). The bulk Ca3-xBixCo4O9 samples were fabricated using uniaxial cold pressing technique. Electrical resistivity of bulk Ca3-xBixCo4O9 samples with different doping was measured using four-probe method from 300 to 700°K. The electrical resistivity was found to decrease with increasing temperature for the bulk Ca3-xBixCo4O9 samples. The electrical properties of Ca3-xBixCo4O9 are non-monotonic functions of x. 

Sintering temperature dependent electrical properties of sol–gel grown nanostructured Bi0.95Nd0.05FeO3 multiferroics

2019 ◽  
Vol 93 (3) ◽  
pp. 666-677 ◽  
Author(s):  
Drashti Sanghvi ◽  
Hetal Boricha ◽  
Bharavi Hirpara ◽  
Sapana Solanki ◽  
V. G. Shrimali ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Temperature Dependent

Study of the Structure, Microstructure and Temperature Dependent Thermal Conductivity Properties of SrTiO3: Via Y3+ Substitution

2021 ◽  
Vol 69 ◽  
pp. 33-42
Author(s):  
Mohammed Tihtih ◽  
Jamal Eldin F.M. Ibrahim ◽  
Emese Kurovics ◽  
László A. Gömze
Keyword(s):  
Thermal Conductivity ◽  
Lattice Strain ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Xrd Pattern ◽  
X Ray ◽  
Gel Technique ◽  
Temperature Dependent Thermal Conductivity

Yttrium (Y) modified strontium titanate (SrTiO3) powders with initial concentration of Y in the range of 0 to 15 mol% were produced through sol-gel technique. X-ray diffraction (XRD) studies show that all the prepared compounds have a perovskite cubic structure with the space group (Pm3m). The lattice constant, lattice strain and crystallite size of the as-prepared samples were estimated from the XRD pattern which reveals the incorporation of Y into SrTiO3 system, moreover to investigate the quality of the prepared SrYT ceramics powder, the scanning electron microscopy (SEM) was used to determined investigate the morphology, grain size and its distribution. The analysis of the thermal conductivity measurements performed on the obtained powders revealed the effect of the combination of temperature and Y content on the thermal conductivity value, Indeed, the minimum thermal conductivity was 4.12 W/(mK) obtained with 15%Y at 464 K.

ELECTRICAL PROPERTIES OF LiCoVO4 CERAMICS

2011 ◽  
Vol 25 (12) ◽  
pp. 1619-1628 ◽  
Author(s):  
MOTI RAM
Keyword(s):  
Electrical Properties ◽  
Complex Modulus ◽  
Cell Structure ◽  
Complex Impedance ◽  
Lattice Parameter ◽  
Conductivity Relaxation ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Compound Formation ◽  
C Complex

Solution-based chemical method was used to prepare the compound LiCoVO 4. Compound formation was checked by X-ray diffraction (XRD) study and it revealed a cubic unit cell structure with lattice parameter: a = 8.2840 (3) Å. Complex impedance result shows bulk contribution to electrical properties up to 225°C, grain boundary effects for all T ≥ 250° C , and evidence of temperature-dependent electrical relaxation phenomena in the material. The values of activation energy were determined from the Arrhenius plot of DC conductivity versus 103/T and were equal to ~0.09 eV at 50–200°C and ~0.48 eV at 200–350°C. Complex modulus study indicates non-Debye type (polydispersive) conductivity relaxation in the compound.

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