Temperature dependent AC-Conduction and relaxation mechanism of spinel MgCo2O4 system by impedance spectroscopy

2021 ◽  
Vol 600 ◽  
pp. 412581
Author(s):  
Syeda Arooj Fatima ◽  
M. Nasir Khan ◽  
R. Shaheen ◽  
K. Shahzad ◽  
Mazhar Iqbal
Keyword(s):  
Impedance Spectroscopy ◽  
Relaxation Mechanism ◽  
Temperature Dependent ◽  
Ac Conduction

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.

Temperature dependent charge conduction and relaxation mechanism study of nano-structure WO3 by impedance spectroscopy

2019 ◽  
Vol 6 (12) ◽  
pp. 1250a5
Author(s):  
Ayaz Arif Khan ◽  
Muhammad Nasir Khan ◽  
Mazhar Iqbal ◽  
Asif Majeed ◽  
Abdul Jalil ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Relaxation Mechanism ◽  
Mechanism Study ◽  
Temperature Dependent ◽  
Nano Structure

Temperature dependent impedance spectroscopy of (Co3O4)x/CuTl-1223 nanoparticles-superconductor composites

2018 ◽  
Vol 44 (4) ◽  
pp. 4351-4359 ◽  
Author(s):  
M. Mumtaz ◽  
M. Naveed ◽  
Badshah Amin ◽  
M. Imran ◽  
M. Nasir Khan
Keyword(s):  
Impedance Spectroscopy ◽  
Temperature Dependent

Dielectric Behavior of Mechano-chemically Synthesized [(CH3NH3)3Bi2Br9]: A Lead Free Hybrid Perovskite

2021 ◽  
Author(s):  
Swagatalaxmi Pujaru ◽  
Priyabrata Sadhukhan ◽  
Basudev Ghosh ◽  
Arup Dhara ◽  
Sachindranath Das
Keyword(s):  
Impedance Spectroscopy ◽  
Complex Impedance ◽  
Negative Temperature ◽  
Dielectric Behavior ◽  
Lead Free ◽  
Published Data ◽  
Temperature Dependent ◽  
Microstructural Parameters ◽  
Hybrid Perovskite ◽  
Refinement Method

Abstract Lead free hybrid halide perovskite (CH3NH3)3Bi2Br9 has been successfully synthesized by mechano-chemical method. The microstructure analysis by Rietveld’s refinement method revealed that the crystal belongs to trigonal system with space group P3 ̅m1. The obtained microstructural parameters are well in agreement with the previously published data. Temperature-dependent ac conductivity, impedance spectroscopy, and complex dielectric properties have been investigated in detail. The negative temperature coefficient of resistance behaviour reveals the semiconducting nature of the materials. The complex impedance spectroscopy also supports the semiconducting nature of the sample with activation energy for conduction ~0.38 eV.

1HNMR Study on the Motion of NH4+ in Ferroelectric NH4H(ClH2CCOO)2 and Mixed (NH4)1-xRbxH(ClH2CCOO)2 (x = 0.15)

2002 ◽  
Vol 57 (11) ◽  
pp. 883-887 ◽  
Author(s):  
M. Zdanowska-Fra̡czek ◽  
A. Kozaka ◽  
R. Jakubasb ◽  
J. Wa̡sickia ◽  
R. Utrechta
Keyword(s):  
Relaxation Time ◽  
Group Dynamics ◽  
Nmr Relaxation ◽  
Activation Parameters ◽  
Lattice Relaxation ◽  
Relaxation Mechanism ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Temperature Dependent ◽  
Spin Lattice

Temperature-dependent proton NMR relaxation time measurements have been performed at 60 MHz in order to study the NH4+ dynamics in ferroelectric NH4H(ClH2CCOO)2 and mixed Rbx(NH4)1-x(ClH2CCOO)2, where x = 0.15. The data indicate that the dominant relaxation mechanism for the NMR spin-lattice relaxation time T 1 in both crystals involves simultaneous NH4 group reorientation about their C2 and C3 symmetry axis in the paraelectric phase. Details of the NH4+reorientation have been inferred from analysis of temperature dependence of T1 assuming the Watton model. The activation parameters of the motionshave been determined.It has been found that the substitution of Rb does not change the activation parameters of the NH4 group dynamics.

scholarly journals Elucidation of the role of guanidinium incorporation in single-crystalline MAPbI3 perovskite on ion migration and activation energy

2020 ◽  
Vol 22 (20) ◽  
pp. 11467-11473 ◽  
Author(s):  
Apurba Mahapatra ◽  
Rashmi Runjhun ◽  
Jan Nawrocki ◽  
Janusz Lewiński ◽  
Abul Kalam ◽  
...  
Keyword(s):  
Activation Energy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Temperature Dependent ◽  
Ion Migration ◽  
Single Crystalline

We have studied the effect of guanidinium incorporation in a single-crystalline MAPbI3 perovskite on ion migration using temperature-dependent electrochemical impedance spectroscopy.

scholarly journals Temperature dependent broadband impedance spectroscopy on poly-(p-phenylene-vinylene) light-emitting diodes

1998 ◽  
Vol 83 (10) ◽  
pp. 5045-5055 ◽  
Author(s):  
J. Scherbel ◽  
P. H. Nguyen ◽  
G. Paasch ◽  
W. Brütting ◽  
M. Schwoerer
Keyword(s):  
Impedance Spectroscopy ◽  
Light Emitting Diodes ◽  
Phenylene Vinylene ◽  
Temperature Dependent ◽  
Light Emitting
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