Electrical Properties and Dipole Relaxation Behavior of Zinc-Substituted Cobalt Ferrite

2017 ◽  
Vol 46 (12) ◽  
pp. 6884-6894 ◽  
Author(s):  
Sweety Supriya ◽  
Sunil Kumar ◽  
Manoranjan Kar
Keyword(s):  
Electrical Properties ◽  
Cobalt Ferrite ◽  
Relaxation Behavior ◽  
Dipole Relaxation

Effects of BLT doping on electrical properties and relaxation behavior of BCZT-BLT ceramics

2020 ◽  
Vol 31 (23) ◽  
pp. 21005-21016
Author(s):  
Shun Luo ◽  
De-Yi Zheng ◽  
Chong Zhang ◽  
Yi Zhang ◽  
Bo Li
Keyword(s):  
Electrical Properties ◽  
Relaxation Behavior

Magnetic and electrical properties of In doped cobalt ferrite nanoparticles

2012 ◽  
Vol 112 (8) ◽  
pp. 084321 ◽  
Author(s):  
Razia Nongjai ◽  
Shakeel Khan ◽  
K. Asokan ◽  
Hilal Ahmed ◽  
Imran Khan
Keyword(s):  
Electrical Properties ◽  
Cobalt Ferrite ◽  
Ferrite Nanoparticles ◽  
Cobalt Ferrite Nanoparticles ◽  
Magnetic And Electrical Properties

Electrical properties and relaxation behavior of Bi0.5Na0.5TiO3-BaTiO3 ceramics modified with NaNbO3

2016 ◽  
Vol 36 (10) ◽  
pp. 2469-2477 ◽  
Author(s):  
Qi Xu ◽  
Michael T. Lanagan ◽  
Wei Luo ◽  
Lin Zhang ◽  
Juan Xie ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Relaxation Behavior

Multiple electrical phase transitions in nanocrystalline aluminium-substituted cobalt ferrite

2018 ◽  
Vol 32 (32) ◽  
pp. 1850358 ◽  
Author(s):  
Sweety Supriya ◽  
Sunil Kumar ◽  
Lagen Kumar Pradhan ◽  
Rabichandra Pandey ◽  
Manoranjan Kar
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Transition Temperature ◽  
Electrical Properties ◽  
Cobalt Ferrite ◽  
Ferroelectric Material ◽  
Relaxation Transition ◽  
Ferroelectric Materials ◽  
Transition Temperatures ◽  
Electrical Parameters

Electrical properties of a series of nanocrystalline aluminium-substituted cobalt ferrite CoAl[Formula: see text]Fe[Formula: see text]O4 (CAFO) with x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5 have been explored. The electrical parameters have been measured by employing impedance and techniques. The impedance has measured as a function of frequency and temperature for all the samples. The impedance increases with the increase in Al concentration in CAFO. Cobalt ferrite is yet to be verified as a ferroelectric material. However, the electrical properties reported here are similar to conventional ferroelectric materials. Multiple (two) electrical phase transitions have been observed, the two transition temperatures are identified as T[Formula: see text] and T[Formula: see text] i.e., one is dipole relaxation transition (T[Formula: see text]) and other one is electrical phase transition temperature. Both AC and DC measurements indicate the transition temperatures.

Magnetoelectric effect in cobalt ferrite-barium titanate composites and their electrical properties

Pramana ◽  
2002 ◽  
Vol 58 (5-6) ◽  
pp. 1115-1124 ◽  
Author(s):  
RP Mahajan ◽  
KK Patankar ◽  
MB Kothale ◽  
SC Chaudhari ◽  
VL Mathe ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Barium Titanate ◽  
Cobalt Ferrite ◽  
Magnetoelectric Effect

Thermophysical characterization of oil sands: 3. Electrical properties

1981 ◽  
Vol 18 (4) ◽  
pp. 742-750 ◽  
Author(s):  
M. Das ◽  
R. Thapar ◽  
K. Rajeshwar ◽  
J. DuBow
Keyword(s):  
Electrical Properties ◽  
Oil Sands ◽  
Activation Energies ◽  
Dielectric Constants ◽  
Relaxation Processes ◽  
Electrical Behavior ◽  
Frequency Range ◽  
Oil Sand ◽  
Dipole Relaxation ◽  
Mobile Charges

The electrical behavior of oil sand samples from the Athabasca, N. W. Asphalt Ridge, P. R. Spring, and Circle Cliffs deposits was studied in the frequency range 50 Hz – 103 MHz at ambient temperature and up to 550 °C. Anomalously high dielectric constants (ε′) were measured for these samples at low frequencies (<1 kHz) and at elevated temperatures (>200 °C). Accumulation of mobile charges at the phase boundaries in the oil sand matrix was probably responsible for this effect. These mobile charges were presumably created by thermal fragmentation of oil sand bitumen. The anomalous increase in the low-frequency (50 Hz – 1 MHz) ε′ values at temperatures above 150 °C was also traced to interfacial polarization effects. Dipole relaxation behavior was observed for the various samples at frequencies below ~1 kHz and in the temperature range 150–470 °C. Two distinct relaxation processes were identified. The low-temperature (150–400 °C) process had activation energies for dipole orientation ranging from 4.0 to 9.0 kJ/mol depending on the oil sand specimen. The second relaxation process, which occurred at temperatures above 400 °C, had significantly higher activation energies (30–34 kJ/mol). The occurrence of these dipole relaxation peaks may be relevant in the use of electrical techniques to map the location of pyrolysis zones in in situ oil sand retorts. Measurements on the Athabasca samples in the high-frequency range (1–103 MHz) revealed distinct changes in the dielectric parameters associated with the loss of water from the oil sand matrix. The electrical behavior of oil sands is represented in terms of an equivalent circuit model comprising discrete RC elements corresponding to various components in the oil sand matrix. Such a representation was found to aid in an assignment of the observed changes in the electrical properties with frequency and temperature to distinct physical or chemical processes occurring in the oil sand matrix.

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