Dielectric relaxation of gamma irradiated muscovite mica

Journal Article · Sun Mar 15 00:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.11.034· OSTI ID:22420823

Kaur, Navjeet ^[1]; Singh, Mohan ^[1]; Singh, Lakhwant ^[1]; Awasthi, A. M. ^[2]; Lochab, S. P. ^[3]

---

1. Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005 (India)
2. Thermodynamics Laboratory, UGC-DAE Consortium for Scientific Research, Indore 452001 (India)
3. Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067 (India)

Highlights: • The present article reports the effect of gamma irradiation on the dielectric relaxation characteristics of muscovite mica. • Dielectric and electrical relaxations have been analyzed in the framework of dielectric permittivity, electric modulus and Cole–Cole formalisms. • The frequency dependent electrical conductivity has been rationalized using Johnsher’s universal power law. • The experimentally measured electric modulus and conductivity data have been fitted using Havriliak–Negami dielectric relaxation function. - Abstract: In the present research, the dielectric relaxation of gamma irradiated muscovite mica was studied in the frequency range of 0.1 Hz–10 MHz and temperature range of 653–853 K, using the dielectric permittivity, electric modulus and conductivity formalisms. The dielectric constants (ϵ′ and ϵ′′) are found to be high for gamma irradiated muscovite mica as compared to the pristine sample. The frequency dependence of the imaginary part of complex electric modulus (M′′) and dc conductivity data conforms Arrhenius law with single value of activation energy for pristine sample and two values of activation energy for gamma irradiated mica sample. The experimentally assessed electric modulus and conductivity information have been interpreted by the Havriliak–Negami dielectric relaxation explanation. Using the Cole–Cole framework, an analysis of real and imaginary characters of the electric modulus for pristine and gamma irradiated sample was executed which reflects the non-Debye relaxation mechanism.

• OSTI ID: 22420823
• Journal Information: Materials Research Bulletin, Vol. 63; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
COMPARATIVE EVALUATIONS
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
FREQUENCY DEPENDENCE
GAMMA RADIATION
IMPEDANCE
IRRADIATION
MHZ RANGE
MUSCOVITE
PERMITTIVITY
RADIATION EFFECTS
RELAXATION LOSSES
TEMPERATURE DEPENDENCE