Journal
MATERIALS LETTERS
Volume 227, Issue -, Pages 100-103Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.05.046
Keywords
Sr2SnO4; Ruddlesden Popper; Dielectric; Conductivity
Funding
- Ministry of Human Resource and Development (MHRD), Government of India
- Senior Research Fellowship (SRF)
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Ruddlesden Popper (RP) oxide Sr2SnO4 has been synthesized via a solid state reaction route by calcination at 1000 degrees C for 8 h. The Rietveld refinement of X-ray diffraction (XRD) pattern suggested tetragonal structure; I4/mmm space group and unit cell parameters a = b = 4.05084(5) angstrom, c = 12.59040(2) angstrom. Dielectric properties, electric modulus and ac conductivity have been studied as a function of both frequency (20 Hz-2 MHz) and temperature (70-600 degrees C) in air atmosphere. Dielectric constant and dissipation factor remains constant upto 600 degrees C above 1 KHz. AC conduction mechanism has been explained using Johnscher's Power law. The value of the activation energy for conduction, E-cond (obtained from DC conductivity) and dielectric relaxation, E-relax (obtained from modulus) is found to be the same indicating similar mechanism for both the processes. Based on the numerical value of activation energy, the conduction and relaxation processes are attributed to transfer of electron from Sn2+ to Sn4+ through the thermally assisted quantum mechanical tunneling process. (C) 2018 Elsevier B.V. All rights reserved.
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