NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2013, 4 (3), P. 357–362
DIELECTRIC STUDIES OF NANOCRYSTALLINE MANGANESE TUNGSTATE
N. Aloysius Sabu – Nanoscience Research Centre (NSRC), Department of Physics, Nirmala College, Muvattupuzha – 686 661, Kerala, India
K. P. Priyanka – Nanoscience Research Centre (NSRC), Department of Physics, Nirmala College, Muvattupuzha – 686 661, Kerala, India
Smitha Thankachan – Department of Physics, Maharaja’s College, Ernakulam – 682 011, Kerala, India
Anu Tresa Sunny – School of Chemical Sciences, MG University, Kottayam – 686 560, Kerala, India
E. M. Mohammed – Department of Physics, Maharaja’s College, Ernakulam – 682 011, Kerala, India
O.P. Jaseentha – Nanoscience Research Centre (NSRC), Department of Physics, Nirmala College, Muvattupuzha – 686 661, Kerala, India
Thomas Varghese – Nanoscience Research Centre (NSRC), Department of Physics, Nirmala College, Muvattupuzha – 686 661, Kerala, India; nanoncm@gmail.com
The dielectric properties of monoclinic manganese tungstate have been studied as a function of frequency and temperature. It was found that the dielectric constant and dielectric loss for all temperatures had high values at low frequencies which decreased rapidly as frequency increased attaining a constant value at higher frequencies. The a.c. conductivity increased as frequency increased, conforming small polaron hopping. As temperature increased, the values of the a.c. conductivity are shifted to higher values. Higher values were also obtained when the particle size decreased. These properties make the nano-sized MnWO4 as a promising material for fabricating humidity sensors.
Keywords: dielectric studies, manganese tungstate, nanoparticles, polaron hopping.
PACS 81.16.Be, 81.07.Bc, 73.63.Bd
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