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Influence of pressure on the impedance of SnO2 nanopowder

MUHAMMAD TARIQ SAEED CHANI1,2,* , SHER BAHADAR KHAN1,2, ABDULLAH M. ASIRI1,2, KH. S. KARIMOV3,6, M. ABID4, M. MEHRAN BASHIR3, KALSOOM AKHTAR5

Affiliation

  1. Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah21589, Saudi Arabia
  2. Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
  3. GIK Institute of Engineering Sciences and Technology, Topi 23640, KPK, Pakistan
  4. Interdisciplinary Research Center, COMSATS Institute of Information Technology, G.T. Road, Wah Cantt, Pakistan
  5. Division of Nano Sciences and Department of Chemistry, Ewha Womans University, Seoul, Korea
  6. Physical Technical Institute of Academy of Sciences, Dushanbe 734025, Tajikistan

Abstract

In this paper, the influence of pressure on the impedance and resistance of SnO2 nanopowder has been investigated. A transducer is fabricated for the direct measurement of impedance-pressure relationships on nanopowder. At initial conditions, the diameter and the height of nanopowder samples placed in the transducer are 10 mm and 3 mm, respectively. Under pressure of up to 8.15kN/m2, the DC resistance and the impedance decrease on average up to 22% in the frequency range of 100 Hz to 200 kHz. This decrease in resistance and impedance may be regarded to the densification of samples and decrease in porosity under pressure. These impedance-pressure and resistance-pressure relationships are quasi-linear and it is also observed that the DC resistance increases with time and gets saturated within 5 minutes. This phenomenon is regarded to the effect of displacement currents of bound charges. The resistance-pressure relationship is simulated and the dependence of impedance phase (θ) on the frequency and pressure is also investigated..

Keywords

Impedance, Tine oxide, Nanopowder, Pressure, Transducer.

Citation

MUHAMMAD TARIQ SAEED CHANI, SHER BAHADAR KHAN, ABDULLAH M. ASIRI, KH. S. KARIMOV, M. ABID, M. MEHRAN BASHIR, KALSOOM AKHTAR, Influence of pressure on the impedance of SnO2 nanopowder, Optoelectronics and Advanced Materials - Rapid Communications, 9, 1-2, January-February 2015, pp.114-119 (2015).

Submitted at: May 31, 2014

Accepted at: Jan. 21, 2015