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Frequency and Si concentration dependence of dielectric spectrum of natural zeolite composites prepared by using zeolite and silicon powders

V. I. ORBUKH1, G. M. EYVAZOVA1, N. N. LEBEDEVA1, B. G. SALAMOV2,3,* , M. OZER2

Affiliation

  1. Baku State University, Institute for Physical Problems, Baku, AZ 1148 Azerbaijan
  2. Physics Department, Faculty of Sciences, Gazi University, 06500 Ankara, Turkey
  3. National Academy of Science, Institute of Physics, AZ-1143 Baku, Azerbaijan

Abstract

We present the real and imaginary part of the dielectric permittivity of natural zeolite composites prepared by using zeolite and silicon powders. The dielectric response (DR) dependences on the frequency of electric field and different Si concentrations (10-50%) are non-monotonic and a peak is observed. This peak position is practically independent on the frequency and the maximum is observed in zeolite composites which included 10% of Si-powder. Also the peak decreases by about an order of magnitude when frequency increases from 500 Hz to 5 kHz. Addition of conductive Si-particles to zeolite-powder leads to two opposite effects. Firstly, the movement of electrons in the Si-particles provides an increase of DR. Secondly, cations leaving zeolite pores can be neutralized by the particles of Si in the intercrystalline-space. Such a peculiar mechanism of recombination of Si electrons and cations from pores leads to a reduction of DR for large silicon concentrations. The contribution of free carriers in the decreasing of the DR as the frequency increases is consistent with the suggestion that the maximum peak decreases with increasing frequency..

Keywords

Nanoporous materials, Zeolite powder, Silicon powder, Frequency dependence, Dielectric properties, Si concentration.

Citation

V. I. ORBUKH, G. M. EYVAZOVA, N. N. LEBEDEVA, B. G. SALAMOV, M. OZER, Frequency and Si concentration dependence of dielectric spectrum of natural zeolite composites prepared by using zeolite and silicon powders, Optoelectronics and Advanced Materials - Rapid Communications, 10, 11-12, November–December 2016, pp.935-940 (2016).

Submitted at: Nov. 27, 2014

Accepted at: Nov. 25, 2016