Effect of Annealing Temperature on the Electric and Dielectric Properties of Se_{70}Te_{15}Bi_{15} Films

• Authors: H. Atyia
• Languages of publication: EN

Abstracts

EN

The effect of annealing at different temperatures between T_{g} and T_{c} on the AC conductivity and dielectric properties was studied for Se_{70}Te_{15}Bi_{15} films grown by thermal evaporation technique. The films were characterized by X-ray diffraction, differential thermal analysis, and energy dispersive X-ray spectroscopy. X-ray diffraction analysis shows the occurrence of amorphous to polycrystalline transformation for films annealed at annealing temperature T_{a} ≥ 473 K. AC conductivity σ_{AC}(ω) was studied as a function of T_{a}, frequencies (0.1-100 kHz) and working temperatures (303-393 K). It was found that σ_{AC}(ω) obeyed Aω^{s} law. According to the values of s and its temperature dependence, the AC conduction mechanism was determined in terms of the correlated barrier hopping and quantum mechanical tunneling models for the as deposited and annealed films, respectively. The DC and AC activation energies were determined as a function of T_{a}. Values of dielectric constant ε_1 and dielectric loss ε_2 were found to increase with increasing T_{a}. A Debye-like relaxation of dielectric behavior was observed for polycrystalline films, and was found to be a thermally activated process.

Keywords

EN

72.80.Ng; 77.22.-d

Discipline

• 77.22.-d: Dielectric properties of solids and liquids(for dielectric properties of tissues and organs, see 87.19.rf)
• 72.80.Ng: Disordered solids

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 1
• Pages: 98-104

Dates

published

2014-01

received

2013-04-10

(unknown)

2013-10-24

Contributors

author

H. Atyia

• Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt
• Physics Department, Faculty of Science, Taif University, Kingdom of Saudi Arabia

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Identifiers

DOI

10.12693/APhysPolA.125.98