4.5 Article

The Effect of Alkaline Earth (Ba, Sr and Ca) Doped Iron Bismuth Glasses on the Structural, Thermoelectric and Electrical Properties

Publisher

SPRINGER
DOI: 10.1007/s10904-021-02141-8

Keywords

Iron bismuth glasses; Thermoelectric power; Small polaron hopping

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The study revealed that glasses containing iron and bismuth elements have good solubility and electrical properties, with glasses containing Sr showing particularly interesting electrical characteristics.
Glasses with nominal composition 70Bi(2)O(3)-30Fe(2)O(3) and 10X-60Bi(2)O(3)-30Fe(2)O(3) (mol%); (X = Ba, Sr and Ca) were prepared by the conventional melt quenching technique. X-ray diffraction and differential scanning calorimeter confirm the amorphous nature of the glass samples. The iron-bismuth glass shows good solubility of alkaline earth elements ions. In temperatures range of 310-450 K, the de conductivity of the glass samples containing alkaline earth elements enhanced. Glass sample containing Sr shows interesting electrical properties. All glass samples showed a transition from negative to positive Seebeck coefficient, this means that the conduction is mixed of electrons and holes charge carriers. The conduction mechanism of all samples obeys non-adiabatic small polaron hopping model of electron between iron ions. The calculated small polaron coupling constant, (gamma(p)) was found to be in the range of 10.25-17.28. Also, the calculated hopping mobility (mu) and carrier density (N-c) of glasses were in the range of 4.65 x10(-7) to 4.11 x10(-3), ( cm(2) V-1 s(-1)) and 0.029-10 (x10(17) cm (-3)) at 333 K, respectively. The conductivity of the present glasses was primarily determined by hopping carrier mobility.

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