Electrical conduction and dielectric properties of Bi2O3–B2O3–TeO2 glass

• Published in: Journal of materials science Vol. 49; no. 2; pp. 720 - 728
• Main Authors: Abdel-Wahab, F. A., Youssef, G. M., Abdallah, A.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 2014; Springer Nature B.V
• Subjects: Bismuth oxides; Bismuth trioxide; Boron; Boron oxides; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Composition; Conduction model; Crystallography and Scattering Methods; Dielectric properties; Electrical conduction; Electrical resistivity; Frequency analysis; Frequency ranges; Glass; Hopping conduction; Materials Science; Mathematical models; Permittivity; Polymer Sciences; Solid Mechanics; Tellurium; Tellurium dioxide; Temperature dependence; Power Exponent; B2O3; TeO2; Bi2O3; Static Dielectric Constant
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-013-7753-3

Amorphous bulk bismuth boron tellurium glass system of compositions (Bi 2 O 3 ) x (B 2 O 3 ) 0.5− x (TeO 2 ) 0.5 with x  = 0.05, 0.1, 0.2, 0.3 and 0.4 is prepared using melt quenching method. The ac and dc conductivities ( σ ac and σ dc ) of as-prepared samples are measured in the temperature range 303–373 K and displayed dielectric dispersion in the frequency range 100 Hz–5 MHz. The ac conductivity versus frequency plots were analyzed by considering a power law: σ ac α ω s ( s  ≤ 1). A comparison between values of the index s with those numerically calculated from different conduction models revealed that correlated barrier hopping is a fairly good model to describe the dominant ac conduction mechanism in the studied compositions. Besides, results of the real dielectric constant ( ε ′), loss factor ( ε ″), and loss tangent (tan δ ) together with the optical ( ε ∞ ) and static ( ε s ) dielectric constants, estimated from Cole–Cole diagrams, for the studied samples are given and discussed. Graphical Abstract Temperature dependence of the frequency exponent s for the studied amorphous bulk samples obtained from slopes of the relation ln σ ac  = f( T ). The solid curves represent the values calculated using the models: QMT, NSPT, and OLPT. The dashed curve represents the CBH model, which gives a fairly good fit with the experimental results (symbols) .