Research Article
Ionic Conductivity and Structural Evolution in
Na2B4O7–Bi2O3 Glasses: Influence of Bi2O3 Content and Temperature
Kuchakshoev Davlatnazar Sohibnazarovich*
,
Dzhaborov Alexander Gulyamovich,
Kholov Alimakhmad
Issue:
Volume 11, Issue 2, June 2026
Pages:
16-25
Received:
3 January 2026
Accepted:
17 January 2026
Published:
2 June 2026
DOI:
10.11648/j.wjap.20261102.11
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Abstract: This study investigates the temperature-dependent electrical conductivity of glassy materials with compositions α·Bi2O3 + (1–α)·Na2B4O7, where the Bi2O3 content varies from 10 to 30 mol.%. The motivation for this work arises from the growing interest in Bi2O3-containing borate glasses as potential ionic conductors for electronic and photonic applications, as well as from the need to clarify the mechanisms governing charge transport in these systems. Electrical conductivity measurements were performed under controlled heating conditions with a constant heating rate, ensuring high reproducibility and reliability of the experimental data. The temperature dependence of conductivity was analyzed over a broad temperature range extending from ambient conditions up to approximately 680 K. In the low-temperature region (up to 420–450 K), only minor changes in conductivity were observed, indicating limited mobility of charge carriers and the dominance of localized transport processes. At higher temperatures, a pronounced increase in conductivity occurs, which is attributed to the thermally activated migration of mobile ions. The analysis of the conductivity data demonstrates that sodium ions act as the dominant charge carriers in the investigated compositions. This conclusion is supported by the characteristic Arrhenius-type behavior at elevated temperatures and by the absence of features typical for electronic conduction. Visual inspection of the samples after electrical measurements, complemented by scanning electron microscopy, confirms the preservation of the glassy state and supports the predominance of ionic conduction mechanisms. The results reveal a strong dependence of electrical conductivity on Bi2O3 concentration, reflecting composition-induced structural modifications of the glass network that influence ion mobility. Overall, the present study provides new insights into ion-transport mechanisms in Bi2O3–Na2B4O7 glasses and highlights the critical role of glass composition in controlling their temperature-dependent electrical properties.
Abstract: This study investigates the temperature-dependent electrical conductivity of glassy materials with compositions α·Bi2O3 + (1–α)·Na2B4O7, where the Bi2O3 content varies from 10 to 30 mol.%. The motivation for this work arises from the growing interest in Bi2O3-containing borate glasses as potential ionic conductors for electronic and photonic applic...
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