| Autor: |
Ahmed, Ehab Moustafa, Mohamed, Amaal, Youssif, M. I., El-Ghamaz, N. A., El-shabaan, M. M. |
| Zdroj: |
Journal of Materials Science: Materials in Electronics; Nov2023, Vol. 34 Issue 31, p1-13, 13p |
| Abstrakt: |
The current study focuses on the role of Y3+ ions in a glass system of the structure 70%B2O3–(30 − x)%Na2O–x%Y2O3 (with 0 ≤ x ≤ 2.5 mol%). As well as investigating their contribution to the electric conductivity, dielectric and magnetic properties. The electrical conductivity and dielectric properties are investigated in the temperature range from 330 to 530 K, and at frequency range from100 Hz to 735 kHz. The dc conductivity (σdc) is found to increase from 3.7 × 10–11 to 1.6 × 10–5 S m−1, with activation energy (ΔE) values lying between 0.52 and 1 eV. The ac conductivity (σac) is found to vary between 8.9 × 10–9 and 9.1 × 10–4 S m−1. A continuous nonlinear decrease of the frequency exponent (s) with increasing of the temperature is detected. The experimental results are fairly fitted to the correlated barrier hopping (CBH) with density of pair sites varies around 2 × 1021 eV−1 cm−3, and activation energy for relaxation increases with the increasing of Y2O3 in the glasses. Finally, the addition of Y3+ ions to the sodium borate glass is found to convert the magnetic susceptibility from para- to dia-magnetic nature. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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