Structural and Electrical Properties of Fluorine Doped (Bi, Pb)-1212 Ceramics
| Autor: | N. Mahamdioua, Ahmet Varilci, Y. Boudjadja, Cabir Terzioglu, S.P. Altintas, A. Amira, A. Saoudel, L. Amirouche |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Condensed matter physics Scanning electron microscope Doping Analytical chemistry chemistry.chemical_element Condensed Matter Physics Variable-range hopping Electronic Optical and Magnetic Materials chemistry Electrical resistivity and conductivity Phase (matter) Fluorine Charge carrier Cuprate |
| Zdroj: | Journal of Superconductivity and Novel Magnetism. 26:867-871 |
| ISSN: | 1557-1947 1557-1939 |
| DOI: | 10.1007/s10948-012-1911-8 |
| Popis: | In the aim to test the effect of fluorine doping on structural and electrical properties of semiconducting Bi(Pb)-1212 phase, bulk samples with nominal composition of Bi0.4Pb0.35Sr2Y0.8Ca0.2Cu2.05O y F x with x=0,0.2,0.4 and 0.6 are prepared in air by solid state reaction method and characterized. Similarly to other Bi-based cuprates, the scanning electron microscopy shows that fluorine doping increases the grain size of the samples. The obtained X-ray diffraction patterns are indexed in P4/mmm space group. A slight increase of cell volume by doping is revealed, a result which is in line with that seen in Y-123 compounds. Even if the resistivity decreases with fluorine content, all compounds exhibit a semiconducting behavior. The conduction mechanism obeys well to the two dimensional variable range hopping (2D-VRH) model from room temperature down to approximately 40 K. The analysis of the fitting results suggests that the improvement of electrical conduction could be due to a delocalization of charge carriers. |
| Databáze: | OpenAIRE |
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