1. A study of the structural, magnetic, and electrical properties of Ba1-xNaxCoO3 compounds (x = 0.25, 0.5, 0.75).
- Author
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Estrada-Rodríguez, Carlos A., Fernandes-Lopes, Lutiene, Fernandes-Lopes, Rovan, Mesquita, Fabiano, Turatti, Águeda M., Pimentel-Junior, Jorge L., Sandoval-Gutiérrez, Santiago, and Parra-Vargas, Carlos A.
- Subjects
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METAL-insulator transitions , *SPACE groups , *TRANSITION temperature , *RIETVELD refinement , *MAGNETIC susceptibility , *TRANSITION metals - Abstract
Cobaltite-like materials having metal-insulator transitions are relevant in the consumer electronics market. In this work, we present the structural, magnetic, and electrical properties of Ba1-xNaxCoO3 (with x = 0.25, 0.5, 0.75) cobaltite. All samples were synthesized using a solid-state reaction process. Their crystal structure was determined using X-ray diffraction (XRD) data by the Rietveld method, which showed that all the samples were crystallized in the orthorhombic space group C2221 (N.° 20). The microstructure of the sintered samples was characterized by scanning electron microscopy (SEM). The magnetic susceptibility measurements confirmed a paramagnetic behavior for x ≥ 0.5 in the temperature range that was used. Likewise, a broad peak around 33 K in the sample x = 0.25, and characteristic of antiferromagnetic behaviors were observed. On the other hand, resistivity contributed to determining the insulating behavior of samples where x = 0.5 and x = 0.75. In contrast, at low sodium content (x = 0.25), a metal-insulator transition was observed with transition temperature near 105 K. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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