Ba1-xNaxCoO3(x=0.25,0.5,0.75)化合物的结构、磁性和电性能研究

IF 0.3 Q4 ENGINEERING, MULTIDISCIPLINARY UIS Ingenierias Pub Date : 2021-07-06 DOI:10.18273/revuin.v20n4-2021010
Carlos Augusto Estrada-Rodriguez, Lutiene Fernandes-Lopes, Rovan Fernandes-Lopes, Fabiano Mesquita, Águeda Maria Turatti, Jorge Luiz Pimentel-Junior, Santiago Sandoval-Gutiérrez, C. A. Parra Vargas
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引用次数: 0

摘要

具有金属-绝缘体过渡的钴酸盐类材料在消费电子市场中是相关的。在这项工作中,我们介绍了Ba1-xNaxCoO3(x=0.25,0.5,0.75)钴酸盐的结构、磁性和电学性质。所有样品均采用固态反应工艺合成。通过Rietveld方法使用X射线衍射(XRD)数据测定了它们的晶体结构,结果表明所有样品都在正交空间群C2221(N°20)中结晶。用扫描电子显微镜(SEM)对烧结样品的微观结构进行了表征。磁化率测量证实了在所使用的温度范围内x≥0.5的顺磁行为。同样,在样品x=0.25中,在33K附近观察到宽峰,并且观察到反铁磁行为的特征。另一方面,电阻率有助于确定样品的绝缘行为,其中x=0.5和x=0.75。相反,在低钠含量(x=0.25)下,观察到金属-绝缘体转变,转变温度接近105K。
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Un estudio de las propiedades estructurales, magnéticas y eléctricas de los compuestos Ba1-xNaxCoO3(x = 0.25, 0.5, 0.75)
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.
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来源期刊
UIS Ingenierias
UIS Ingenierias ENGINEERING, MULTIDISCIPLINARY-
自引率
33.30%
发文量
27
审稿时长
12 weeks
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