Manisha Priyadarsini, Sobha Poonam Ekka, Dinesh Kumar Pati, Tanmaya Badapanda, B. Behera, R. Padhee
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引用次数: 0
Abstract
A series of novel lead free tungsten bronze (T-B) structured Ba4(La2-xBix)Fe2Nb8O30(x = 0, 0.05, 0.1, 0.15, 0.2, and 0.25) were formulated by traditional high temperature solid-state method and calcined at 1200 °C. The structural property was investigated by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Tetragonal structure was confirmed from Rietveld analysis. The scanning electron micrograph (SEM) shows uniform distribution of rod-shaped grains with less porosity. The UV–vis analysis shows that the materials have band gaps in the range 2.17–2.29 eV which makes them useful for photocatalytic applications. The dielectric measurement of the samples was carried out in a broad range of frequency as well as temperature. The impedance of the materials falling off with the rise in temperature showing their negative temperature coefficient (NTCR) behavior. The variation of polarization with electric field confirms the ferroelectric nature of the samples.
采用传统的高温固态法配制了一系列新型无铅钨青铜(T-B)结构 Ba4(La2-xBix)Fe2Nb8O30(x = 0、0.05、0.1、0.15、0.2 和 0.25),并在 1200 °C 煅烧。通过 X 射线衍射(XRD)和傅立叶变换红外光谱(FTIR)对其结构特性进行了研究。通过里特维尔德分析,确认了四边形结构。扫描电子显微镜(SEM)显示,棒状晶粒分布均匀,孔隙率较低。紫外-可见光分析表明,这些材料的带隙在 2.17-2.29 eV 范围内,因此可用于光催化应用。样品的介电测量是在很宽的频率和温度范围内进行的。材料的阻抗随着温度的升高而下降,显示出它们的负温度系数(NTCR)特性。极化随电场的变化证实了样品的铁电性质。
期刊介绍:
The Brazilian Journal of Physics is a peer-reviewed international journal published by the Brazilian Physical Society (SBF). The journal publishes new and original research results from all areas of physics, obtained in Brazil and from anywhere else in the world. Contents include theoretical, practical and experimental papers as well as high-quality review papers. Submissions should follow the generally accepted structure for journal articles with basic elements: title, abstract, introduction, results, conclusions, and references.