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Structural, Electrical and Dielectric Properties of Pyrochlore LaCrZr2-xGexO7 Nanospheres

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A series of pyrochlore LaCrZr2–xGexO7 (0.0 ≤ x ≤ 1.0) zirconate nanospheres have been synthesized by hydrothermal process. All the zirconate nanospheres crystallize in single phase cubic structure as confirmed by powder X-ray diffraction studies. Electrical conductivity has been analyzed in the temperature range from 300 to 673 K. The relation of DC electrical conductivity with temperature revealed a metal-to-semiconductor behavior with increase in Ge substituents concentration. Further, dielectric properties determined in the frequency range of 60 KHz to 1 MHz are in good agreement with electrical conductivity. These results indicate potential use of these zirconate spheres in switching application due to increased electrical resistivity and decreased dielectric constant on Ge substitution. AC conductivity and electric modulus Cole—Cole plots as a function of frequency reveal the dominant contribution of grain boundaries in the hoping conduction mechanism. It is also observed that the AC activation energy is lower than the DC activation energy.
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Keywords: Dielectric Measurements; Electrical Resistivity; Lanthanum Chromium Zirconates

Document Type: Research Article

Affiliations: 1: Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China 2: Department of Physics, COMSATS Institute of Information and Technology, Lahore 54000, Pakistan 3: Institute of Physics, University of Chinese Academy of Sciences, Beijing 100190, P. R. China 4: Department of Materials Science and Engineering College of Engineering, Peking University Beijing 100871, P. R. China

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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