Structural, Optical and Electrical Characteristics of a La0.5K0.5Ga0.5V0.5O3 System

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• 作者：Truptimayee Acharya ; R. N. P. Choudhary
• 关键词：X ; ray diffraction ; infrared spectroscopy ; dielectric properties ; conductivity ; ferroelectricity
• 刊名：Journal of Electronic Materials
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：45
• 期：2
• 页码：947-958
• 全文大小：1,916 KB
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• 作者单位：Truptimayee Acharya (1)
  R. N. P. Choudhary (1)
  
  1. Department of Physics, Institute of Technical Education & Research, Siksha ‘O’ Anusandhan University, Khandagiri, Bhubaneswar, 751030, Odisha, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  Electronics, Microelectronics and Instrumentation
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Boston
• ISSN：1543-186X

文摘

The polycrystalline sample of La_0.5K_0.5Ga_0.5V_0.5O₃ (LKGVO) was prepared using a high-temperature solid-state reaction technique. X-ray structural analysis of the sample confirmed the formation of a single-phase compound in an orthorhombic crystal system. Preliminary molecular structural analysis using infrared (IR) spectroscopy further supports the formation of a single-phase compound. The optical indirect band gaps in LKGVO were obtained from the ultraviolet–visible light (UV–Vis) absorption spectral analysis. The micro-structural study on the LKGVO pellet sample by scanning electron microscopy shows that well-defined grains are distributed uniformly throughout the surface of the sample. Detailed studies of dielectric and impedance parameters as a function of temperature and frequency have shown the significant effect of grains and grain boundaries in the relaxation process. A I–V characteristic of the material shows a negative temperature co-efficient of resistance which is similar to that of a semi-conductor. Based on the appearance of a distinct dielectric anomaly and an unsaturated P–E hysteresis loop, like many other compounds, the existence of ferroelectricity in the compound can be expected in spite of it having moderate ionic conductivity. Keywords X-ray diffraction infrared spectroscopy dielectric properties conductivity ferroelectricity