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Substantial Morphological Changes and Low-Temperature Dielectric Response of α-MoO3 Nanosheets after Thermal Treatment

  • A. M. BadrEmail author
  • H. H. Afify
  • H. A. Elshaikh
  • E. H. El-Anssary
Article
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Abstract

Molybdenum trioxide nanocrystals have been synthesized using a hydrothermal route. The resulting powder samples were postannealed at different temperatures (500°C, 550°C, and 600°C) to provide insight into the effects on their structural and morphological properties. x-Ray diffraction (XRD) analysis revealed that all the powders crystallized as pure single-phase α-MoO3 nanocrystals. The intensity of the characteristic peaks increased slightly with increase of the postannealing temperature from 500°C to 600°C, indicating improved crystallinity of the α-MoO3. Scanning electron microscopy (SEM) analysis of the powder samples revealed substantial morphological changes when changing the postannealing temperature from 500°C to 600°C, with high-quality α-MoO3 nanosheets being obtained after postannealing at 600°C. This high-crystallinity powder was pelletized into a disk-shaped sample (CPS600) to explore the mechanisms of electrical conduction in an alternating-current (AC) electric field. The effects of both the working temperature and frequency of the AC field on the dielectric response of the CPS600 disk samples were elucidated and analyzed, then their AC electrical conductivity was investigated in the same regions of working temperature and applied frequency.

Keywords

Hydrothermal synthesis thermodynamically stable α-MoO3 phase microstructural properties morphological features electrical conduction mechanisms 

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Department of Physics, Faculty of ScienceAswan UniversityAswânEgypt
  2. 2.Department of Solid State PhysicsNational Research CenterCairoEgypt
  3. 3.Research Center for NanoMaterial Studies and Their Promising TechnologiesAswânEgypt

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