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      Structural and phase evolution in mechanically alloyed calcium copper titanate dielectrics

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      Author
      Alizadeh, M.
      Ardakani H.A.
      Amini, R.
      Ghazanfari, M.R.
      Ghaffari, M.
      Date
      2013
      Source Title
      Ceramics International
      Print ISSN
      0272-8842
      Volume
      39
      Issue
      3
      Pages
      3307 - 3312
      Language
      English
      Type
      Article
      Item Usage Stats
      127
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      120
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      Abstract
      Nanocrystalline calcium-copper-titanate (CCTO) dielectric powders were prepared by mechanical alloying. Phase transformations and structural evolution of the mechanically activated powders were investigated through the Rietveld refinement of the X-ray diffraction results. The crystallite size, lattice strain, and weight fraction of individual phases were estimated based on crystal structure refinement. Furthermore, the microstructural properties and thermal behavior of the milled powders were investigated by Transmission Electron Microscopy (TEM) and Differential Thermal Analysis (DTA), respectively. It was found that CCTO nanocrystals can be successfully synthesized after the amorphization of the initial crystalline materials. Semi-spherical nano-size particles were developed after sufficient milling time. Formation of an amorphous phase during the milling cycle was confirmed by the presence of the glass transition and crystallization peaks in the thermal analysis profiles. © 2012 Elsevier Ltd and Techna Group S.r.l.
      Keywords
      Amorphous phase
      C. Thermal properties
      Dielectrics
      Mechanical alloying
      Amorphous phase
      Calcium copper titanates
      Crystal structure refinement
      Dielectric powders
      Lattice strain
      Mechanically alloyed
      Microstructural properties
      Milled powders
      Milling cycles
      Milling time
      Nano-size particles
      Nanocrystallines
      Phase evolutions
      Structural evolution
      Thermal behaviors
      Transmission electron microscopy tem
      Weight fractions
      Crystal structure
      Crystalline materials
      Differential thermal analysis
      Glass transition
      Mechanical alloying
      Milling (machining)
      Nanocrystalline powders
      Powders
      Rietveld refinement
      Transmission electron microscopy
      X ray diffraction
      X ray powder diffraction
      Dielectric materials
      Permalink
      http://hdl.handle.net/11693/21024
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.ceramint.2012.10.019
      Collections
      • Department of Electrical and Electronics Engineering 3597
      • Institute of Materials Science and Nanotechnology (UNAM) 1831
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