Structural and phase evolution in mechanically alloyed calcium copper titanate dielectrics

Date
2013
Authors
Alizadeh, M.
Ardakani H.A.
Amini, R.
Ghazanfari, M.R.
Ghaffari, M.
Advisor
Instructor
Source Title
Ceramics International
Print ISSN
0272-8842
Electronic ISSN
Publisher
Volume
39
Issue
3
Pages
3307 - 3312
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
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.

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Other identifiers
Book Title
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
Citation
Published Version (Please cite this version)