Structural, dielectric and impedance properties of Ca(Fe 2/3W 1/3)O 3 nanoceramics
The polycrystalline nanoceramics (∼60 nm) of Ca(Fe 2/3W 1/3)O 3 (CFW) were synthesized by mechanochemical and solid-state reaction techniques. Preliminary X-ray structural analysis of CFW suggested the formation of single-phase compound in tetragonal crystal system (distorted structure of ideal pero...
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Published in | Physica. B, Condensed matter Vol. 393; no. 1; pp. 24 - 31 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
30.04.2007
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Subjects | |
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Abstract | The polycrystalline nanoceramics (∼60
nm) of Ca(Fe
2/3W
1/3)O
3 (CFW) were synthesized by mechanochemical and solid-state reaction techniques. Preliminary X-ray structural analysis of CFW suggested the formation of single-phase compound in tetragonal crystal system (distorted structure of ideal perovskite). The large distortion (∼16%) is supported by a large deviation of tolerance factor
t=0.86 from unity (for ideal perovskite). The SEM micrograph shows the polycrystalline nature of the sample with different grain sizes, which are inhomogeneously distributed through the sample surface. Detailed studies of dielectric and impedance properties of the material in a wide range of frequency (1
kHz–1
MHz) and temperatures (300–630
K) show that these properties are strongly temperature and frequency dependent. The nature of variation of AC conductivity exhibits a progressive increase in AC conductivity on increasing temperature. The oxygen vacancies, space charge and mobile charge carriers play an important role in relaxation and conduction process. The relaxation process in the material was found to be of non-Debye type. |
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AbstractList | The polycrystalline nanoceramics (∼60
nm) of Ca(Fe
2/3W
1/3)O
3 (CFW) were synthesized by mechanochemical and solid-state reaction techniques. Preliminary X-ray structural analysis of CFW suggested the formation of single-phase compound in tetragonal crystal system (distorted structure of ideal perovskite). The large distortion (∼16%) is supported by a large deviation of tolerance factor
t=0.86 from unity (for ideal perovskite). The SEM micrograph shows the polycrystalline nature of the sample with different grain sizes, which are inhomogeneously distributed through the sample surface. Detailed studies of dielectric and impedance properties of the material in a wide range of frequency (1
kHz–1
MHz) and temperatures (300–630
K) show that these properties are strongly temperature and frequency dependent. The nature of variation of AC conductivity exhibits a progressive increase in AC conductivity on increasing temperature. The oxygen vacancies, space charge and mobile charge carriers play an important role in relaxation and conduction process. The relaxation process in the material was found to be of non-Debye type. |
Author | Bonilla, G.E. Katiyar, R.S. Pradhan, Dillip K. Tirado, C.M. Choudhary, R.N.P. |
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Keywords | 77.22.−d Dielectric constant 73.61.Tm Impedance analysis AC conductivity 77.22.Gm X-ray diffraction Ceramics 61.10.−i |
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Snippet | The polycrystalline nanoceramics (∼60
nm) of Ca(Fe
2/3W
1/3)O
3 (CFW) were synthesized by mechanochemical and solid-state reaction techniques. Preliminary... |
SourceID | elsevier |
SourceType | Publisher |
StartPage | 24 |
SubjectTerms | AC conductivity Ceramics Dielectric constant Impedance analysis X-ray diffraction |
Title | Structural, dielectric and impedance properties of Ca(Fe 2/3W 1/3)O 3 nanoceramics |
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