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2008 | 6 | 4 | 849-852
Tytuł artykułu

Structural and dielectric studies of lead-free ceramics: Na1/2Y1/2TiO3

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The polycrystalline samples of Na1/2Y1/2TiO3 were prepared by the mixed-oxide method. A preliminary X-ray structural analysis was shown to exhibit the formation of a single-phase compound with an orthorhombic structure. Microstructural analysis by scanning electron microscopy (SEM) exhibits well defined grains distributed uniformly through out the sample suggesting the compactness and homogeneity of the sample. Detailed studies of dielectric properties of Na1/2Y1/2TiO3 in a wide frequency range (102–106 Hz) at different temperatures (31–500°C) show a dielectric anomaly at 105°C, which may be related to a ferroelectricparaelectric phase transition as suggested by hysteresis loop at room temperature. An ac conductivity (σ ac) of the material is mainly governed by the polaron hopping mechanism, which is also influenced by both frequency and temperature. The activation energy was obtained from the plot of temperature with a.c. conductivity.
Wydawca

Czasopismo
Rocznik
Tom
6
Numer
4
Strony
849-852
Opis fizyczny
Daty
wydano
2008-12-01
online
2008-09-27
Twórcy
autor
  • Department of Physics, Indian Institute of Technology, Kharagpur, 721 302, India
  • Department of Physics and Technophysics, Vidyasagar University, Midnapore, 721 102, India
Bibliografia
  • [1] M.E. Lines, A.M. Glass, Principles and Applications of Ferroelectrics and related materials (Oxford University press, London, 1977)
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  • [3] Q. Xu et al., Chem. Phys. 90, 111 (2005)
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  • [9] Lily, K. Kumari, K. Prasad, R.N.P. Choudhary, J. Alloys Comp. 453, 325 (2008) http://dx.doi.org/10.1016/j.jallcom.2006.11.081[Crossref]
  • [10] S.K Barik, R.N.P. Choudhary, P.K. Mahapatra, J. Mater. Sci.-Mater. El. 19, 607 (2008) http://dx.doi.org/10.1007/s10854-007-9397-z[Crossref]
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  • [14] P.R. Das, B. Behera, R.N.P. Choudhary, B.K. Samantaray, Res. Lett. Mater. Sci. 2007, 91796 (2007)
  • [15] A.K. Jonscher, Nature 267, 673 (1977) http://dx.doi.org/10.1038/267673a0[Crossref]
  • [16] V. Gupta, A. Mansingh, Phys. Rev. B 49, 1989 (1994) http://dx.doi.org/10.1103/PhysRevB.49.1989[Crossref]
  • [17] O. Raymond, R. Font, N. S. Almodovar, J. Portelles, J.M. Siqueiros, J. Appl. Phys. 97, 84107 (2005) http://dx.doi.org/10.1063/1.1870099[Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11534-008-0106-1
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