Frequency dependent electrical properties of Na2Pb2R2W2Ti4Nb4O30 (R = Nd, Sm) ceramics

doi:10.1007/s40145-014-0112-2

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Abstract

In the present research work, frequency dependent electrical properties of tungsten bronze structured compounds Na₂Pb₂R₂W₂Ti₄Nb₄O₃₀ (R = Nd, Sm) are reported. X-ray diffraction (XRD) study of polycrystalline ceramic samples confirms the formation of compounds with orthorhombic structure. Analysis of frequency dependent electrical data in the framework of modulus and conductivity formalism suggests the presence of thermally activated relaxation process in the compounds, which show Arrhenius behavior. The magnitudes of activation energies give the nature of the relaxing species. The real and imaginary parts of complex modulus trace the depressed semicircle in complex plane, suggesting non-Debye type relaxation process in the materials. The power law behavior of admittance data is successfully modeled by introducing constant phase element (CPE) to the equivalent circuit. A large value of power law parameter (n) of CPE below ferroelectric transition temperature (T_c) is attributed to the cooperative response of the dipoles which is reduced above T_c. This behavior is correlated with the frequency dependence of CPE, suggesting a physical meaning to it. The frequency dependent AC conductivity at different temperatures follows Jonscher’s universal power law. Almond and West formalism is used to estimate the hopping rate, activation enthalpy and charge carrier concentration in the materials.

Key words： ceramics electrical properties microstructure electrical conductivity

Received: 15 March 2014 Published: 11 June 2015

Corresponding Authors: Piyush R. DAS

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	Lalatendu BISWAL
	Piyush R. DAS
	Banarji BEHERA

Cite this article:

Lalatendu BISWAL,Piyush R. DAS,Banarji BEHERA. Frequency dependent electrical properties of Na₂Pb₂R₂W₂Ti₄Nb₄O₃₀ (R = Nd, Sm) ceramics[J]. Journal of Advanced Ceramics, 2014, 3(3): 215-223.

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http://jac.tsinghuajournals.com/EN/10.1007/s40145-014-0112-2 OR http://jac.tsinghuajournals.com/EN/Y2014/V3/I3/215

Variations of real and imaginary parts of complex modulus with frequency for (a) NPNWTN and (b) NPSWTN.

Variation of relaxation time with temperature for NPNWTN and NPSWTN.

Spectroscopic plots of complex modulus (real and imaginary parts) of (a) NPNWTN and (b) NPSWTN at different temperatures.

Equivalent circuits for (a) bulk response alone and (b) bulk and grain boundary response.

Values of Y0 and n for NPSWTN and NPNWTN at different temperatures

Spectroscopic plots of complex admittance data (real and imaginary parts) at two different temperatures for (a) NPNWTN and (b) NPSWTN. Solid lines represent fitted data.

Variations of AC conductivity σ_AC with frequency for (a) NPNWTN and (b) NPSWTN at different temperatures.

ωp) and charge carrier concentration term (K′) with temperature for (a) NPNWTN and (b) NPSWTN.">

Variations of hopping rate (ωp) and charge carrier concentration term (K′) with temperature for (a) NPNWTN and (b) NPSWTN.

[1]	Rubin JJ, Van Uitert LG, Levinstein HJ. The growth of single crystal niobates for electro-optic and non-linear applications. J Cryst Growth 1967, 1:315-317.
[2]	Stenger CGF, Burggraaf AJ. Study of phase transitions and properties of tetragonal (Pb, La)(Zr, Ti)O3 ceramics—III: Transitions induced by electric fields. J Phys Chem Solids 1980, 41:31-41.
[3]	Behera B, Nayak P, Choudhary RNP. Structural, dielectric and electrical properties of NaBa2X5O15 (X = Nb and Ta) ceramics. Mater Lett 2005, 59:3489-3493.
[4]	Mohanty BB, Sahoo PS, Sahoo MPK, et al. Structural and electrical properties of Ba3Sr2GdTi3V7O30. Adv Mat Lett 2012, 3:305-308.
[5]	Chen XM, Sun YH, Zheng XH. High permittivity and low loss dielectric ceramics in the BaO–La2O3–TiO2–Ta2O5 system. J Eur Ceram Soc 2003, 23:1571-1575.
[6]	Fang L, Chen L, Zheng H, et al. Structural and dielectric properties of Ba5LnSn3Nb7O30 (Ln = La, Nd) ceramics. Mater Lett 2004, 58:2654-2657.
[7]	Behera B, Nayak P, Choudhary RNP. Study of complex impedance spectroscopic properties of LiBa2Nb5O15 ceramics. Mater Chem Phys 2007, 106:193-197.
[8]	Macdonald JR. Impedance Spectroscopy. New York:Wiley, 1987.
[9]	Almond DP, West AR. Impedance and modulus spectroscopy of “real” dispersive conductors. Solid State Ionics 1983, 11:57-64.
[10]	Jonscher AK. The ‘universal’ dielectric response. Nature 1977, 267:673-679.
[11]	Ngai KL, White CT. Frequency dependence of dielectric loss in condensed matter. Phys Rev B 1979, 20:2475.
[12]	Dissado LA, Hill RM. Non-exponential decay in dielectrics and dynamics of correlated systems. Nature 1979, 279:685-689.
[13]	West AR, Sinclair DC, Hirose N. Characterization of electrical materials, especially ferroelectrics, by impedance spectroscopy. J Electroceram 1997, 1:65-71.
[14]	Abouzari MRS, Berkemeier F, Schmitz G, et al. On the physical interpretation of constant phase elements. Solid State Ionics 2009, 180:922-927.
[15]	Kaplan T, Gray LJ, Liu SH. Self-affine fractal model for a metal-electrolyte interface. Phys Rev B 1987, 35:5379.
[16]	Maitra MG, Sinha M, Mukhopadhyay AK, et al. Ion-conductivity and Young’s modulus of the polymer electrolyte PEO–ammonium perchlorate. Solid State Ionics 2007, 178:167-171.
[17]	Zhang Y, Huang Y, Wang L. Study of EVOH based single ion polymer electrolyte: Composition and microstructure effects on the proton conductivity. Solid State Ionics 2006, 177:65-71.
[18]	Das PR, Choudhary RNP, Samantray BK. Diffuse ferroelectric phase transition in Na2Pb2Sm2W2Ti4Nb4O30 ceramics. Mater Chem Phys 2007, 101:228-233.
[19]	Das PR, Choudhary RNP, Samantray BK. Diffuse ferroelectric phase transition in Na2Pb2Nd2W2Ti4Nb4O30 ceramic. J Alloys Compd 2008, 448:32-37.
[20]	Hodge IM, Ingram MD, West AR. Impedance and modulus spectroscopy of polycrystalline solid electrolytes. J Electroanal Chem Interfacial Electroch 1976, 74:125-143.
[21]	Irvine JTS, Sinclair DC, West AR. Electroceramics: Characterization by impedance spectroscopy. Adv Mater 1990, 2:132-138.
[22]	Das PS, Chakraborty PK, Behera B, et al. Electrical properties of Li2BiV5O15 ceramics. Physica B 2007, 395:98-103.
[23]	Rao KS, Krishna PM, Prasad DM, et al. Modulus spectroscopy of lead potassium titanium niobate (Pb0.95K0.1Ti0.25Nb1.8O6) ceramics. J Mater Sci 2007, 42:4801-4809.
[24]	Ngai RL, León C. Recent advances in relating macroscopic electrical relaxation data to microscopic movements of the ions in ionically conducting materials. Solid State Ionics 1999, 125:81-90.
[25]	Barker AS, Ditzenberger JA, Remeika JP. Lattice vibrations and ion transport spectra in β-alumina. II. Microwave spectra. Phys Rev B 1976, 14:4254.
[26]	Masó N, Yue XY, Goto T, et al. Frequency-dependent electrical properties of ferroelectric BaTi2O5 single crystal. J Appl Phys 2011, 109:024107.
[27]	Funke K. Jump relaxation in solid electrolytes. Prog Solid State Ch 1993, 22:111-195.
[28]	Sen S, Choudhary RNP. Impedance studies of Sr modified BaZr0.05Ti0.95O3 ceramics. Mater Chem Phys 2004, 87:256-263.
[29]	Zheludev IS. Physics of Crystalline Dielectrics. Vol. 2 Electrical Properties. New York–London:Plenum Press, 1971.
[30]	Varada Rajulu KC, Tilak B, Rao KS. Electricalconductivity and dielectric properties of Bi0.5(Na0.7K0.2Li0.1)0.5TiO3 ceramic material. American Journal of Materials Science 2012, 2:15-21.