Impedance Spectroscopy Properties of Pr0.67A0.33MnO3 (A = Ba or Sr) Perovskites

被引：36

作者：

Hcini, S. ^{[1
]}

Khadhraoui, S. ^{[1
]}

Triki, A. ^{[2
]}

Zemni, S. ^{[1
]}

Boudard, M. ^{[3
]}

Oumezzine, M. ^{[1
]}

机构：

[1] Univ Monastir, Fac Sci Monastir, Dept Phys, Lab Physicochim Mat, Monastir 5019, Tunisia

[2] Univ Sfax, Fac Sci Sfax, Lab Mat Composites Ceram & Polymeres, Sfax, Tunisia

[3] MINATEC, Grenoble INP, CNRS, Lab Mat & Genie Phys,UMR 5628, F-38016 Grenoble 1, France

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2014年 / 27卷 / 01期

关键词：

Perovskites; Dielectric properties; Impedance spectroscopy; Grains and grain boundaries effects; AC ELECTRICAL-CONDUCTIVITY; COMPLEX IMPEDANCE; TRANSPORT-PROPERTIES; CONSTANT; MAGNETORESISTANCE; CAPACITANCE; RELAXATION; CHARGE; LN;

D O I：

10.1007/s10948-013-2240-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the dielectric properties of Pr0.67Ba0.33MnO3 (PBMO) and Pr0.67Sr0.33MnO3 (PSMO) perovskites synthesized by the solid-state reaction method at 1473 K. Samples were characterized by complex impedance spectroscopy (CIS) in the frequency range from 40 Hz to 1 MHz, at room temperature. The conductivity curves for the two samples were well fitted by the Jonscher law sigma(omega)=sigma (dc) +A omega (n) . For the PBMO sample, the hopping process occurs at long distance, whereas for PSMO compound it occurs between neighboring sites. Frequency dependence of dielectric constant (epsilon aEuro(3)) and tangent loss (tan delta) show a dispersive behavior at low frequencies that was explained on the basis of the Maxwell-Wagner model and Koop's theory. Electric modulus formalism has been employed to study the relaxation dynamics of charge carriers. For both compounds, the variation of the imaginary part ZaEuro(3) shows a peak at a relaxation angular frequency (omega (r) ) related to the relaxation time (tau) by tau=1/omega (r) . Nyquist plots of impedance show the presence of two semicircles and an electrical equivalent circuit has been proposed to explain the impedance results.

引用

页码：195 / 201

页数：7

共 37 条

[1] The ac electrical conductivity for Co-substituted SbNi ferrites [J].

Ahmed, MA ;

ElHiti, MA ;

ElNimr, MK ;

Amer, MA .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1996, 152 (03) :391-395

[2] Magnetocaloric properties in Ln0.67Ba0.33Mn1-xFexO3 (Ln = La or Pr) manganites [J].

Baazaoui, M. ;

Boudard, M. ;

Zemni, S. .

MATERIALS LETTERS, 2011, 65 (14) :2093-2095

[3]

Barsoukov E, 2005, IMPEDANCE SPECTROSCOPY: THEORY, EXPERIMENT, AND APPLICATIONS, 2ND EDITION, P1, DOI 10.1002/0471716243

[4] Complex impedance studies of sodium pyrotungstate -: Na2W2O7 [J].

Chatterjee, S ;

Mahapatra, PK ;

Choudhary, RNP ;

Thakur, AK .

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 2004, 201 (03) :588-595

[5] Electrical and dielectric properties of the Ca2MnO4-δ system [J].

Chihaoui, N. ;

Dhahri, R. ;

Bejar, M. ;

Dhahri, E. ;

Costa, L. C. ;

Graca, M. P. F. .

SOLID STATE COMMUNICATIONS, 2011, 151 (19) :1331-1335

[6] On the intrinsic coupling between constant-phase element parameters α and Q in electrochemical impedance spectroscopy [J].

Cordoba-Torres, P. ;

Mesquita, T. J. ;

Devos, O. ;

Tribollet, B. ;

Roche, V. ;

Nogueira, R. P. .

ELECTROCHIMICA ACTA, 2012, 72 :172-178

[7]

Donald J. R. Mac, 1987, IMPEDANCE SPECTROSCO

[8]

ElHiti MA, 1996, J PHYS D APPL PHYS, V29, P501, DOI 10.1088/0022-3727/29/3/002

[9] JUMP RELAXATION IN SOLID ELECTROLYTES [J].

FUNKE, K .

PROGRESS IN SOLID STATE CHEMISTRY, 1993, 22 (02) :111-195

[10]

Ganguli M, 1999, PHYS CHEM GLASSES, V40, P297

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