Dielectric and ferroelectric properties of CoCr2O4 nanoceramics

被引：21

作者：

Choudhary, Pankaj ^{[1
]}

Saxena, P. ^{[1
]}

Yadav, A. ^{[1
,2
]}

Rai, V. N. ^{[1
]}

Mishra, A. ^{[1
]}

机构：

[1] Devi Ahilya Univ, Sch Phys Vigyan Bhawan, Mat Sci Lab, Khandwa Rd Campus, Indore 452001, Madhya Pradesh, India

[2] Medi Caps Univ Pigdamber, Dept Phys, Indore 453331, Madhya Pradesh, India

来源：

JOURNAL OF ADVANCED DIELECTRICS | 2019年 / 9卷 / 03期

关键词：

CoCr2O4; nanoceramics; synchrotron X-ray diffraction; dielectric spectroscopy; electric polarization; leakage current behavior; BEHAVIOR;

D O I：

10.1142/S2010135X19500152

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

CoCr2O4 nanoceramics are prepared by sol-gel auto combustion method. Synchrotron X-ray diffraction analysis affirms the single-phase pristine cubic structure with space group Fd3m. Debye-Scherrer method estimates the crystallite size of main intense peak to be similar to 27.15 nm. Prominent bands obtained in infrared spectra at 448 and 599 cm(-1) are due to metal-oxygen stretching bond present at tetrahedral and octahedral sites. Dielectric parameters decrease as frequency increases from 10(3) to 10(6) Hz that can be interpreted by Maxwell-Wagner-type interfacial polarization. Complex impedance spectra (Nyquist plot) reveal arc like behavior, which is mainly due to intergrain (grain boundary) resistance that also exhibits conducting nature of the nanoceramics. Weak ferroelectricity is mainly associated with the partial reversal of the polarization. Leakage current behavior follows the Ohmic and Child square law. Electron conduction process was interpreted by space-charge limited current (SCLC) mechanism. Leakage current behavior observed in cobalt chromite nanoceramics is mainly attributed to the oxygen vacancies.

引用

页数：7

共 26 条

[1]

Carbone B. K. Kotowska, 2005, PHYS REV LETT, V95

[2] Structural, vibrational and dielectric behavior of Co1-xMxCr2O4 (M = Zn, Mg, Cu and x=0.0, 0.5) spinel chromites [J].

Choudhary, Pankaj ;

Varshney, Dinesh .

JOURNAL OF ALLOYS AND COMPOUNDS, 2017, 725 :415-424

[3] Frequency and voltage dependent profile of dielectric properties, electric modulus and ac electrical conductivity in the PrBaCoO nanofiber capacitors [J].

Demirezen, S. ;

Kaya, A. ;

Yeriskin, S. A. ;

Balbasi, M. ;

Uslu, I. .

Results in Physics, 2016, 6 :180-185

[4]

Elakrmi E, 2012, AKADEMEIA, V2

[5] A high efficiency CoCr2O4/carbon nanotubes nanocomposite electrocatalyst for dye-sensitised solar cells [J].

Guo, Mingxing ;

Tang, Beibei ;

Zhang, Haimin ;

Yin, Shuhui ;

Jiang, Wei ;

Zhang, Yiming ;

Li, Mengying ;

Wang, Hui ;

Jiao, Liqi .

CHEMICAL COMMUNICATIONS, 2014, 50 (55) :7356-7358

[6] Catalytic activity of spinel oxides MgCr2O4 and CoCr2O4 for methane combustion [J].

Hu, Jianan ;

Zhao, Wenyan ;

Hu, Ruisheng ;

Chang, Guiying ;

Li, Chun ;

Wang, Lingjie .

MATERIALS RESEARCH BULLETIN, 2014, 57 :268-273

[7] Synthesis of CoxMg1-xAl2O4 nanospinel pigments by microwave combustion method [J].

Khattab, R. M. ;

Sadek, H. E. H. ;

Gaber, A. A. .

CERAMICS INTERNATIONAL, 2017, 43 (01) :234-243

[8]

Khomskii D., 2009, PHYSICS, V2, P20, DOI [10.1103/Physics.2.20, DOI 10.1103/PHYSICS.2.20]

[9] ON THE DISPERSION OF RESISTIVITY AND DIELECTRIC CONSTANT OF SOME SEMICONDUCTORS AT AUDIOFREQUENCIES [J].

KOOPS, CG .

PHYSICAL REVIEW, 1951, 83 (01) :121-124

[10] SIMPLIFIED THEORY OF SPACE-CHARGE-LIMITED CURRENTS IN AN INSULATOR WITH TRAPS [J].

LAMPERT, MA .

PHYSICAL REVIEW, 1956, 103 (06) :1648-1656

← 1 2 3 →