Dielectric and electrical studies of Pr3+ doped nano CaSiO3 perovskite ceramics

被引：30

作者：

Kulkarni, Sandhya ^{[1
]}

Nagabhushana, B. M. ^{[2
]}

Parvatikar, Narsimha ^{[3
]}

Koppalkar, Anilkumar ^{[4
]}

Shivakumara, C. ^{[5
,6
]}

Damle, R. ^{[1
]}

机构：

[1] Bangalore Univ, Dept Phys, Bangalore 560056, Karnataka, India

[2] MS Ramaiah Inst Technol, Dept Chem, Bangalore 560056, Karnataka, India

[3] APS Coll Engn, Dept Phys, Bangalore 560082, Karnataka, India

[4] SS Margol Coll, Dept Phys, Shahabad 585228, India

[5] Indian Inst Sci, Dept Solid State, Bangalore 560012, Karnataka, India

[6] Indian Inst Sci, Struct Chem Unit, Bangalore 560012, Karnataka, India

来源：

MATERIALS RESEARCH BULLETIN | 2014年 / 50卷

关键词：

Nanoceramics; Perovskites; Dielectric properties; Electric modulus; AC conductivity; IMPEDANCE SPECTROSCOPY; PERMITTIVITY;

D O I：

10.1016/j.materresbull.2013.10.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

CaSiO3 nano-ceramic powder doped with Pr3+ has been prepared by solution combustion method. The powder Ca0.5Pr0.05SiO3 is investigated for its dielectric and electrical properties at room temperature to study the effect of doping. The sample is characterized by X-ray diffraction and infrared spectroscopy. The size of either of volume elements of CaSiO3:Pr3+ estimated from transmission electron microscopy is about 180-200 nm. The sample shows colossal dielectric response at room temperature. This colossal dielectric behaviour follows Debye-type relaxation and can be explained by Maxwell-Wagner (MW) polarization. However, analysis of impedance and electric modulus data using Cole-Cole plot shows that it deviates from ideal Debye behaviour resulting from the distribution of relaxation times. The distribution in the relaxation times may be attributed to existence of electrically heterogeneous grains, insulating grain boundary, and electrode contact regions. Doping, thus, results in substantial modifications in the dielectric and electrical properties of the nano-ceramic CaSiO3. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：197 / 202

页数：6

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