Schottky-type grain boundaries in CCTO ceramics

被引：90

作者：

Felix, A. A. ^{[1
]}

Orlandi, M. O. ^{[1
]}

Varela, J. A. ^{[1
]}

机构：

[1] Univ Estadual Paulista, Sao Paulo State Univ, Dept Phys Chem, BR-14800900 Sao Paulo, Brazil

来源：

SOLID STATE COMMUNICATIONS | 2011年 / 151卷 / 19期

基金：

巴西圣保罗研究基金会;

关键词：

CCTO; Grain boundary; Potential barrier; Schottky model; GIANT DIELECTRIC-CONSTANT; CACU3TI4O12; CERAMICS; COPPER-TITANATE; PEROVSKITE; BARRIER; ORIGIN; OXIDE;

D O I：

10.1016/j.ssc.2011.06.012

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this work we studied electrical barriers existing at CaCu(3)Ti(4)O(12) (CCTO) ceramics using dc electrical measurements. CCTO pellets were produced by solid state reaction method and X-ray diffractograms showed which single phase polycrystalline samples were obtained. The samples were electrically characterized by dc and ac measurements as a function of temperature, and semiconductor theory was applied to analyze the barrier at grain boundaries. The ac results showed the sample's permittivity is almost constant (10(4)) as function of temperature at low frequencies and it changes from 100 to 10(4) as the temperature increases at high frequencies. Using dc measurements as a function of temperature, the behavior of barriers was studied in detail. Comparison between Schottky and Poole-Frenkel models was performed, and results prove that CCTO barriers are more influenced by temperature than by electric field (Schottky barriers). Besides, the behavior of barrier width as function of temperature was also studied and experimental results confirm the theoretical assumptions. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1377 / 1381

页数：5

共 21 条

[1] Characterization of grain boundary impedances in fine- and coarse-grained CaCu3Ti4O12 ceramics -: art. no. 094124 [J].

Adams, TB ;

Sinclair, DC ;

West, AR .

PHYSICAL REVIEW B, 2006, 73 (09)

[2]

Adams TB, 2002, ADV MATER, V14, P1321, DOI 10.1002/1521-4095(20020916)14:18<1321::AID-ADMA1321>3.0.CO

[3]

2-P

[4] The effect of processing on the giant dielectric properties of CaCu3Ti4O12 [J].

Bender, BA ;

Pan, MJ .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2005, 117 (03) :339-347

[5] Strong nonlinear current-voltage behaviour in perovskite-derivative calcium copper titanate [J].

Chung, SY ;

Kim, ID ;

Kang, SJL .

NATURE MATERIALS, 2004, 3 (11) :774-778

[6] Physical aspects of colossal dielectric constant material CaCu3Ti4O12 thin films [J].

Deng, Guochu ;

He, Zhangbin ;

Muralt, Paul .

JOURNAL OF APPLIED PHYSICS, 2009, 105 (08)

[7] DEGRADATION MECHANISM OF NON-OHMIC ZINC-OXIDE CERAMICS [J].

EDA, K ;

IGA, A ;

MATSUOKA, M .

JOURNAL OF APPLIED PHYSICS, 1980, 51 (05) :2678-2684

[8] Optical response of high-dielectric-constant perovskite-related oxide [J].

Homes, CC ;

Vogt, T ;

Shapiro, SM ;

Wakimoto, S ;

Ramirez, AP .

SCIENCE, 2001, 293 (5530) :673-676

[9]

Kingery B.U., 1976, INTRO CERAMICS

[10] Evidence for internal resistive barriers in a crystal of the giant dielectric constant material:: CaCu3Ti4O12 [J].

Li, J ;

Sleight, AW ;

Subramanian, MA .

SOLID STATE COMMUNICATIONS, 2005, 135 (04) :260-262

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