Role of particle size on the magnetoresistance of nano-crystalline graphite

被引：3
|
作者：
Mandal, Guruprasad [1 ]
Srinivas, V. [2 ]
Rao, V. V. [1 ]
机构：
[1] Indian Inst Technol, Cryogen Engn Ctr, Kharagpur 721302, W Bengal, India
[2] Indian Inst Technol, Dept Phys, Madras 600036, Tamil Nadu, India
来源：
CARBON | 2013年 / 57卷
关键词：
GIANT POSITIVE MAGNETORESISTANCE; TRANSVERSE MAGNETORESISTANCE; LINEAR MAGNETORESISTANCE; KISH GRAPHITE; ELECTRICAL-PROPERTIES; GRANULAR COMPOSITES; BISMUTH NANOWIRES; MAGNETIC-FIELD; DEPENDENCE; SEMICONDUCTORS;
D O I：
10.1016/j.carbon.2013.01.057
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report on microstructure and magnetotransport behavior of ball milled graphite to investigate the effect of particle size on magnetoresistance (MR) in graphite. The observed results show, large values of resistivity and a negative temperature coefficient of resistivity indicating non-metallic, semiconductor nature of the compacts. As the milling time increases, the resistivity value increase which is attributed to the particle size differences of the samples. Graphite exhibits the positive MR at room temperature as well as at low temperatures (4K). 600 degrees C annealed samples exhibit less resistivity compared to as-milled samples due to the grain growth during annealing but show large MR values compared to as-milled sample. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：139 / 145
页数：7
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