Paper Title:
Grain-Size Effects and the Physical Properties of La0.7Ca0.3MnO3-δ
  Abstract

The effects of grain-size in La0.7Ca0.3MnO3-δ (LCMO) system have been studied in connection with the magnetic and electronic properties. LCMO system prepared by the solid-state reaction was annealed in air at 1200, 1300 and 1400°C. The grain sizes of LCMO samples become larger with increasing of annealing temperature (TA ). The magnetization in LCMO samples increased while the coercive field decreased with increasing TA. The conductivity increased and the metal-insulator transition temperature TM-I decreased with increasing of TA. These physical properties are due to the oxygen deficiency caused by the increase of grain size. Finally, it was found that the grain size and the mechanical connection between grains play an important role in determining the electronic and magnetic properties.

  Info
Periodical
Key Engineering Materials (Volumes 277-279)
Edited by
Kwang Hwa Chung, Yong Hyeon Shin, Sue-Nie Park, Hyun Sook Cho, Soon-Ae Yoo, Byung Joo Min, Hyo-Suk Lim and Kyung Hwa Yoo
Pages
929-934
DOI
10.4028/www.scientific.net/KEM.277-279.929
Citation
H.K. Lee, H. Baier, J.S. Park, Y.P. Lee, Y. S. Lee, "Grain-Size Effects and the Physical Properties of La0.7Ca0.3MnO3-δ", Key Engineering Materials, Vols. 277-279, pp. 929-934, 2005
Online since
January 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Cheng Ju Zhang, Jin Feng Wang, Wen Bin Su, Guo Zhong Zang, Hong Cun Chen
Abstract:The effects of Pr on the microstructure and nonlinear electrical properties of the (Co,Ta)-doped SnO2 varistors were investigated. It was...
275
Authors: Vladimir V. Popov
Abstract:Possibilities of grain-boundary diffusion and segregation studies using nuclear gammaresonance spectroscopy (NGR) are considered. It is...
497
Authors: Yoshiaki Kinemuchi, Hisashi Kaga, Satoshi Tanaka, Keizo Uematsu, Hiromi Nakano, Koji Watari
Abstract:Thermoelectric properties of zinc oxide ceramics are largely influenced by the mobility variation because of the formation of double...
581
Authors: W. Mao, Y. Li, W. Guo, Z. An
Abstract:The precipitation behaviors of fine MnS and other second phase particles in hot band, decarburized sheet and 875 oC annealed sheet before...
247
Authors: Hong Guo, Zhi Wei Chen, Ying Jiang, Zheng Xu Cai
Abstract:The grain boundary character distribution (GBCD) and its effect on the corrosion resistance of copper and brass (H65, H80) after solid...
907