Characteristics of La0.7Ca0.3MnO3 Powders Prepared by the Solution Combustion and Solid State Reaction Methods for Colossal Magnetoresistance Applications

Journal of Materials Synthesis and Processing - Tập 10 - Trang 47-52 - 2002
K. R. Lee1, J. Y. Chong1, J. H. Lee2, J. S. Song3, S. Park1
1Department of Inorganic Materials Engineering, Myongji University, Yongin, Kyunggi-do, Republic of Korea
2Department of Electronic Materials Engineering, Sunmoon University, Asan, Choongnam, Republic of Korea
3New Materials Application Research Group, Strategic Electrotechnology Research Center, Changwon, Kyongnam, Republic of Korea

Tóm tắt

La0.7Ca0.3MnO3 powders were prepared by both the solution combustion method and the solid state reaction method and were calcinated at various calcination temperatures and time intervals in air atmosphere. In the solid state reaction method, single-phase La0.7Ca0.3MnO3 was obtained after heat treatment of the powder at 1000°C for 24 hr. In the solution combustion method, however, single-phase La0.7Ca0.3MnO3 powder could be obtained easily when the powder was heat-treated at 650°C for only 30 min. Polycrystalline La0.7Ca0.3MnO3 powder, using the solution combustion method, showed good powder characteristics, such as an average grain size of 50 nm and a specific surface area of 92 m2/g. The resistance as a function of temperature and the magnetoresistance ratio in La0.7Ca0.3MnO3 thin films were attempted to examine the colossal magnetoresistance characteristics. These thin films also showed excellent colossal magnetoresistance properties in that 96% of the maximum magnetoresistance ratio was obtained at 97K.

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Thông tin
Thông tin xuất bản

Journal of Materials Synthesis and Processing

Tập 10

47-52

Thông tin tác giả