Magnetic and magnetotransport properties of La2/3Ca1/3MnO3/Se2FeMoO6 nano-crystalline composites synthesized under high pressure
✍ Scribed by L.D. Yao; P. E; J.S. Zhang; W. Zhang; F.Y. Li; C.Q. Jin; R.C. Yu
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 403 KB
- Volume
- 403
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
La 2/3 Ca 1/3 MnO 3 and Se 2 FeMoO 6 nano-crystalline powders were pre-prepared using the polymer-network gel method, and the average grain sizes of La 2/3 Ca 1/3 MnO 3 and Se 2 FeMoO 6 were about 40 and 50 nm, respectively. A series of La 2/3 Ca 1/3 MnO 3 /Se 2 FeMoO 6 nanocrystalline composites (molar ratio 1:1) were successfully synthesized under high pressure (4 GPa) and different treating temperatures. Due to the compositive influence of the smaller grain sizes, the Curie transition temperatures T C ($225 K) for all composites are lower than that of the pure phase La 2/3 Ca 1/3 MnO 3 . For the sample synthesized at the optimum conditions, the magnetoresistance value is close to 32% at 3 T and 5 K.