Microwave-induced combustion synthesis of Li{sub 0.5}Fe{sub 2.5-x}Cr {sub x}O{sub 4} powder and their characterization
Journal Article
·
· Materials Research Bulletin
- Department of Materials Science and Engineering, National Dong-Hwa University, Shou-Feng, Hualien, 974 Taiwan (China)
Li{sub 0.5}Fe{sub 2.5-x}Cr {sub x}O{sub 4} (0 {<=} x {<=} 1.0) powders with small and uniformly sized particles were successfully synthesized by microwave-induced combustion, using lithium nitrate, iron nitrate, chromium nitrate, and carbohydrazide as the starting materials. The process takes only a few minutes to obtain as-received Cr-substituted lithium ferrite powders. The resultant powders annealed at 650 deg. C for 2 h and were investigated by thermogravimeter/differential thermal analyzer (TG/DTA), X-ray diffractometer (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and thermomagnetic analysis (TMA). The results revealed that the lattice constant decreases linearly with increasing of Cr content in Li{sub 0.5}Fe{sub 2.5-x}Cr {sub x}O{sub 4} specimens. Moreover, the magnetic properties of Cr-substituted lithium ferrite were also strongly affected by Cr content. The saturation magnetization, remanent magnetization, and coercive force decrease monotonously with increasing of Cr content.
- OSTI ID:
- 20891664
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 41; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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