Microwave-induced combustion synthesis of Li0.5Fe2.5-xMxO4 (M = Al, Cr, Mn) powder and their characterization

• Published in: Journal of alloys and compounds Vol. 395; no. 1-2; pp. 272 - 276
• Main Authors: FU, Yen-Pei, SHEN TSAO, HU, Chen-Ti, YAO, Yeong-Der
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier 31.05.2005
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Magnetic properties and materials; Materials science; Materials synthesis; materials processing; Physics; Combustion synthesis; Powders; Annealing; Curie point; Thermomagnetic effects; Microwave radiation; 75.50.Tt; 75.60.Ej Lithium ferrite; Lithium; Aluminium; Differential thermal analysis; XRD; Microwave-induced combustion synthesis; Ferrites; Transmission electron microscopy; Ion substitution; Chromium; Saturation magnetization; Manganese
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2004.11.048

Li0.5Fe2.5-xMxO4 (M = Al, Cr, Mn) powders with small and uniformly sized particles were successfully synthesized by microwave-induced combustion, using lithium nitrate, ferric nitrate, aluminum nitrate, chromium nitrate, manganese nitrate, and carbohydrazide as the starting materials. The process takes only a few minutes to obtain as-received Al, Cr, and Mn-substituted lithium ferrite powders. The resultant powders annealed at 650 DGC 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 saturation magnetization and Curie temperature of Li0.5Fe2.5-xMxO4 were strongly affected by different metal ions substitution.