Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 16, Pages 2433-2437Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2009.02.138
Keywords
Nanocrystalline ferrite; Microwave Hydrothermal method; Microwave annealing; Dielectric property; Transformer application
Funding
- DST, UGC, New Delhi
- BRNS, Mumbai, India
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Microwave-Hydrothermal (M-H) method has been successfully used for the synthesis of nanocrystalline Mn-Zn ferrites which are used for high-frequency applications. As synthesized powders were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The nanopowders were annealed at 600 degrees C/20 min using the microwave sintering method. The frequency dependence of dielectric constant (epsilon') was measured in the range of 10 Hz-1.3 GHz and initial permeability (mu(i)) was measured in the range of 10 Hz-1 MHz. The total power loss (P-t) was measured on the annealed samples at 100 kHz and 200 mT condition. Conductor-embedded-ferrite transformers were fabricated and output power (P-o), efficiency (eta) and temperature rise (Delta T) were measured at sinusoidal voltage of 25 V at 1 MHz. The transformer efficiency (Z) was found to be high and surface rise of temperature (Delta T) is very low. (C) 2009 Elsevier B.V. All rights reserved.
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