TY - JOUR
T1 - Microwave sintering of Ni-Zn ferrites
T2 - Comparison with conventional sintering
AU - Yadoji, Purushotham
AU - Peelamedu, Ramesh
AU - Agrawal, Dinesh
AU - Roy, Rustum
N1 - Funding Information:
Purushotham Yadoji wishes to thank Department of Science and Technology (Government of India) for awarding BOYSCAST fellowship and having allowed him to work at the Microwave processing and Engineering Center, The Pennsylvania State University, USA. Authors would like to thank Professor Craig Grimes for magnetic measurements.
PY - 2003/4/15
Y1 - 2003/4/15
N2 - Ni1-xZnxFe2O4 with x = 0.0-1.0 in steps of 0.2 have been densified to >95% of theoretical both by conventional and microwave sintering procedures. Comparison studies were performed on these samples sintered at 1275°C for 30 min. Microstructural study revealed large, but fewer pores in the microwave sintered specimens and small, but substantially more pores in the case of conventionally sintered specimens. Magnetic properties measurements showed lower coercivity and higher magnetization values for microwave sintered specimens. Lower coercivity values observed in microwave sintered specimens are attributed to larger grain size and higher magnetization values may be explained by the contribution of the 'microwave field' to the 'uncoupling spin effect'. Most significantly samples sintered in a microwave field, generally, showed lower dielectric constant values compared with the samples sintered conventionally, making microwave sintering particularly suitable for high frequency applications.
AB - Ni1-xZnxFe2O4 with x = 0.0-1.0 in steps of 0.2 have been densified to >95% of theoretical both by conventional and microwave sintering procedures. Comparison studies were performed on these samples sintered at 1275°C for 30 min. Microstructural study revealed large, but fewer pores in the microwave sintered specimens and small, but substantially more pores in the case of conventionally sintered specimens. Magnetic properties measurements showed lower coercivity and higher magnetization values for microwave sintered specimens. Lower coercivity values observed in microwave sintered specimens are attributed to larger grain size and higher magnetization values may be explained by the contribution of the 'microwave field' to the 'uncoupling spin effect'. Most significantly samples sintered in a microwave field, generally, showed lower dielectric constant values compared with the samples sintered conventionally, making microwave sintering particularly suitable for high frequency applications.
UR - http://www.scopus.com/inward/record.url?scp=0038476168&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0038476168&partnerID=8YFLogxK
U2 - 10.1016/S0921-5107(03)00063-1
DO - 10.1016/S0921-5107(03)00063-1
M3 - Article
AN - SCOPUS:0038476168
SN - 0921-5107
VL - 98
SP - 269
EP - 278
JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
IS - 3
ER -