Microwave sintering of Ni-Zn ferrites: Comparison with conventional sintering

Purushotham Yadoji; Ramesh Peelamedu; Dinesh Agrawal; Rustum Roy

doi:10.1016/S0921-5107(03)00063-1

Microwave sintering of Ni-Zn ferrites: Comparison with conventional sintering

Purushotham Yadoji
, Ramesh Peelamedu
, Dinesh Agrawal
, Rustum Roy

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

312 Scopus citations

Abstract

Ni_1-xZn_xFe₂O₄ 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.

Original language	English (US)
Pages (from-to)	269-278
Number of pages	10
Journal	Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume	98
Issue number	3
DOIs	https://doi.org/10.1016/S0921-5107(03)00063-1
State	Published - Apr 15 2003

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/S0921-5107(03)00063-1

Cite this

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title = "Microwave sintering of Ni-Zn ferrites: Comparison with conventional sintering",

abstract = "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.",

author = "Purushotham Yadoji and Ramesh Peelamedu and Dinesh Agrawal and Rustum Roy",

note = "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. ",

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doi = "10.1016/S0921-5107(03)00063-1",

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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.

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M3 - Article

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JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology

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Microwave sintering of Ni-Zn ferrites: Comparison with conventional sintering

Abstract

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