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Effect on the grain size of single-mode microwave sintered NiCuZn ferrite and zinc titanate dielectric resonator ceramics
Subramanian Venkatachalam, Srinivas Murty Budaraju
Published in International Microwave Power Institute
2011
PMID: 24427876
Volume: 45
   
Issue: 3
Pages: 128 - 136
Abstract
Microwave sintering of materials significantly depends on dielectric, magnetic and conductive losses. Samples with high dielectric and magnetic loss such as ferrites could be sintered easily. But low dielectric loss material such as dielectric resonators (paraelectrics) finds difficulty in generation of heat during microwave interaction. Microwave sintering of materials of these two classes helps in understanding the variation in dielectric and magnetic characteristics with respect to the change in grain size. High-energy ball milled Ni0.6Cu0.2Zn0.2Fe1.98O 4-δand ZnTiO3are sintered in conventional and microwave methods and characterized for respective dielectric and magnetic characteristics. The grain size variation with higher copper content is also observed with conventional and microwave sintering. The grain size in microwave sintered Ni0.6Cu0.2Zn0.2Fe1.98O 4-δis found to be much small and uniform in comparison with conventional sintered sample. However, the grain size of microwave sintered sample is almost equal to that of conventional sintered sample of Ni 0.3Cu0.5Zn0.2Fe1.98O 4.δ. In contrast to these high dielectric and magnetic loss ferrites, the paraelectric materials are observed to sinter in presence of microwaves. Although microwave sintered zinc titanate sample showed finer and uniform grains with respect to conventional samples, the dielectric characteristics of microwave sintered sample are found to be less than that of conventional sample. Low dielectric constant is attributed to the low density. Smaller grain size is found to be responsible for low quality factor and the presence of small percentage of TiO2is observed to achieve the temperature stable resonant frequency.
About the journal
JournalJournal of Microwave Power and Electromagnetic Energy
PublisherInternational Microwave Power Institute
ISSN08327823
Open AccessNo
Concepts (44)
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    Conductive materials
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    Dielectric devices
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    Dielectric losses
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    Dielectric properties
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    Dielectric resonators
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    Ferrite
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    FERRITES
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    Grain size and shape
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    Magnetic properties
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    Magnetism
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    Microwave filters
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    Microwave heating
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    Microwave resonators
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    MICROWAVES
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    Natural frequencies
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    Nickel
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    Resonators
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    Sintering
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    TITANIUM COMPOUNDS
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    Zinc
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    DIELECTRIC CHARACTERISTICS
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    DIELECTRIC RESONATOR CERAMICS
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    Grain size
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    LOW DIELECTRIC CONSTANTS
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    Magnetic characteristic
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    Microwave interactions
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    Microwave sintering
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    SINGLE-MODE MICROWAVES
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    Dielectric materials
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    Copper
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    COPPER NICKEL ALLOY
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    Article
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    Ceramics
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    Chemistry
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    Heating
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    Impedance
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    Materials testing
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    Methodology
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    Microwave radiation
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    Particle size
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    Radiation dose
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    Radiation exposure
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    Electric impedance
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    Radiation dosage