Effect on the grain size of single-mode microwave sintered NiCuZn ferrite and zinc titanate dielectric resonator ceramics
| Autor: | Sirugudu, R.K., Vemuri, R.K.M., Venkatachalam, S., Gopalakrishnan, A., Budaraju, S.M. |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Ball-milled
Copper content Dielectric characteristics Dielectric resonator ceramics Grain size Grain size variation High energy Low density Low dielectric constants Low dielectric loss Low qualities Magnetic characteristic Microwave interactions Microwave methods Microwave sintering NiCuZn ferrites Paraelectrics Single-mode microwaves Sintered Ni Sintered samples Temperature stable TiO Zinc titanate Dielectric losses Dielectric materials Dielectric properties Dielectric resonators Ferrite Ferrites Grain size and shape Gyrators Magnetic properties Microwave heating Microwaves Natural frequencies Superlattices Titanium dioxide Zinc Sintering copper copper nickel alloy nickel ceramics chemistry heating impedance materials testing methodology microwave radiation particle size radiation dose radiation exposure Ceramics Copper Electric Impedance Heating Materials Testing Nickel Particle Size Radiation Dosage |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| Popis: | 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 Ni 0.6Cu 0.2Zn 0.2Fe 1.98O 4-?and ZnTiO 3are 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 Ni 0.6Cu 0.2Zn 0.2Fe 1.98O 4-?is 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 0.3Cu 0.5Zn 0.2Fe 1.98O 4.?. 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 TiO 2is observed to achieve the temperature stable resonant frequency. |
| Databáze: | OpenAIRE |
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