The relationship between microstructure and quality factor for (Al,Mg,Ta)O2 microwave dielectrics |
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| Affiliation: | 1. Harvard School of Public Health, Boston, United States;2. Simon Fraser University, Faculty of Health Sciences, Burnaby, Canada;3. Mbarara University of Science and Technology (MUST), Mbarara, Uganda;4. Epicentre Mbarara, Mbarara, Uganda;5. University of California at San Francisco, San Francisco, United States;6. Massachusetts General Hospital, Center for Global Health & Department of Medicine, Boston, United States;7. Massachusetts General Hospital, Center for Global Health & Division of Infectious Disease, Boston, United States;1. Materials & Structural Engineering Department, Nanjing Hydraulic Research Institute, 34 Hujuguan, Nanjing 210024, China;2. College of Mechanics and Materials, Hohai University, 1 Xikang Road, Nanjing 210098, China |
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| Abstract: | The relationship between microstructures and quality factor (Q) of (1−x)(Al1/2Ta1/2)O2–x(Mg1/3Ta2/3)O2 ceramics was investigated. The extrinsic loss of microwave dielectrics depended on cations ordering, grain size, and porosity. (Al1/2Ta1/2)O2 has a disordered structure and (Mg1/3Ta2/3)O2 has an ordered trirutile structure. As (Mg1/3Ta2/3)O2 content increased, (1−x)(Al1/2Ta1/2)O2–x(Mg1/3Ta2/3)O2 ceramics revealed an ordered phase and were of single phase for x>0.6. The increase of the ordered phase and grain size enhanced the Q. When ordering was completed at (Mg1/3Ta2/3)O2 concentration over 60 mol%, the grain size was a major factor in the increase the Q value. In contrast the porosity degraded the Q value. Therefore, the Q value depended on order/disorder, the porosity, and the grain size in that order. |
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