Dielectric loss in porous TiO2 |
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| Affiliation: | 1. Terminal Ballistics Research Laboratory, Ministry of Defence, Sector 30, Chandigarh 160030 India;2. Centre of Excellence in Nanotechnology and Materials Science, Shoolini University, Solan, HP 173212, India;3. Nanotechnology Wing, Innovative Science Research Society, Shimla 171001, India;4. Laboratoire des Sciences et Techniques, de l’Information, de la Communication et de la Connaissance,UMR CNRS 6285, 6 av. Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France;1. Research Center, Wellmer Co., Ltd., 7-8 Dontan-myeon, Dongtansandan 2-gil, Hwaseong-si, Gyeonggi-do 18487, Republic of Korea;2. Advanced Materials Convergence Division, Korea Institute of Ceramic Engineering & Technology, 101 Soho-ro, Jinju-si, Gyeongsangnam-do 52851, Republic of Korea;3. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea;4. Functional Ceramics Group, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Seongsan-gu, Changwon, Gyeongsangnam-do 51508, Republic of Korea;5. School of Advanced Materials Science & Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Republic of Korea;6. Department of Energy Engineering, Gyeongnam National University of Science and Technology (GNTECH), 33 Dongjin-ro, Jinju-si, Gyeongsangnam-do 52725, Republic of Korea;1. School of Earth Sciences and Engineering, Xi''an Shiyou University, Xi''an 710065, China;2. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao 266590, China;3. Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan 430074, China;4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;5. Exploration and Development Department, Zhejiang Oilfield Company, CNPC, Hangzhou 310023, China;6. Shanxi Yanchang Petroleum Group Exploration Company, Yanan 716000, China;7. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China |
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| Abstract: | The dielectric loss behavior of TiO2 was characterized on samples of variable porosity and variable pore size. Pores were formed by two methods: varying the sintering temperature and by the addition of a spherical carbon porogen. Porosities varied from 5.9% to 59.3%. Dielectric loss increased with increasing pore volume in each case. However, dielectric loss increased at a slower rate for porogen induced pores. At equivalent pore volumes, pore surface area volumes were higher than those induced using the porogen. Dielectric loss behavior was shown to vary linearly with pore surface area. Our work demonstrates that large pores reduce free surface area and decrease dielectric loss when compared to similar samples with smaller pores. A new model of porous dielectric loss is proposed that characterizes materials based on generalized free surface area instead of porosity alone. Based on this model, we show that the relative loss of porous dielectrics depends critically on the pore surface area and the loss tangent of the parent dielectric. |
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| Keywords: | Dielectric properties Porosity |
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