Effect of small amount of cobalt substitution on structure and microwave dielectric properties of barium magnesium niobate ceramics |
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| Authors: | Ching-Tien Chen Chi-Yuen Huang Hong-Jin Lin Chun-Te Lee |
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| Affiliation: | 1. Department of Resources Engineering, National Cheng Kung University, Tainan, Taiwan;2. R&D Technology Center, Yageo Corporation, Kaohsiung 811, Taiwan;1. Materials Science Department at Carlos III University of Madrid, Avd. Universidad 30, 28911 Leganés, Spain;2. IMDEA Materials Institute, Eric Kandel 2, 28906 Getafe, Spain;1. Nigde University, Mechanical Engineering Department, 51245, Nigde, Turkey;2. Nigde University Prof. Dr. T. Nejat Veziroglu Clean Energy Research Center, 51245, Nigde, Turkey;3. Vestel Defense Industry, Universiteler Mah, Ihsan Dogramaci Bul, Titanyum Blok, 17/B Teknokent ODTU, 06800, Ankara, Turkey;1. Institute of Structural Macrokinetics and Materials Sciences, Russian Academy of Sciences, ul. Akademika Osipyana 8, Chernogolovka, Moscow region 142432, Russia;2. National University of Science and Technology MISiS, Leninskii pr. 4, Moscow 119049, Russia;1. Graduate School of Environmental and Life Science, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama, 700-8530, Japan;2. Graduate School of Natural Sciences and Technology, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama, 700-8530, Japan;3. Research Core for Interdisciplinary Sciences, Okayama University, 3-1-1, Tsushimanaka, Kita-ku, Okayama 700-8530, Japan;4. Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan;5. Graduate School of Science and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan;1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156–83111, Iran;2. Young Researchers and Elite Club, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran |
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| Abstract: | We investigated effects of substituting cobalt for magnesium on microstructures and microwave dielectric properties of BaMg1/3Nb2/3O3 ceramics. Nucleation and growth of 1:2 ordered domains dominate microstructural variations for Ba(Mg1?xCox)1/3Nb2/3O3 ceramics. Microstructures such as grains sizes and domain sizes significantly dominate variations of Q × f value. Less ordered domains are nucleated when substituting small amount of cobalt (x < 0.1). Accordingly, domains and grains significantly grow with increased cobalt substitution. The 1:2 ordering degree is subsequently increased, and Q × f achieves a maximum value at x = 0.05. Nevertheless, while cobalt substitution exceeds x = 0.1, more ordered nuclei occur and consequently affect the domain growth and the grain growth. The Q × f value remarkably decreases at x = 0.1, and varies due to different ordering degrees and compositions. The Q × f value of specimens at x = 0.05 becomes as high as 43,000, and is similar to that of specimens at x = 0.5. |
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