Grain size effect on microwave dielectric properties of Na2WO4 ceramics prepared by cold sintering process |
| |
| Affiliation: | 1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150080, PR China;2. Department of Ceramics in Petrochemical Engineering & Environmental Protection, Shandong Guiyuan Advanced Ceramic Co., Ltd (Sicer), Zibo, 255035, PR China;1. Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, United States;2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, United States;3. TAIYO YUDEN CO., LTD., Kyobashi, Chuo-ku, Tokyo 104-0031, Japan;4. CIRIMAT, Université de Toulouse, CNRS, Université de Toulouse 3 – Paul Sabatier, 118 Route de Narbonne 31062, Toulouse, Cedex 9, France;5. CNRS, Université de Bordeaux, ICMCB, UMR 5026, 87 Avenue du Dr A. Schweitzer, 33608, Pessac, France;6. Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802, United States |
| |
| Abstract: | In this work, cold sintering was adopted to prepare Na2WO4 ceramics with different grain sizes ranging from 0.632 μm to 17.825 μm. Their microstructures, complex impedance, and microwave dielectric properties were studied in-depth. It was found that samples with relative densities higher than 92% can be successfully synthesized by cold sintering process at a low temperature of 240 °C. However, their electrical properties have strong dependence on the grain size. Specifically, the resistance of grain boundaries decreases dramatically with the increase of grain sizes, while the quality factor has a positive correlation with the grain sizes of Na2WO4 ceramics. Excellent microwave dielectric properties, including permittivity = 5.80, Q × f = 22,000 GHz, and TCF = ?70 ppm/°C, are obtained for Na2WO4 ceramics with a grain size of 4.477 μm prepared by cold sintering process. |
| |
| Keywords: | Grain size Microwave dielectric material Cold sintering process |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
