Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7919993 | Journal of Physics and Chemistry of Solids | 2018 | 8 Pages |
Abstract
Calcium stannate (Ca2SnO4) is a common dielectric ceramic that is generally prepared by a high-temperature solid-state method in an air atmosphere with a roasting temperature of more than 1300â¯Â°C. In this study, Ca2SnO4 was much more easily synthesized in a CO-CO2 atmosphere at a relatively low temperature of less than 1000â¯Â°C for 30â¯min. We comparatively investigated the formation behavior and microwave dielectric properties of Ca2SnO4 synthesized from tin dioxide (SnO2) and calcium carbonate (CaCO3) by a solid-state method in air and CO-CO2 atmospheres using X-ray diffraction, scanning electron microscopy, inductively coupled plasma atomic emission spectroscopy, and vector network analysis. The formation behavior of calcium stannate indicated that the reactions between SnO2 and CaCO3 in CO-CO2 and air atmospheres were both controlled by three-dimensional diffusion. In a CO-CO2 atmosphere, the reaction had a higher reaction rate constant (k) and lower apparent activation energy (E). In addition, Ca2SnO4 was synthesized by a low-temperature solid-state method in a CO-CO2 atmosphere. The results indicated that Ca2SnO4 ceramics had a higher dielectric constant and lower dielectric tangent loss than those synthesized by the high-temperature solid-state method in air. However, the synthesis temperature and time were reduced by more than 300â¯Â°C and 8â¯h, respectively.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Yuanbo Zhang, Benlai Han, Zijian Su, Bingbing Liu, Tao Jiang,