Field-assisted sintering and phase transition of ZnS-CaLa2S4 composite ceramics |
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| Affiliation: | 1. Kazuo Inamori School of Engineering, New York State College of Ceramics, Alfred University, Alfred, New York, 14802, United States;2. Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York, 11973-5000, United States;1. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai 201800, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Shanghai Institute of Ceramics, CAS, Shanghai 200050, China;4. IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China;1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Sialon Group, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan;3. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;1. Key Laboratory of Transparent and Opto-functional Advanced Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Department of Physics, Shanghai Normal University, Shanghai, 200234, China |
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| Abstract: | In the present study, zinc sulfide (ZnS) and calcium lanthanum sulfide (CaLa2S4, CLS) composite ceramics were consolidated via field-assisted sintering of 0.5ZnS-0.5CLS (volume ratio) composite powders at 800–1050 °C. Through sintering curve analyses and microstructural observations, it was determined that between 800 and 1000 °C, grain boundary diffusion was the main mechanism controlling grain growth for both the ZnS and CLS phases within the composite ceramics. The consolidated composite ceramics were determined to be composed of sphalerite ZnS, wurtzite ZnS and thorium phosphate CLS. The sphalerite-wurtzite phase transition of ZnS was further demonstrated to be accompanied by the formation of stacking faults and twins in the ceramics. It was also found that the addition of the CLS phase improved the indentation hardness of the ceramics relative to pure ZnS by homogeneous dispersion of ZnS and CLS small grains. |
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| Keywords: | Sintering behavior Phase transition Field-assisted sintering Hardness |
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