Surface and bulk order-disorder transitions |
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| Affiliation: | 1. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, United States;2. Fuel Modeling and Simulation Department, Idaho National Laboratory, Idaho Falls, ID, 83415, United States;1. CAS Key Laboratory of Magnetic Materials and Devices, Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Center for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, College of Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China;4. Ningbo Zhongke B Plus New Materials Technology Co., Ltd, Ningbo, Zhejiang, 315201, China;5. School of Material Chemistry, Ningbo University, Ningbo, Zhejiang, 315201, China;1. National Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, CO 80401, USA;2. Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA;3. Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 70101, Taiwan;1. National Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, CO 80401, USA;2. Department of Chemical Engineering, University of Florida, 1030 Center Dr, Gainesville, FL 32611, USA |
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| Abstract: | Interrelation of surface an bulk order-disorder transitions in binary alloys AxB1−x is discussed within the framework of the Bragg-Williams approximation, using the fcc (100) and bcc (110) surfaces as an example. In an fcc alloy with a (100) surface, layers parallel to the surface undergo alternately second-order transitions. On the other hand, the bulk fee alloy reveals a first-order transition from the disordered phase to a mixture of the disordered and the AB3- (or A3B-) type ordered phases except for X = 0.5. The origin of the bulk first-order transition is discussed by taking into account order-disorder transitions in the surface region. For comparison, the bulk second-order transition in a bcc alloy is also discussed. |
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