Metal-ceramic interfaces in internally reduced (Mg,Cu)O |
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| Affiliation: | 1. CNRS-LPM, 1 place A. Briand, 92195 Meudon-Bellevue, France;2. CNRS-CECM, 15 rue G. Urbain, 94407 Vitry-sur-Seine, France;1. Department of Agricultural and Food Engineering, Indian Institute of Technology Kharagpur, 721302, India;2. Department of Civil Engineering, Indian Institute of Technology Kharagpur, 721302, India;1. Key Laboratory of Flexible Electronics & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, 5 XinMofan Road, Nanjing 210009, China;2. School of Physics and Electronics, Hunan University, ChangSha 410082, China;3. School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore;4. Shanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi’an 710072, Shanxi, China;1. State Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China;2. State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring, China National Environmental Monitoring Centre, Beijing 100012, China;1. Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, Coyoacán, 04510, México D. F., Mexico;2. Instituto Politécnico Nacional, Escuela Superior de Ingeniería Química e Industrias Extractivas, Madero, C.P. 07730, México, D.F, Mexico;3. Catedrático CONACYT-Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, C.P. 78210, San Luis Potosí, S.L.P., Mexico;1. Department of Urology, Shengjing Hospital of China Medical University, Shenyang, China;2. Department of Radiology, Shengjing Hospital of China Medical University, Shenyang, China;3. Department of Urology, The First Affiliated Hospital of China Medical University, Shenyang, China |
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| Abstract: | Conventional and high resolution TEM observations of the precipitation scale obtained after internal reduction of (Mg,Cu)O single crystals have revealed special orientation relationships between the metal copper and the ceramic matrix MgO. The intermediate valence state of copper induces a mechanism in two steps for this internal reduction. In the first one, cuprite Cu2O forms in one of the four orientations (T, TA, D, DA); in the second step, while the reaction front penetrates further into the matrix, cuprite particles are reduced to metallic copper. The orientation of the particles within the matrix can either be maintained or evolved into a twinned orientation. |
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