Nanoscaled surface structures of ionic crystals by spinodal decomposition |
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| Institution: | 1. Department of Chemistry, Moscow State University, Leninskie Gory, House 1, Building 3, GSP-2, Moscow 119992, Russia;2. Indian Institute of Technology Madras, Chennai 600036, India;3. Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, Natal 59082-970, Brazil;2. Departamento de Electricidad y Electrónica, Universidad del País Vasco (UPV/EHU), 48940 Leioa, Spain;3. Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, AP 14, Ensenada 22860, Baja California, Mexico;4. Departamento de Física, Universidad de Oviedo, 33007 Oviedo, Spain;5. Departamento de Física, EPI, Universidad de Oviedo, 33203 Gijón, Spain;1. Departamento de Física, Universidad de Oviedo, Avenida Calvo Sotelo s/n, 33007 Oviedo, Spain;2. Centro de Investigación en Nanomateriales y Nanotecnología CINN (CSIC, Universidad de Oviedo), Avenida de la Vega 4-6, 33940 El Entrego, Spain;1. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;2. Department of Physics, Capital Normal University, Beijing 100048, China |
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| Abstract: | Self-organised periodic surface structures are prepared by spinodal decomposition of AgCl–NaCl single crystals and subsequent ex-solution of the alkali-rich component. While the kinetics of decomposition was studied previously by time-resolved neutron scattering, in the present paper, the etching process is studied in some detail and the surface structures are characterised by atomic force microscopy. It is shown that the duration of both, the demixing process as well as the etching process, determines the characteristic length scale of the periodic pattern. Under well controlled conditions, relief structures with wavelengths of some 100 nm are obtained that are uniform over areas of some mm2. These patterns can possibly be used as templates for the decoration with metals, macromolecules, etc. |
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