79723 20200117221630.0 doi 10.1016/j.jallcom.2018.07.120 sideral 107321 ART-2018-107321 eng (orcid)0000-0003-1930-1455 Ciria, Miguel Universidad de Zaragoza Crystal structure and local ordering in epitaxial Fe100-xGax/MgO(001) films 2018 Access copy available to the general public Unrestricted In this work we present a study of the structural properties of Fe100-x Gax (x < 30) films grown by Molecular Beam Epitaxy on Mg0(100). We combine long range and local/chemically selective X-ray probes (X-ray Diffraction and X-ray absorption spectroscopy) together with real space imaging by means of Transmission Electron Microscopy and surface sensitive in situ Reflected High Energy Electron Diffraction. For substrate temperature Ts below 400 °C we obtain bcc films while, for x aprox. 24 and Ts >= 400oC the nucleation of the fcc phase is observed. For both systems a Ga anticlustering or local range ordering phenomenon appears. The Ga/Fe composition in the first and second coordination shells of the bcc films is different from that expected for a random Ga distribution and is close to a D03 phase, leading to a minimization of the number Ga-Ga pairs. On the other side, a long-range D03 phase is not observed indicating that atomic ordering only occurs at a local scale. Overall, the epitaxial growth procedure presented in this work, first, avoids the formation of a long range ordered D03 phase, which is known to be detrimental for magnetostrictive properties, and second, demonstrates the possibility of growing fcc films at temperatures much lower than those required to obtain bulk fcc samples. info:eu-repo/grantAgreement/ES/DGA/E10-17D info:eu-repo/grantAgreement/ES/MICINN/MAT2012-31309 info:eu-repo/grantAgreement/ES/MICINN/MAT2015-66726-R info:eu-repo/grantAgreement/ES/MINECO/BES-2016-076482 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 4.175 2018 MATERIALS SCIENCE, MULTIDISCIPLINARY 65 / 293 = 0.222 2018 Q1 T1 METALLURGY & METALLURGICAL ENGINEERING 6 / 76 = 0.079 2018 Q1 T1 CHEMISTRY, PHYSICAL 47 / 148 = 0.318 2018 Q2 T1 1.065 2018 Materials Chemistry 2018 Q1 Metals and Alloys 2018 Q1 Mechanics of Materials 2018 Q1 Mechanical Engineering 2018 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0003-4079-2658 Proietti, Maria Grazia Universidad de Zaragoza Corredor, Edna C. (orcid)0000-0001-7673-1297 Coffey, David (orcid)0000-0002-2642-5635 Begué, Adrián (orcid)0000-0001-6117-9858 de la Fuente, César Universidad de Zaragoza (orcid)0000-0002-2624-6004 Arnaudas, José I. Universidad de Zaragoza (orcid)0000-0002-4599-3013 Ibarra, A. Universidad de Zaragoza 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 767 (2018), 905-914 J. alloys compd. JOURNAL OF ALLOYS AND COMPOUNDS 0925-8388 1081731 http://zaguan.unizar.es/record/79723/files/texto_completo.pdf Postprint 58529 http://zaguan.unizar.es/record/79723/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:79723 articulos driver 2020-01-17-21:59:29 ARTICLE