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Above room-temperature ferromagnetism in GaN powders by calcinations with CuO
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Portland State University, United States .
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2006 (English)In: Mater Res Soc Symp Proc, 2006, 62-67 p.Conference paper, Published paper (Refereed)
Abstract [en]

Gallium nitride powders were calcined with copper oxide in either air or N2 and analyzed by means of powder X-ray diffraction (XRD), high-resolution parallel illumination (HRTEM) and scanning probe transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDXS), and electron energy loss spectroscopy (EELS) in order to address the structural and electronic effects of Cu-incorporation into GaN. Gallium oxide and multiple copper oxide phases corresponding to the calcination environment were detected. Significant changes in the lattice parameters and electronic structure of the N2-processed GaN indicate incorporation of both copper and oxygen into the GaN lattice as well as changes in the chemical bonding due to the calcinations process. SQUID magnetometer measurements at 300 K demonstrated ferromagnetism in selected samples.

Place, publisher, year, edition, pages
2006. 62-67 p.
Series
Materials Research Society Symposium Proceedings, ISSN 0272-9172 ; 941
Keyword [en]
Electronic effects, Gallium oxide, Scanning probe transmission electron microscopy (STEM), Calcination, Copper oxides, Electron energy loss spectroscopy, Energy dispersive spectroscopy, Ferromagnetism, High resolution transmission electron microscopy, Lattice constants, Powders, X ray powder diffraction, Gallium nitride
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-155407Scopus ID: 2-s2.0-33947701670ISBN: 1558998985 (print)ISBN: 9781558998988 (print)OAI: oai:DiVA.org:kth-155407DiVA: diva2:768763
Conference
2006 MRS Spring Meeting; San Francisco, CA; United States; 17 April 2006 through 21 April 2006
Note

QC 20141204

Available from: 2014-12-04 Created: 2014-11-05 Last updated: 2016-12-09Bibliographically approved

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