Tuning the bimetallic amide-imide precursor system to make paramagnetic GaMnN nanopowders

M. Drygas , J.F. Janik , M. Musiał-Karg , Jacek Gosk , A. Twardowski

Abstract

A bimetallic molecular system made of gallium (III) tris(dimethyl)amide Ga(NMe2)3 and manganese (II) bis(trimethylsilyl)amide Mn[N(SiMe3)2]2 (Me = CH3, fixed initial Mn-content 10 at.%) was subjected to ammonolysis in refluxing/liquid ammonia. Upon isolation at room temperature, the amide-imide mixed metal precursor was pyrolyzed at elevated temperatures under an ammonia flow by two different routes. Route 1 consisted of a direct nitridation at high temperatures of 500, 700 or 900 °C. In route 2, a low temperature pyrolysis at 150 °C was applied prior to nitridation at the same final temperatures as in route 1. All nanopowders were characterized by XRD diffraction, FT-IR spectroscopy, and SEM/EDX microscopy and analysis. Thorough magnetization measurements in function of magnetic field and temperature were carried out with a SQUID magnetometer. In all samples, the paramagnetic phase of GaMnN was accompanied by an antiferromagnetic by-product linked to a Mn-containing species from decomposition and oxidation of Mn-precursor excess. The Mn-contents in the crystalline GaMnN, i.e., Mn-incorporated in GaN crystal lattice, were of the order of 2-3 at.% mostly independent on the nitridation route whereas the latter had a pronounced effect on amounts of the antiferromagnetic by-product. © 2016 Elsevier B.V.
Author M. Drygas
M. Drygas,,
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, J.F. Janik
J.F. Janik,,
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, M. Musiał-Karg
M. Musiał-Karg,,
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, Jacek Gosk ZJCS
Jacek Gosk,,
- Solid State Ionics Division
, A. Twardowski
A. Twardowski,,
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Journal seriesMaterials Chemistry and Physics, ISSN 0254-0584
Issue year2016
Vol180
Pages173-183
Publication size in sheets0.5
Keywords in EnglishAmides; Ammonia; Antiferromagnetism; Crystal growth; Magnetic properties; Magnetometers; Nanostructured materials; Nanostructures; Nitridation; Nitrides; Paramagnetism; Pyrolysis; Semiconducting gallium; Temperature, Antiferromagnetics; Direct nitridation; Elevated temperature; Final temperatures; Low-temperature pyrolysis; Magnetization measurements; Paramagnetic phase; SQUID magnetometers, Manganese
DOIDOI:10.1016/j.matchemphys.2016.05.061
URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-84973864007&partnerID=40&md5=1def25123890ca7d018bde2ad8190cc5
Languageen angielski
File
metchemphys2016.pdf 2.76 MB
Score (nominal)35
ScoreMinisterial score [Punktacja MNiSW] = 30.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) [Punktacja MNiSW (2013-2016)] = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2016 = 2.084 (2) - 2016=2.283 (5)
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