Structural and magnetic properties of ceramics prepared by high-pressure high-temperature sintering of manganese-doped gallium nitride nanopowders

M. Drygas , J.F. Janik , Jacek Gosk , S. Gierlotka , B. Pałosz , A. Twardowski


A precursor system made of Ga(NMe2)3 and Mn[N(SiMe3)2]2 (Me=CH3, initial Mn-contents 5, 10, 20at.%) upon ammonolysis in refluxing ammonia afforded Ga/Mn amide-imide precursors. The 10at.% Mn-precursor was nitrided at 500, 700, and 900°C. The 5 and 20at.% Mn-precursors were nitrided only at 900°C. All nanopowders were characterized by XRD, FT-IR, SEM/EDX, whereas some by Raman spectroscopy and XRF. Magnetization measurements were performed with a SQUID magnetometer. Each nanopowder was subjected to no additive high-pressure high-temperature sintering, 7GPa, 1000°C, 10min, affording ceramic pellets. Their structural and magnetic properties were examined to appraise an extent of Mn-incorporation into GaN under sintering conditions. In all samples, the paramagnetic phase of (Ga, Mn)N was accompanied by an antiferromagnetic residue, the latter resulting from oxidation of air sensitive Mn-excess by-products. (Ga, Mn)N in the ceramics showed increased Mn-contents about 1.6 times higher than in the parent nanopowders. © 2015 Elsevier Ltd.
Author M. Drygas
M. Drygas,,
, J.F. Janik
J.F. Janik,,
, Jacek Gosk ZJCS
Jacek Gosk,,
- Solid State Ionics Division
, S. Gierlotka
S. Gierlotka,,
, B. Pałosz
B. Pałosz,,
, A. Twardowski
A. Twardowski,,
Journal seriesJournal of the European Ceramic Society, ISSN 0955-2219
Issue year2016
Publication size in sheets0.55
Keywords in EnglishCeramic materials; Gallium nitride; Lanthanum compounds; Magnetic properties; Magnetometers; Nanostructured materials; Sintering; Structural ceramics, Antiferromagnetics; High pressure high temperature sintering; Magnetization measurements; Paramagnetic phase; Precursor systems; Sintering condition; SQUID magnetometers; Structural and magnetic properties, Manganese
Languageen angielski
1gosk2016ceramic.pdf / 2.53 MB / 1gosk2016ceramic.pdf 2.53 MB
Score (nominal)50
ScoreMinisterial score = 50.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 50.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.411 (2) - 2016=3.327 (5)
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