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
AbstractA 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.
|Journal series||Journal of the European Ceramic Society, ISSN 0955-2219|
|Publication size in sheets||0.55|
|Keywords in English||Ceramic 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|
|Score|| = 50.0, 28-11-2017, ArticleFromJournal|
= 50.0, 28-11-2017, ArticleFromJournal
|Publication indicators||: 2016 = 3.411 (2) - 2016=3.327 (5)|
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