Szczegóły publikacji
Opis bibliograficzny
Structural and magnetic properties of GaN/Mn nanopowders prepared by an anaerobic synthesis route / Mariusz DRYGAŚ, Jerzy F. JANIK, Mirosław M. BUĆKO, Jacek Gosk, Andrzej Twardowski // RSC Advances [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 2046-2069. — 2015 — vol. 5 iss. 47, s. 37298–37313. — Wymagania systemowe: Adobe Reader. — Bibliogr. s. 37312–37313. — Publikacja dostępna online od: 2015-04-16
Autorzy (5)
- AGHDrygaś Mariusz
- AGHJanik Jerzy Franciszek
- AGHBućko Mirosław
- Gosk Jacek B.
- Twardowski Andrzej
Dane bibliometryczne
| ID BaDAP | 89018 |
|---|---|
| Data dodania do BaDAP | 2015-05-25 |
| Tekst źródłowy | URL |
| DOI | 10.1039/c5ra02831k |
| Rok publikacji | 2015 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | RSC Advances |
Abstract
A new oxygen-free molecular precursor system based on (i) ammonolysis in refluxing/liquid NH3 of selected mixtures of gallium tris(dimethyl)amide Ga(NMe2)3 and manganese bis(trimethylsilyl)amide Mn[N(SiMe3)2]2 (Me = CH3, initial Mn-contents = 0.1, 5, 20, 50 at.%) followed by (ii) pyrolysis under flowing ammonia gas at 500, 700, and 900 °C afforded a range of nanocrystalline powders in the GaN/Mn system. The nanopowders were characterized mainly by powder XRD diffraction, FT-IR spectroscopy, Raman spectroscopy, SEM/EDX morphology examination, and XRF elemental analysis. Magnetization measurements as a function of magnetic field and temperature were carried out with a SQUID magnetometer. Structurally, the materials were shown to be single-phases based on the gallium nitride lattice. The presence of small quantities of residual amorphous Mn/N/Si/C species due to an incomplete transamination/removal of the trimethylsilylamide groups during ammonolysis was deduced from the XRF, FT-IR, Raman, and magnetization data. Magnetic properties for all nanopowders consistently pointed to a paramagnetic GaMnN phase with antiferromagnetic interactions among Mn-centers that under favorable circumstances reached the level of 3.8 at.% Mn. The paramagnetic phase was accompanied by a residual antiferromagnetic phase due to a facile oxidation in air of excessive Mn-containing by-products. © The Royal Society of Chemistry.2015.
