Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1594721 | Solid State Communications | 2008 | 5 Pages |
Abstract
Chromium doped gallium oxynitrides having the wurtzite structure were prepared by ammonia nitridation of oxide precursors derived via the citrate route. The solid solution limits of less than 1 at.% Cr3+ were confirmed by both XRD and EXAFS on the nitrided product at 750Â âC in the wurtzite-type crystal lattice. The doped product was paramagnetic with a small amount of an antiferromagnetic impurity, but there was no ferromagnetic interaction among the doped Cr3+ ions in the gallium oxynitride. Density-functional electronic structure calculations on the basis of a wurtzite-type supercell containing 194 atoms reveal the oxynitride material to be metastable, and confirm the presence of spin-polarized Cr3+ cations located exactly on former Ga3+ tetrahedral sites.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Shinichi Yamamoto, Shinichi Kikkawa, Yuji Masubuchi, Takashi Takeda, Holger Wolff, Richard Dronskowski, Akira Yoshiasa,