2024-03-28T15:45:26Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00028226
2023-01-16T04:20:41Z
320:321:322
Infrared spectroscopy on electronic structures of platinum-group metal pernitrides MN2 (M=Ru, Rh, Ir, and Pt)
Soda, Kazuo
91910
Komabuchi, Mai
91911
Maeguchi, Keisuke
91912
Kato, Masahiko
91913
Terabe, Toshiki
91914
Niwa, Ken
91915
Hasegawa, Masashi
91916
Ikemoto, Yuka
91917
Okamura, Hidekazu
91918
Infrared reflectance spectra
First-principles calculation
Platinum-group metal pernitride
Valence band electronic structure
The electronic structures of platinum-group metal pernitrides MN2 (M = Ru, Rh, Ir, and Pt) were investigated via synchrotron radiation infrared spectroscopy and first-principles calculations. Measured reflectance spectra of marcasite-type RuN2 and RhN2 showed Drude-like responses, approaching 1 as the photon energy was decreased, whereas reflectance of arsenopyrite-type IrN2 and pyrite-type PtN2 became ∼0.3 in the low photon energy region with a few features. These findings agreed well with the predictions of the metallic nature of marcasite-type RuN2 and RhN2 and the semiconducting properties of arsenopyrite-type IrN2 and pyrite-type PtN2, respectively. The measured reflectance spectra were also reasonably consistent with the calculated optical responses. The band gaps of IrN2 and PtN2 were estimated to be 0.8 and 2.1 eV, respectively, via first-principles calculation with a modified Becke–Johnson (MBJ) potential for the exchange potential.
ファイル公開:2021-04-01
journal article
Elsevier
2019-04-01
application/pdf
Physica B: Condensed Matter
558
54
58
0921-4526
https://nagoya.repo.nii.ac.jp/record/28226/files/IR_MN2_rev3_soda.pdf
eng
https://doi.org/10.1016/j.physb.2019.01.017
© 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/