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Journal Articles

Electronic structure of lithium amide

Kamakura, Nozomu; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Tsubota, Masami*; Paik, B.*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; Kato, Yukako*; et al.

Physical Review B, 83(3), p.033103_1 - 033103_4, 2011/01

 Times Cited Count:5 Percentile:25.44(Materials Science, Multidisciplinary)

The electronic structure of lithium amide, which is lightweight complex hydride expected as a high-capacity hydrogen storage material, is investigated by N 1$$s$$ soft X-ray emission spectroscopy (XES) and absorption spectroscopy (XAS). The overall feature of the electronic structure of lithium amide by the XES and XAS is consistent with the band calculation, while the strongly hybridized state with H 1$$s$$ is located at higher binding energy than the band calculation.

Journal Articles

Electronic structure of La(Fe$$_{0.88}$$Si$$_{0.12}$$)$$_{13}$$

Kamakura, Nozomu; Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Fujita, Asaya*; Fujieda, Shun*; Fukamichi, Kazuaki*

Materials Research Society Symposium Proceedings, Vol.1262, 6 Pages, 2010/10

Oral presentation

Electronic states of La(Fe$$_{0.88}$$Si$$_{0.12}$$)$$_{13}$$

Kamakura, Nozomu; Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi

no journal, , 

no abstracts in English

Oral presentation

Electronic states of lithium amide studied by soft X-ray emission spectroscopy

Kamakura, Nozomu; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Electronic structure of lithium amide

Kamakura, Nozomu; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Electronic states of hydrogen storage material

Kamakura, Nozomu

no journal, , 

no abstracts in English

Oral presentation

Electronic states of lithium amide

Kamakura, Nozomu

no journal, , 

Here, the electronic structure of lithium amide LiNH$$_{2}$$, which is expected as a candidate for high capacity hydrogen storage materials, is presented. In this study, the electronic structure of insulator lithium amide has been investigated by N 1$$s$$ soft X-ray emission (XES) and absorption (XAS) spectroscopies. The XES and XAS spectra show a band gap between the valence and conduction bands. The valence bands consist of three peaks, which extend up to $$sim$$ 8 eV from the valence band top. These features are consistent with the calculation. The high binding energy peak in the XES spectrum is attributed to the N 2$$p$$ state strongly hybridized with H 1$$s$$ state. The bonding between N and H in the amide ion [NH$$_{2}$$]$$^{-1}$$ has been discussed in the presentation.

Oral presentation

Electronic states of La(Fe$$_{0.88}$$Si$$_{0.12}$$)$$_{13}$$

Kamakura, Nozomu; Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi

no journal, , 

La(Fe$$_{0.88}$$Si$$_{0.12}$$)$$_{13}$$ is expected for the practical application using the magnetic transition temperature controlled by hydrogen absorption. In this study, the electronic structure of La(Fe$$_{0.88}$$Si$$_{0.12}$$)$$_{13}$$ which shows the first order paramagnetic-ferromagnetic transition is investigated by soft X-ray photoemission spectroscopy at BL23SU of SPring-8. The valence band photoemission spectrum of La(Fe$$_{0.88}$$Si$$_{0.12}$$)$$_{13}$$ shows the temperature dependence originating from the exchange splitting of Fe 3d band across the Curie temperature. The Fe 3s core-level photoemission spectra below and above the Curie temperature exhibit the exchange splitting of $$sim$$ 4.3 eV due to the local moment of Fe. In the session, the temperature dependent electronic structure across the first order magnetic transition has been presented.

Oral presentation

Electronic states of lithium amide

Kamakura, Nozomu; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Tsubota, Masami*; Paik, B.*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; Kinoshita, Toyohiko*

no journal, , 

Lithium amide (LiNH$$_{2}$$) is lightweight complex hydride expected as a high-capacity hydrogen storage material. The electronic structure of lithium amide (LiNH$$_{2}$$) is investigated by soft X-ray emission spectroscopy (XES) and absorption spectroscopy (XAS). The unoccupied and occupied parts of the N 2$$p$$ partial density of states are studied by N 1$$s$$ XAS in the fluorescence yield mode and XES using soft X-ray (h$$nu$$=425eV) of SPring-8. The XES and XAS spectra show a band gap between the valence and conduction bands. The valence band in the XES spectrum consists of three peaks, which extend up to $$sim$$ -8eV from the valence band top. The overall feature of the electronic structure of lithium amide by the XES and XAS is consistent with the band calculation. The strongly hybridized state with H 1$$s$$ observed on the high binding energy side in the XES is discussed.

Oral presentation

Electronic states of amide hydrides

Kamakura, Nozomu; Takeda, Yukiharu; Okane, Tetsuo; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Miyaoka, Hiroki*; Tsubota, Masami*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Electronic states of alkali metal amide and alkaline earth metal amide

Kamakura, Nozomu; Yamagami, Hiroshi; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Miyaoka, Hiroki*; Tsubota, Masami*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; et al.

no journal, , 

In this research, the electronic states of the insulator alkali metal amide ($$mathrm{KNH_2}$$, $$mathrm{NaNH_2}$$) and alkaline earth metal amide ($$mathrm{Ca(NH_{2})_{2}}$$), which are lightweight complex hydrides being considered as a high-capacity hydrogen storage material, are investigated by the soft X-ray emission (XES)and absorption spectroscopies. The sharp three peak structure commonly observed in the XES spectrum of alkali metal amides shows the localized character of the valence electrons, while the importance of the number of the amide ion is shown by the XES spectrum of $$mathrm{Ca(NH_{2})_{2}}$$ which is clearly different from that of alkali metal amide. The comparison with the band calculation clarifies the electronic sates of $$mathrm{Ca(NH_{2})_{2}}$$.

Oral presentation

Electronic states of alkali metal amide and alkaline earth metal amide

Kamakura, Nozomu; Takeda, Yukiharu; Yamagami, Hiroshi; Miyaoka, Hiroki*; Tsubota, Masami*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; Kinoshita, Toyohiko*

no journal, , 

Metal amide has been attracted much attention as a lightweight hydride being considered for high capacity hydrogen storage materials. In this research, the electronic states of the insulator alkali metal amide (KNH$$_{2}$$, NaNH$$_{2}$$) and alkaline earth metal amide (Ca(NH$$_{2}$$)$$_{2}$$, Mg(NH$$_{2}$$)$$_{2}$$) are investigated by the soft X-ray emission spectroscopy (XES) and absorption spectroscopy (XAS) in the total fluorescence yield mode. The localized character of the valence electrons is shown by the sharp three peak structure commonly observed in the XES spectrum of alkali metal amide. The localized character of the valence electrons is shown by the sharp peak structure commonly observed in the XES spectrum of alkali metal amide. The broadening of the N 2p states by the hybridization is observed in the XES spectrum of the alkaline earth metal amide. Decomposition temperature of the metal amide is found to relate to the character of the chemical bond observed in the XAS.

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