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Yamagami K, Yoshino H, Yamagishi H, Setoyama H, Tanaka A, Ohtani R, Ohba M, Wadati H. The ligand field in low-crystallinity metal-organic frameworks investigated by soft X-ray core-level absorption spectroscopy. Phys Chem Chem Phys 2022; 24:16680-16686. [PMID: 35766583 DOI: 10.1039/d2cp01415g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ligand field (LF) of transition metal ions is a crucial factor in realizing the mechanism of novel physical and chemical properties. However, the low-crystallinity state, including the amorphous state, precludes the clarification of the electronic structural relationship of transition metal ions using crystallographic techniques, ultraviolet and infrared optical methods, and magnetometry. Here, we demonstrate that soft X-ray 2p → 3d core-level absorption spectroscopy (L2,3-edge XAS) systematically revealed the local 3d electronic states, including in the LF, of nitrogen-coordinated transition-metal ions for low-crystallinity cyanide-bridged metal-organic frameworks (MOFs) M[Ni(CN)4] (MNi; M = Mn, Fe, Co, Ni) and Ni[Pd(CN)4] (NiPd). In NiNi and NiPd, N-coordinated Ni ions with square-planar symmetry exhibit strong orbital hybridization and ligand-to-metal charge transfer effects. In MnNi, FeNi, and CoNi, the correlation between the crystalline electric field splitting in the LF and the transition metal-nitrogen bonding length is revealed using the multiplet LF theory. Regardless of the different local symmetries, our results indicate that L2,3-edge XAS is a powerful tool for gaining element-specific knowledge about the transition-metal ion characterizing the functionality of low-crystallinity MOFs and will be the foundation for an attractive platform, such as adsorption/desorption materials.
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Affiliation(s)
- Kohei Yamagami
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwanoha, Chiba 277-8581, Japan
| | - Haruka Yoshino
- Department of Chemistry, Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.,Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.,Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - Hirona Yamagishi
- Synchrotron Radiation Center, Ritsumeikan University, Kusatsu, Shiga 525-0058, Japan
| | - Hiroyuki Setoyama
- Kyushu Synchrotron Light Research Center, 8-7 Yayoigaoka, Tosu, Saga, 841-0005, Japan
| | - Arata Tanaka
- Department of Quantum Matter, ADSM, Hiroshima University, Higashihiroshima, Hiroshima 739-8530, Japan
| | - Ryo Ohtani
- Department of Chemistry, Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masaaki Ohba
- Department of Chemistry, Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hiroki Wadati
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwanoha, Chiba 277-8581, Japan.,Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
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Balasubramanian P, Joshi SR, Yadav R, de Groot FMF, Singh AK, Ray A, Gupta M, Singh A, Maurya S, Elizabeth S, Varma S, Maitra T, Malik V. Electronic structure of Pr 2MnNiO 6 from x-ray photoemission, absorption and density functional theory. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:435603. [PMID: 30215386 DOI: 10.1088/1361-648x/aae168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The electronic structure of double perovskite Pr2MnNiO6 was studied using core x-ray photoelectron spectroscopy and x-ray absorption spectroscopy. The 2p x-ray absorption spectra show that Mn and Ni are in 4+ and 2+ states respectively. Based on charge transfer multiplet analysis of the 2p XPS spectra of both ions, we find charge transfer energies [Formula: see text] of 3.5 and 2.5 eV for Ni and Mn respectively. The ground state of Ni2+ and Mn4+ ions reveal a higher d electron count of 8.21 and 3.38 respectively as compared to the ionic values. The partial density of states clearly show a charge transfer character of the system for U - J [Formula: see text] 2 eV. The O 1s edge absorption spectra reveal a band gap of 0.9 eV, which is close to the value estimated from analysis of Ni and Mn 2p photoemission and absorption spectra. The combined analysis of nature of spectroscopic data and first principles calculations reveal that the material is a p - d type charge transfer insulator with an intermediate covalent character according to the Zannen-Sawatzy-Allen phase diagram.
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Affiliation(s)
- Padmanabhan Balasubramanian
- Department of Physics, Indian Institute of technology, Roorkee-247667, Uttarakhand, India. Institute of Physics, Bhubaneshwar-750012, India
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3
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Shkvarin AS, Yarmoshenko YM, Merentsov AI, Zhukov YM, Titov AA, Shkvarina EG, Titov AN. Electronic structure of Ni xTiSe 2 (0.05 ≤ x ≤ 0.46) compounds with ordered and disordered Ni. Phys Chem Chem Phys 2017; 19:4500-4506. [PMID: 28120962 DOI: 10.1039/c6cp08130d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic structure of the NixTiSe2 intercalation compounds with disordered and ordered Ni atoms is studied using photoelectron, resonant photoelectron and X-ray absorption spectroscopy, theoretical calculations of the X-ray spectra and density of electronic states. The increase in the covalent component of the chemical bond of Ni and Ti with the nearest neighbour was found with increasing nickel concentration and its ordering. A significant charge transfer from the Ni atoms to the host lattice resulting in the transformation of Ti4+ into Ti3+ occurs, while the symmetry of the crystal lattice is lowered from the hexagonal to the monoclinic one.
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Affiliation(s)
- A S Shkvarin
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620990 Yekaterinburg, Russia.
| | - Yu M Yarmoshenko
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620990 Yekaterinburg, Russia.
| | - A I Merentsov
- Ural Federal University, 620089 Yekaterinburg, Russia
| | - Yu M Zhukov
- Saint Petersburg State University, 198504 St. Petersburg, Russia
| | - A A Titov
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620990 Yekaterinburg, Russia. and Ural Federal University, 620089 Yekaterinburg, Russia
| | - E G Shkvarina
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620990 Yekaterinburg, Russia.
| | - A N Titov
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620990 Yekaterinburg, Russia. and Ural Federal University, 620089 Yekaterinburg, Russia
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Ding Y, Chen CC, Zeng Q, Kim HS, Han MJ, Balasubramanian M, Gordon R, Li F, Bai L, Popov D, Heald SM, Gog T, Mao HK, van Veenendaal M. Novel high-pressure monoclinic metallic phase of V2O3. PHYSICAL REVIEW LETTERS 2014; 112:056401. [PMID: 24580615 DOI: 10.1103/physrevlett.112.056401] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Indexed: 06/03/2023]
Abstract
Vanadium sesquioxide, V2O3, is a prototypical metal-to-insulator system where, in temperature-dependent studies, the transition always coincides with a corundum-to-monoclinic structural transition. As a function of pressure, V2O3 follows the expected behavior of increased metallicity due to a larger bandwidth for pressures up to 12.5 GPa. Surprisingly, for higher pressures when the structure becomes unstable, the resistance starts to increase. Around 32.5 GPa at 300 K, we observe a novel pressure-induced corundum-to-monoclinic transition between two metallic phases, showing that the structural phase transition can be decoupled from the metal-insulator transition. Using x-ray Raman scattering, we find that screening effects, which are strong in the corundum phase, become weakened at high pressures. Theoretical calculations indicate that this can be related to a decrease in coherent quasiparticle strength, suggesting that the high-pressure phase is likely a critical correlated metal, on the verge of Mott-insulating behavior.
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Affiliation(s)
- Yang Ding
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Cheng-Chien Chen
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Qiaoshi Zeng
- Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA
| | - Heung-Sik Kim
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
| | - Myung Joon Han
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
| | | | | | - Fangfei Li
- HPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA and State Key Lab of Superhard Materials, Jilin University, Changchun 130012, China
| | - Ligang Bai
- HiPSEC and Department of Physics, University of Nevada Las Vegas, Las Vegas, Nevada, 89154, USA
| | - Dimitry Popov
- HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
| | - Steve M Heald
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Thomas Gog
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Ho-kwang Mao
- HPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA and HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA and Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, USA and Center for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Pudong, Shanghai 201203, China
| | - Michel van Veenendaal
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA and Department of Physics, Northern Illinois University, De Kalb, Illinois 60115, USA
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Mossanek RJO, Abbate M. Similarities in the screening effects of the core level and valence band spectra of VO2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:375602. [PMID: 21403203 DOI: 10.1088/0953-8984/22/37/375602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We calculated the core level and valence band spectra of VO(2) using an extended cluster model. The distribution of spectral weight is similar in both core level and valence band spectra and is related to the different screening mechanisms. Namely, the low energy structures in the spectra correspond to well screened final states, whereas the poorly screened final states appear at higher energies. The latter produce the charge transfer satellite observed in the core level spectra, and are related to the resonance in the constant initial state spectra of the valence band. The changes in the spectral weight across the metal-insulator transition are due to the different non-local screening channels present in each phase, and are also similar in both core level and valence band spectra. The calculation also shows a relatively large O 2p contribution in both spectra, which, in turn, helps to explain the enhancement of the coherent feature at higher photon energies. This suggests that the incoherent peak cannot be solely attributed to the lower Hubbard band.
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Affiliation(s)
- R J O Mossanek
- Departamento de Física, Universidade Federal do Paraná, Curitiba PR, Brazil
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Szytuła A, Jezierski A, Winiarski A, Penc B, Tran VH. Photoemission studies and electronic structure of U(2)T(2)In (T = Ni, Rh, Pt) compounds. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2006; 18:4355-4370. [PMID: 21690787 DOI: 10.1088/0953-8984/18/17/021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The electronic structure of the tetragonal U(2)T(2)In (T = Ni, Rh, Pt) compounds in the paramagnetic phase were studied by x-ray photoelectron spectroscopy (XPS). Both valence band and core level spectra were analysed. The experimental data are compared with the calculations of the density of states using the tight-binding linear muffin-tin orbital method (TB-LMTO) and full-potential local-orbital full-relativistic method (FPLO). The calculated data reveal a dominant U 5f electron character for the states near the Fermi level E(F) with a small contribution from U 5d, Ni 3d, Rh 4d, Pt 5d and In 5p states. The XPS valence bands of these compounds are characterized by a sharp peak of the U 5f states near the Fermi level (E(F)) and broad peaks of the Ni 3d, Rh 4d and Pt 5d states at about 2.6, 3.2 and 4.0 eV below E(F), respectively. The small change in the position of the U 5f peak with respect to E(F) is -0.35 eV for T = Ni and -0.15 eV for T = Rh and Pt. A satellite between the Ni 2p(1/2) and Ni 2p(3/2) peaks is visible, suggesting that the Ni 3d band is not completely filled, and the existence of a small induced magnetic moment on the Ni atoms cannot be ruled out.
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Affiliation(s)
- A Szytuła
- M Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
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Horiba K, Taguchi M, Chainani A, Takata Y, Ikenaga E, Miwa D, Nishino Y, Tamasaku K, Awaji M, Takeuchi A, Yabashi M, Namatame H, Taniguchi M, Kumigashira H, Oshima M, Lippmaa M, Kawasaki M, Koinuma H, Kobayashi K, Ishikawa T, Shin S. Nature of the well screened state in hard X-ray Mn 2p core-level photoemission measurements of La1-xSrxMnO3 films. PHYSICAL REVIEW LETTERS 2004; 93:236401. [PMID: 15601180 DOI: 10.1103/physrevlett.93.236401] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2004] [Indexed: 05/24/2023]
Abstract
Using hard x-ray (HX; hnu=5.95 keV) synchrotron photoemission spectroscopy (PES), we study the intrinsic electronic structure of La(1-x)Sr(x)MnO(3) (LSMO) thin films. Comparison of Mn 2p core-levels with soft x-ray (SX; hnu approximately 1000 eV) PES shows a clear additional well-screened feature only in HX PES. Takeoff-angle dependent data indicate its bulk (> or =20 A) character. The doping and temperature dependence track the ferromagnetism and metallicity of the LSMO series. Cluster model calculations including charge transfer from doping-induced states show good agreement, confirming this picture of bulk properties reflected in Mn 2p core-levels using HX PES.
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Affiliation(s)
- K Horiba
- Soft X-Ray Spectroscopy Laboratory, RIKEN/SPring-8, Mikazuki-cho, Hyogo 679-5148, Japan.
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Charge-Excitation Final States: Satellites. ACTA ACUST UNITED AC 2003. [DOI: 10.1007/978-3-662-09280-4_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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9
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Hattori Y, Konishi T, Kaneko K. XAFS and XPS studies on the enhancement of methane adsorption by NiO dispersed ACF with the relevance to structural change of NiO. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00154-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Turner NH, Schreifels JA. Surface Analysis: X-ray Photoelectron Spectroscopy and Auger Electron Spectroscopy. Anal Chem 1998. [DOI: 10.1021/a19800139] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Noel H. Turner
- Chemistry Division, Naval Research Laboratory, Washington, D.C. 20375-5342
| | - John A. Schreifels
- Department of Chemistry, George Mason University, Fairfax, Virginia 22030
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Mizokawa T, Fujimori A. Self-energy correction to unrestricted Hartree-Fock solutions of lattice models for 3d transition-metal oxides. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:R4201-R4204. [PMID: 9984069 DOI: 10.1103/physrevb.53.r4201] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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