Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 20, Pages 7221-7224Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja502277r
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Funding
- MEXT, Element Strategy Initiative to form a research core
- FIRST program, JSPS
- Grants-in-Aid for Scientific Research [25287081] Funding Source: KAKEN
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Compositionally tunable vanadium oxyhydrides Sr2VO4-xHx (0 <= x <= 1.01) without considerable anion vacancy were synthesized by high-pressure solid-state reaction. The crystal structures and their properties were characterized by powder neutron diffraction, synchrotron X-ray diffraction, thermal desorption spectroscopy, and first-principles density functional theory (DFT) calculations. The hydrogen anions selectively replaced equatorial oxygen sites in the VO6 layers via statistical substitution of hydrogen in the low x region (x < 0.2). A new orthorhombic phase (Immm) with an almost entirely hydrogen-ordered structure formed from the K2NiF4-type tetragonal phase with x > 0.7. Based on the DFT calculations, the degree of oxygen/hydrogen anion ordering is strongly correlated with the bonding interaction between vanadium and the ligands.
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