期刊
CHEMISTRY OF MATERIALS
卷 20, 期 19, 页码 5987-5996出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm800666p
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government [19685019, 19051007, 16GS0205]
- Grants-in-Aid for Scientific Research [19685019, 19051007] Funding Source: KAKEN
A new synthetic route via a solid-state reaction, the crystal Structure of 12SrO center dot 7Al(2)O(3) (S(12)A(7)) incorporated with OH- ions, and the formation of oxygen radical anions in S12A7 have been examined. Investigations using X-ray powder diffraction and thermogravimetric and evolved gas combined analyses demonstrate that homogenization promoted by molten Sr(OH)(2) hydrates and the presence of Sr-hydrogarnet precursors play crucial roles in the formation of S(12)A(7). Rietveld analyses confirm the lattice framework of S(12)A(7) has a structure identical to that of the nanoporous crystal 12CaO center dot 7Al(2)O(3) (C(12)A(7), a mayenite structure) and demonstrate that two Sr2+ ions (pole Sr2+ ions) on the S-4 axis of a cage displace toward the cage center owing to the accommodation of an OH- ion. An electron paramagnetic resonance study demonstrates that oxygen radical anions, O-2(-) and O-, are generated in the cages with concentrations on the order of 10(20) cm(-3) each by oxygen annealing. From the g-values observed at 77 K, the oxygen radical anions are interpreted as being sandwiched between the two pole Sr2+ ions rather than adsorbed on one side.
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