期刊
INORGANIC CHEMISTRY
卷 53, 期 13, 页码 6962-6968出版社
AMER CHEMICAL SOC
DOI: 10.1021/ic500891j
关键词
-
资金
- National Science Foundation of China [21101174]
- Chinese Ministry of Education [213030A]
- Program for New Century Excellent Talents in University [NCET-13-0752]
- Guilin University of Technology
- Chinese Ministry of Education Scientific Research Foundation for Returned Scholars
K/Na-doped SrSiO3-based oxide ion conductors were recently reported as promising candidates for low-temperature solid-oxide fuel cells. Sr0.7K0.3SiO2.85, close to the solid-solution limit of Sr1-xKxSiO3-0.5x, was characterized by solid-state Si-29 NMR spectroscopy and neutron powder diffraction (NPD). Differing with the average structure containing the vacancies stabilized within the isolated Si3O9 tetrahedral rings derived from the NPD study, the (29Si) NMR data provides new insight into the local defect structure in Sr0.7K0.3SiO2.85. The Q(1)-linked tetrahedral Si signal in the Si-29 NME. data suggests that the Si3O9 tetrahedral rings in the K-doped SrSiO3 materials were broken, forming Si3O8 chains. The Si3O8 chains can be stabilized by either bonding with the oxygen atoms of the absorbed lattice water molecules, leading to the Q(1)-linked tetrahedral Si, or sharing oxygen atoms with neighboring Si3O9 units, which is consistent with the Q(3)-linked tetrahedral Si signal detected in the Si-29 NMR spectra.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据