A laser spectroscopic study of Nd-doped zirconia

[摘要] High-surface-area rare-earth (RE) modified zirconia powders prepared by solution methods can be used as catalytic support of noble metals and as electrolyte oxygen sensors in an automobile exhaust-emission-control system. A previous neutron-scattering study showed that substituting zirconium with trivalent RE ions not only stabilizes the cubic and tetragonal phases over a wide range of temperatures, but also creates oxygen vacancies in the RE-Zr oxide solid solution. This work focuses on the fluorescence of Nd in Nd0.1Zr0.9O1.95 powders under laser excitation of the Nd3+ ground state to the (4)G(7/2) states. Distinct features were observed at 8 K in the I-4(9/2) --> (4)G(7/2) excitation and F-4(3/2) --> I-4(9/2) emission spectra using two sets of incident and emission frequencies, respectively. The results are discussed in terms of site-sensitive local structures surrounding the Nd ions in the two-phased oxide structure.

[发布日期] 1997-03-20

[效力级别]  Proceedings Paper

[关键词] site-selective spectroscopy;fluorescence;rare-earth modified zirconia;zirconia catalytic support