Quasielastic thermal neutron scattering experiment on the proton conductor SrCe0.95Yb0.05H0.02O2.985

被引：113

作者：

Matzke, T

Stimming, U

Karmonik, C

Soetratmo, M

Hempelmann, R

Guthoff, F

机构：

[1] UNIV SAARLAND, D-66123 SAARBRUCKEN, GERMANY

[2] HAHN MEITNER INST BERLIN GMBH, D-1000 BERLIN, GERMANY

[3] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST ENERGIEVERFAHRENSTECH, JULICH, GERMANY

来源：

SOLID STATE IONICS | 1996年 / 86-8卷

关键词：

proton conductor; quasielastic neutron scattering; thermal neutrons;

D O I：

10.1016/0167-2738(96)00223-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

On the basis of a QENS experiment using thermal neutrons on the proton conductor SrCe0.95Yb0.05H0.02O2.985 we extend our two-state model for the proton diffusion in this compound. This model was developed from a recent high resolution QENS experiment using cold neutrons, with the first state representing free diffusion of the protons (jumping from oxygen to oxygen forming OH-; free state) and the second state representing protons trapped on energetically lowered sites (nearby an Yb3+ ion on a Ce4+ site; trapped state); into this model we integrate a very fast localized motion taking place in the free state as a reorientation of the OH- ions. This motion is visible as a broad quasielastic component in the neutron energy spectra and exhibits a very low activation energy.

引用

页码：621 / 628

页数：8

共 13 条

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