期刊
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
卷 28, 期 7, 页码 1080-1089出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ja50059d
关键词
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资金
- Christian Doppler Laboratory of Ferroic Materials
- Austrian Science Fund (FWF) [F 4509-N16]
- Austrian Science Fund (FWF) [P 21960] Funding Source: researchfish
Oxygen isotope exchange with subsequent time-of-flight secondary ion mass spectrometry (ToF-SIMS) is a highly valuable tool for determining oxygen diffusion coefficients in oxides. Since ToF-SIMS analysis enables an elemental and chemical mapping, it can also be used to visualize oxygen exchange-active zones by determining the local oxygen isotopic fraction. However, measuring accurate isotopic fractions can be a challenging analytical task owing to secondary ion interaction and signal saturation, particularly when dealing with high secondary ion intensities as commonly found when analyzing oxygen ions from oxides. It is shown that in many cases the calculated O-18(-) fraction erroneously shifts to higher values and can lead to systematic errors in the determination of diffusion coefficients. A novel ToF-SIMS operation mode, called Collimated Burst Alignment (CBA) mode, is therefore introduced to enable a more accurate determination of oxygen isotopic fractions with an optimized lateral resolution of sub-100 nm. Both improvements are rendered possible by a modified beam guidance in the primary ion gun. This modification reduces detector dead time effects and ion interactions to a minimum and secondary ion intensities can be obtained more accurately. The result of this optimization is demonstrated in measurements of the natural isotope abundance of several different oxides including SrTiO3 and Sr-doped LaCoO3.
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