title: Reduction of electron channeling in EDS using precession.
abstract: We demonstrated that EDS measurement can be significantly improved by precessing the electron beam, thereby reducing electron channeling effects. For a SrTiO3 specimen orientated along the [001] zone axis, the measured strontium to titanium atomic ratio was 0.74-0.80 using conventional EDS methods, and the ratio was improved to ~0.99 by precessing the electron beam for angles greater than 22.54 mRad. In ALCHEMI-like experiments in which the specimen was tilted to near two-beam condition, the strontium to titanium ratio was insensitive to the deviation from the Bragg condition using a precessed electron beam. Similar reduction of electron channeling effects was also observed in precession-assisted EDS measurements for an L21-ordered Fe2MnAl intermetallic alloy tilted to the [011] zone axis as well as near two-beam conditions.
authors: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA. Yifeng.Liao@gmail.com
authors: Yifeng
authors: Y
authors: Liao
authors: Laurence D
authors: LD
authors: Marks
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