Changes of electron density and defects distribution in binary and ternary iron alloys studied by positron annihilation

Abstract

Properties of binary and ternary iron based alloys doped by different additions were investigated. It was shown for binary alloys containing chromium, molybdenum and tungsten were that results of doping by 0.8% molybdenum and tungsten were similar to those for the sample doped by 9%chromium. Ternary alloys containing chromium and less amounts of molybdenum, tungsten and vanadium were investigated as well. Two types of defects were observed: divacancies and cluster-like defects. It was shown that the electron density in ternary alloys is similar to that in binary alloys containing 0.8% molybdenum.

Use of nuclear physics methods for investigation of short-range ordering and defects in iron based simulatuing alloys

“…The investigations of the electron changes were carried out using the positron annihilation spectroscopy (PAS) with positrons lifetime detection, since this technique is the most sensitive to changes of integral electron density. The experiments confirming the usefulness of our ideas were described in [4,10]. We used in these experiments a standard ORTEC lifetime spectrometer with the time resolution 260 ps.…”

“…properties in binary and ternary iron alloys were studied in ref. [10]. It was supposed that the positron was captured during its staying in the non-defective region.…”

“…There are only 6 vacancies in such clusters (see table 3). Their size can be estimated in the manner described in [10]. It is 2.6 Å.…”

Full Potential Linearized Augmented Plane Wave Calculations of Electron and Positron Energy Levels in TlBr and TlCl

“…To investigate the electronic structure of metals. The use of positron annihilation in solids has been identified by researchers as a viable technique for acquiring insights into the momentum distribution of electrons [11]. This approach can serve as a valuable tool for gaining a deeper understanding of the behavior of electrons in materials and their properties under certain conditions.…”