Influence of Lattice Defects on Optical Properties and Electronic Structure of Ni50Ga50
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Thomas Hradecny
Abstract
The change of the optical properties of the ordered intermetallic Hume-Rothery phase NiGa as a function of the concentration of lattice defects was measured by differential reflectometry. The lattice defects were produced by changing the composition and quenching from high temperatures. The electron bandstructure of Ni50Ga50 was calculated with the augmented-plane-wave method. The comparison between measured and calculated results shows that the changes in the spectra could be explained with a rigidband model. The existence of free electrons in NiGa was confirmed.
Abstract
Die Änderung der optischen Eigenschaften der geordneten intermetallischen Phase Ni50Ga50 als Funktion der Konzentration von Gitterfehlern wurde mittels Differenzreflexionsspektroskopie untersucht. Die Einstellung der Gitterfehler erfolgte durch Variation der Zusammensetzung und durch Abschrecken von hohen Temperaturen. Die Elektronenbandstruktur von Ni50Ga50 wurde mit der APW-Methode (augmented-plane-wave method) berechnet. Der Vergleich zwischen gemessenen und berechneten Werten zeigte, daß die Änderungen in den Spektren durch ein einfaches StarrBand-Modell erklärt werden können. Das Vorhandensein von freien Elektronen in Ni50Ga50 wurde bestätigt.
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© 1997 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Aufsätze
- A Thermodynamic Description for the Ternary Cu–Mg–Zn System
- Formation of Thermodynamically Metastable Phases in the Ta–Co, Ta–Ni, and Ta–Cu Systems by Mechanical Alloying
- The Application of Thermodynamics to the In-situ Processing of Aluminum-modified MoSi2 Composites
- Thermodynamics of Liquid Cu–Si and Cu–Zr Alloys
- The Section (Fe0.5Ni0.5)xSb1-x: Phase Relationships and Thermodynamic Properties
- Adsorption Study of Water on Gold Using the Quartz-crystal Microbalance Technique: Assessment of BET and FHH Models of Adsorption
- Evaluation of a Model of Stress-induced Martensite Formation in NiTi Sheet
- Influence of Lattice Defects on Optical Properties and Electronic Structure of Ni50Ga50
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Fortbildungspraktikum
- Buchbesprechungen
- Terminkalender
Articles in the same Issue
- Frontmatter
- Aufsätze
- A Thermodynamic Description for the Ternary Cu–Mg–Zn System
- Formation of Thermodynamically Metastable Phases in the Ta–Co, Ta–Ni, and Ta–Cu Systems by Mechanical Alloying
- The Application of Thermodynamics to the In-situ Processing of Aluminum-modified MoSi2 Composites
- Thermodynamics of Liquid Cu–Si and Cu–Zr Alloys
- The Section (Fe0.5Ni0.5)xSb1-x: Phase Relationships and Thermodynamic Properties
- Adsorption Study of Water on Gold Using the Quartz-crystal Microbalance Technique: Assessment of BET and FHH Models of Adsorption
- Evaluation of a Model of Stress-induced Martensite Formation in NiTi Sheet
- Influence of Lattice Defects on Optical Properties and Electronic Structure of Ni50Ga50
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Fortbildungspraktikum
- Buchbesprechungen
- Terminkalender
