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Structure and properties of intermetallic ternary rare earth compounds

Abstract

The so called material science is an always growing field in modern research. For the development of new materials not only the experimental characterization but also theoretical calculation of the electronic structure plays an important role. A class of compounds that has attracted a great deal of attention in recent years is known as REME compounds. These compounds are often referred to with RE designating rare earth, actinide or an element from group 1-4, M representing a late transition metal from groups 8-12, and E belonging to groups 13-15. There are more than 2000 compounds with 1:1:1 stoichiometry belonging to this class of compounds and they offer a broad variety of different structure types. Although many REME compounds are know to exist, mainly only structure and magnetism has been determined for these compounds. In particular, in the field of electronic and transport properties relatively few efforts have been made. The main focus in this study is on compounds crystallizing in MgAgAs and LiGaGe structure. Both structures can only be found among 18 valence electron compounds. The f electrons are localized and therefor not count as valence electrons. A special focus here was also on the magnetoresistance effects and spintronic properties  More>>
Publication Date:
Dec 17, 2008
Product Type:
Thesis/Dissertation
Report Number:
INIS-DE-0505
Resource Relation:
Other Information: TH: Diss. (Dr.rer.nat.)
Subject:
36 MATERIALS SCIENCE; THULIUM COMPOUNDS; ELECTRONIC STRUCTURE; FERROMAGNETISM; MAGNETORESISTANCE; INTERMETALLIC COMPOUNDS; CADMIUM COMPOUNDS; GADOLINIUM COMPOUNDS; GOLD COMPOUNDS; INDIUM COMPOUNDS; MAGNESIUM COMPOUNDS; PALLADIUM COMPOUNDS; NICKEL COMPOUNDS; ERBIUM COMPOUNDS; PRASEODYMIUM COMPOUNDS; SAMARIUM COMPOUNDS; LUTETIUM COMPOUNDS; BISMUTH COMPOUNDS; FERROMAGNETIC MATERIALS; MAGNETIC SEMICONDUCTORS; L-S COUPLING; DYSPROSIUM COMPOUNDS; MAGNETIC FIELDS; TEMPERATURE RANGE 0273-0400 K; CUBIC LATTICES; ENERGY-LEVEL DENSITY; CHEMICAL BONDS; BAND THEORY; MOESSBAUER EFFECT; HEXAGONAL LATTICES; ANTIMONIDES; TIN COMPOUNDS; EXPERIMENTAL DATA
OSTI ID:
21111032
Research Organizations:
Mainz Univ. (Germany). Fachbereich Chemie, Pharmazie und Geowissenschaften
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
TRN: DE08FD041
Availability:
Commercial reproduction prohibited; INIS; OSTI as DE21111032
Submitting Site:
DEN
Size:
117 pages
Announcement Date:
Dec 18, 2008

Citation Formats

Casper, Frederick. Structure and properties of intermetallic ternary rare earth compounds. Germany: N. p., 2008. Web.
Casper, Frederick. Structure and properties of intermetallic ternary rare earth compounds. Germany.
Casper, Frederick. 2008. "Structure and properties of intermetallic ternary rare earth compounds." Germany.
@misc{etde_21111032,
title = {Structure and properties of intermetallic ternary rare earth compounds}
author = {Casper, Frederick}
abstractNote = {The so called material science is an always growing field in modern research. For the development of new materials not only the experimental characterization but also theoretical calculation of the electronic structure plays an important role. A class of compounds that has attracted a great deal of attention in recent years is known as REME compounds. These compounds are often referred to with RE designating rare earth, actinide or an element from group 1-4, M representing a late transition metal from groups 8-12, and E belonging to groups 13-15. There are more than 2000 compounds with 1:1:1 stoichiometry belonging to this class of compounds and they offer a broad variety of different structure types. Although many REME compounds are know to exist, mainly only structure and magnetism has been determined for these compounds. In particular, in the field of electronic and transport properties relatively few efforts have been made. The main focus in this study is on compounds crystallizing in MgAgAs and LiGaGe structure. Both structures can only be found among 18 valence electron compounds. The f electrons are localized and therefor not count as valence electrons. A special focus here was also on the magnetoresistance effects and spintronic properties found among the REME compounds. An examination of the following compounds was made: GdAuE (E=In,Cd,Mg), GdPdSb, GdNiSb, REAuSn (RE=Gd,Er,Tm) and RENiBi (RE=Pr,Sm,Gd-Tm,Lu). The experimental results were compared with theoretic band structure calculations. The first half metallic ferromagnet with LiGaGe structure (GdPdSb) was found. All semiconducting REME compounds with MgAgAs structure show giant magnetoresistance (GMR) at low temperatures. The GMR is related to a metal-insulator transition, and the value of the GMR depends on the value of the spin-orbit coupling. Inhomogeneous DyNiBi samples show a small positive MR at low temperature that depends on the amount of metallic impurities. At higher fields the samples show a negative GMR. Inhomogeneous nonmagnetic LuNiBi samples show no negative GMR, but a large positive MR of 27.5% at room temperature, which is interesting for application. (orig.)}
place = {Germany}
year = {2008}
month = {Dec}
}