Rare Earth Research

Survey on tables and figures containing data on alloys and compounds between 3d-elements and Cu, Ag and Au, respectively.

Alloys and compounds of 3d elements with main group elements

Phase equilibria in the Fe–La–Si ternary system

Publisher Summary This chapter discusses the compounds of transition elements with nonmetals The ferromagnetism of transition metal intermetallic compounds are covered by Booth The compounds of transition metals with nonmetallic and semimetallic elements are described The scope of the combined physics and chemistry conference series International Conference of Solid Compounds of Transition Elements is reviewed However, sulfides are only treated when there is a direct connection to related selenides and tellurides The chapter discusses ferromagnetism, ferri-, antiferro-, and helimagnetism The compounds are listed according to the stoichiometric composition in the chapter The large groups TX and T 2 X, TT’X, where T is a transition element and X a nonmetal element is emphasized Various T m X n compounds are also described The compounds are arranged according to the nonmetallic elements of the third, fourth, fifth, and sixth group of the periodic table In the chemical formulas, the elements are arranged according to increasing atomic number The magnetic phase diagrams are presented according to the same rule The chapter also presents a survey of the relevant crystallographic structures

Chapter 3 Compounds of transition elements with nonmetals

Investigations of the system Mn5(Ge1-xSix)3, (with 0 ≦ X ≦ 1) show that a continuous series of solid solutions can be obtained over the complete concentration range. Curie temperature and magnetization measurements at 4.2 K show that the system is ferromagnetic in the concentration range 0 ≦ X ≦ 0.75. For X = 0.8 it becomes antiferromagnetic, however Weiss temperature determinations indicate that the ferromagnetic interaction is still prevalent. Thus the magnetic structure goes over into a ferromagnetic arrangement at about 40 kOe at 4.2 K. In the concentration range 0 ≦ X ≦ 0.8 the measured mean ferromagnetic moment per manganese atom decreases slowly from 2.60 to 2.07 μB/Mn atom. Then with increasing Si concentration the antiferromagnetic interaction becomes more and more important.



Notre etude montre que dans tout l'intervalle de concentration 0 ≦ X ≦ 1, le systeme Mn5(Ge1−xSix)3 donne lieu a une serie continue de solutions solides. Des mesures de points de Curie et d'aimantation a 4,2 K montrent que le systeme est ferromagnetique dans l'intervalle de concentration 0 ≦ X ≦ 0,75. Pour X = 0,8 la structure devient antiferromagneetique avec cependant une interaction ferromagnetique preponderante comme le laisse prevoir la determination des temperatures de Weiss 0, il en resulte qu'un basculement vers une disposition ferromagnetique est observe dans un champ de l'ordre de 40 kOe. Jusqu'a cette concentration le moment ferromagnetique moyen mesure decroit lentement de 2,60 a 2,07 μB/Mn at. Pour des concentrations en Si superieures a 0,8 les interactions antiferro-magnetiques deviennent de plus en plus fortes.

K.S.V.L. Narasimhan

Papers

Magnetism and bonding in a D88 structure; Mössbauer and magnetic investigation of the system Mn5Si3-Fe5Si3

Magnetic investigations on AlB2 type structures

Mössbauer and magnetic investigation of the system Mn5−xFexGe3 (x = 0.5, 1.0 and 1.5)