Crystallographic/magnetic phase

Fig. 23. Magnetic and crystallographic temperature-composition phase diagram of the Gd5(SixGe x)4 compounds (after Morellon et a). (2000)). FM, PM. AF label different magnetic phases (FM ferromagnetic, PM paramagnetic, AF antiferromagnetic). 0(1), M and 0(11) label different crystallographic structures (0(1) orthorhombic Gd Si4 structure, M monoclinic structure, 0(11) orthorhombic GdsGe4 structure). The solid line marks the first-order magnetostructural phase boundary.

The information on rare earth alloys is vast and nearly incomprehensible, and yet we estimated that perhaps only one half of the possible binary alloy systems with the rare earth metals have been studied in any detail at all. And if one considers in addition all possible ternary and higher component alloys our present day knowledge of rare earth alloys is minuscule. To give the reader an idea of the vastness of our knowledge it would take one person working full time twelve years to compile, critically evaluate and write up his/her evaluation of all of the known crystallographic and phase relationship data of the rare earth binary alloys. If one were to do the same with the thermodynamic, magnetic and electrical, and miscellaneous property data of these same alloys one would need another 12 person years to complete this aspect. 

Table 1.11. Crystallographic phases of selected MOMs exhibiting magnetic order... 

Ni and Co are immiscible elements with Ag or Cu. Especially Ag is not miscible with Ni or Co even in liquid state. Therefore, there were no previous attempts to make Raney Ni or Co with dissolved Ag and no studies on their catalytic properties, ffere, we will show an approach to make Raney Ni or Co with Cu or Ag. In the case of Al-Co-Cu system precursor, MA was an effective process to prepare a supersaturated single solid solution as shown in Fig.9 (11). The crystallographic structure after leaching of this specimen showed a broad fee phase and no other phases were observed. To examine the as-leached state, the variation of magnetization was measured with the temperature (12). Figure 10 shows the result. The magnetization... 

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