CONCENTRATION-DEPENDENCE OF THE MAGNETIC-PROPERTIES OF MELT-QUENCHED P-TYPE MG30GDXZN70-X QUASI-CRYSTALS

Mg30GdxZn70-x(x=7, 8, 9 and 10) quasicrystals have been prepared in or der to investigate their crystal structure and magnetic properties. Th e quasicrystal structure has been identified as a P-type with a Frank- Kasper-type structure, The temperature dependence of DC magnetic susce ptibility follows Curie-Weiss law. The Gd-Gd exchange interaction is p redominantly antiferromagnetic for all quasicrystals since their param agnetic Curie temperature is negative. The magnitude of theta(p) , inc reases with the increase in the Gd content and the saturation of high- field magnetization curves becomes easier with decreasing Gd content. In these alleys, the spin-glass state appears and the spin freezing te mperature T-f increases with increasing Gd content. The value of T-f f or the P-type Mg30Gd8Zn62 quasicrystal is comparable to that for an F- type Mg42Gd8Zn50 quasicrystal.