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Structural and magnetic studies in the REPt5-xMx (RE=La, Nd ; M=Al, Ga, In) systems

Crystallographic and magnetic studies of the LaPt5-xMx and NdPt5-xMx (M=Al, Ga, In) systems have been carried out. It was found that platinum in LaPt5 and NdPt5 can be replaced by aluminium or gallium up to LaPt2Al3, LaPt2Ga3, NdPt2Al3 and NdPt2Ga3, respectively. However, substitution of indium for platinum was possible only in the system NdPt5-xInx and at the composition NdPt4In, but with a change to the cubic structure of the MgSnCu4 type. Magnetic measurements indicated that the Curie-Weiss bahaviour og NdPt5 is retained in all single phase ternary alloys. Generally the negative paramagnetic Curie temperature decrease and the effective magnetic moments increase as the content of the substituent increases. In the lanthanum containing systems the diamagnetism of LaPt5 changes to a weak paramagnetism when platinum is replaced by aluminium or gallium.

magnetic studies; aluminium; gallium; indium

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