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The crystal structures of several intermetallie compounds of thorium with palladium and platinum have been reported recently, that of Th2Pd(C16 ) by Ferro (1961), of ThPda(DO2a) by Dwight (1961), and of ThPd4(LI2) by Thomson (1962a); the structures of Th~Pts(D102) and ThPt(Bf) were given by Thomson (1961Thomson ( , 1962b. The crystal structures of the compounds Th3Pd 5 and ThsP % are described in the present paper.The alloys were prepared by arc-melting the component metals into l-gram buttons in a zirconium-gettered argon atmosphere. As the alloys were brittle, powders for X-ray studies were prepared by crushing in air and gave very sharp X-ray patterns without a strain-relieving anneal. Powder patterns were obtained with a Guinier-type focusing camera using copper radiation and a quartz monochromator (~Ka1= 1.54050 ~) and the line intensities were estimated visually.

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