Elxtron and L-n) difhction parrems uers [&en from four different N I , -~R~ alloys. uith x = 0 25.0.35.0 ?J and 0 SO. to Lnaehma thc cxtslcnw and shape of the diffuru tntens~ty. which gwes us mformamn about rtructurd Ruciu3iions A p ? d w rhapc of dlHuse scxtenq has o c m obsmcd at I O 0 md I IO ma their cquirdent posmons in the pmncms. thc shap of the uiffusr. mtcnsir> at [he IO0 position chvlgins sith PI content In the all0)s. The shape of the diffue mehit) at the 100 position ior th: I = 0 25 allo) IS rod.lAe. but thc shape 1s ncxly sphmcil for the I = 0 50 dlo) Thi \.raj diffuse scetenng intensities urn mezurcd from the I = 0.50 s m z l c -q s d allo) at room tempmure. m d the Wmen-Coulq shon-rmgc order p x m e t e n neIe determned aft<, mi.),mg thr. dan Thc corrc.mon length has been deduced to be aboJt 19 A from <,ttmang the i n r e r~e of In< full width at hall-mumum of the diffuse peak
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