The thermodynamic properties of UFe 2 :Agreement with the campbell correlation of laves phase compounds
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The Thermodynamic Properties of UFe2: Agreement with the Campbell Correlation of Laves Phase Compounds
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T h e r e p o r t e d v a l u e of t h e h e a t of f o r m a t i o n of U F e 2 d e t e r m i n e d by acid solution c a l o r i m e t r y ~ and the G i b b s e n e r g y of f o r m a t i o n d e t e r m i n e d by h i g h t e m p e r a t u r e e m f c e l l s z s e e m to g i v e r e s u l t s t h a t a r e in u n r e a s o n a b l y p o o r a g r e e m e n t . It w a s r e c e n t l y d i s covered 3 that a well defined correlation exists bet w e e n the h e a t of f o r m a t i o n and the u n a l l o y e d r a d i u s r a t i o of ABe t y p e L a v e s c o m p o u n d s . W h e n t h i s t e s t i s a p p l i e d it i s f o u n d t h a t t h e e m f d a t a of Y o s h i h a r a a n d K a u n o f o r UFe2 g i v e s v e r y g o o d c o r r e l a t i o n w i t h the compounds f o r m e d b e t w e e n Pu and the Group V I I I a m e t a l s a s s h o w n i n F i g . 1. A l t h o u g h t h e s e a u t h o r s d i d n o t i n d i c a t e t h a t h e a t s o r e n t r o p i e s of formation could be calculated fromtheir data, a t h i r d law c a l c u l a t i o n u s i n g K o p p ' s law of the a d d i t i v i t y of h e a t c a p a c i t y 4 s h o w s t h a t t h e e n t r o p y t e r m d e r i v e d f r o m t h e o b s e r v e d G i b b s e n e r g y of f o r m a t i o n
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