Magnetic phase diagram of CexLa1-xSb alloys for x=0.9 and 0.5

We have investigated the magnetic properties of CexLa1-xSb alloys for x = 0 .9 and 0.5 by means of magnetization and specific heat measurements. They e xhibit the magnetic ordering below 11.4 K for x = 0.9 and 1.5 K for x = 0.5 . Their distinct anomalies have been observed at the phase boundaries in ma gnetic fields. Transformations in the magnetic field-temperature phase diag rams of these alloys have been established. The features of these phase dia gram seem that all magnetic phases shift towards low temperature as the La concentration increases. The magnetic property of Ce0.5La0.5Sb is mostly ex plained by the crystalline electric field (CEF) effect. It is shown that th e p-f mixing effect in CexLa1-xSb becomes weaker and CEF effect consequentl y becomes dominated in Ce-LaSb alloy with increasing the La substitution.