THE FORMATION OF Z-PHASE SM(FE,TI)(8.5)

The high-temperature modification Sm-2(Fe,Ti)(17) of Th2Ni17 type was found to exist in the Sm(Fe1-xTix)(y) alloy system (0.04 less than or equal to x less than or equal to 0.07 and 8.0 less than or equal to y less than or equal to 9.0) at T greater than or equal to 1250 degrees C. More low-temperature phases Sm(Fe,Ti)(12) and Sm-2(Fe,Ti)(17) of Th 2Zn17 type form from this modification. A ternary Sm(Fe0.935Ti0.0658.5 , compound analogous to the Z-phase Sm(Fe0.91V0.09)(8.5) is obtained i n the interval 1150-1250 degrees C. It can be considered to have a new type of a superstructure based on the CaCu5-type structure with a mon oclinic unit cell having parameters a=0.972 nm, b=0.856 nm, c=1.063 nm , beta=96 degrees 50'.