关键词: Tb2Fe17;Tb2(Fe,Si)17;提拉法单晶生长;相图;磁性测量

Abstract: Single crystals of rare-earth intermetallic compound of Tb2Fe17 and Tb2(Fe,Si)17 have been grown by CZ method with cold crucible.The phase diagram around Tb2Fe17 has been investigated by various examination methods.It has been found that the phase relation on Tb2Fe17 is not the peritectic,as reported in previous works.A new phase diagram on this compound has been given based on the experimental results,which indicates that the real phase relation on this compound is congruent solidification.This phase relation provides a good intrinsic condition for growing high quality crystal.The X-ray diffraction reveals that the structure of Tb2(Fe,Si)17 become a mixture of Th2Ni17 and Th2Zn17,when the x value is larger than 3.0.The magnetization and the first order magnetization process(FOMP)of the single crystalline samples have been measured,The results indicate that the high quality crystals could be grown from the starting material with stoichiometric composition.Therefore,the magnetic measurement used in the present work will be an effective method for determining the quality of grown single crystals.