Bi_2(Te_(1-x)Se_x)_3单晶生长热力学研究

A Study on the Thermodynamics of Bi_2(Te_(1-x)Se_x )_3 Single Crystal Growth

本工作研究了Bi－Fe－Se三元相在富Bi2Te3区的相图。测定了Bi2Te3和Bi2Se3从550℃到它们的熔点范围内的等浓度线，用移动加热器（THM）法生长Bi2（Te1-xSex）3（x＝0.025和x＝0.05）。用霍尔（Hall）效应测定这些化合物在富Te区的固线，研究表明，可再生法生长热力学定义的单晶是可能的.

This work studied the Bi-Te-de ternary phase diagram on the Bi2Te3-rich side and with excess tellurium. The isoconcentrationlines for Bi2Te3 and Bi2Se3 have been betermined at temperatures ranging from 550℃ to their metting points. Bi2(Te1-x Sex )3 single crystalsolid solutions with x = 0.025 and x = 0. 05 have been grown using the travelling hester method. The solidus on the Te-rich side for thesecompositions has been determined by Hall effect measurements. This study shows that it is possible to grow thermodynamically well-defined single crystals in a reproducible way.