X-ray study of the component distribution in mould-grown Bi100-xSbx Crystals

✍ Scribed by Dr. H. Berger; Dr. G. Schneider

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 158 KB
• Volume: 19
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170190531

✦ Synopsis

X-ray Study of the Component Distribution in Mould-grown Biloo4Sb, Crystals

Morild growing (a modified version of Bridgnian technique) is a suitable niethod for growing crystals with given shape and orientation (CHAIKIN et al.). Usually the inonld-grown crystals are plates with a thickness of 1 to 2 mm, or have the shape of a disc, or rod, or triangle etc. This technique was also applied to alloy crystals in the system Biloo-.Sh, (HERRMANN et al.; SCIINEIDER et al.). Difficulties occur due to segregation, because the complete concentration profile of normal freezing is arranged inside the sample. I t is essential that the distribution of components depends on sample geometry. This follows already from the simple niodel assuming steady coniplete mixing of the melt (PFANN). Figure 1 shows that in a triangular saniple the length of the homogeneous first grown region is larger than in samples having the shape of a disc or a rod.