Rietveld refinement of the A3B (D019) and A2B (B82) phases in Ti-Sn and Ti-Ga alloys

被引：7

作者：

Banumathy, S. ^{[1
]}

Singh, A. K. ^{[1
]}

机构：

[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

来源：

INTERMETALLICS | 2011年 / 19卷 / 10期

关键词：

Phase transformations; Site occupancy; X-ray diffraction;

D O I：

10.1016/j.intermet.2011.06.004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structures of A(3)B (D0(19)) and A(2)B (B8(2)) phases have been investigated using Rietveld refinement of XRD data. The analyzed chemistry of individual phases has been used to determine the site occupancy of initial models. The shifts in Ti atoms corresponding to 6(h) Wyckoff positions have been calculated in both the Ti3Sn and Ti3Ga phases. This is related to the presence of symmetry elements in D0(19) structure which in turn allows local shift due to different site occupancies resulting in different potentials. The nature of atomic shift is opposite in Ti3Sn and Ti3Ga phases. The site occupancy patterns of A(3)B (Ti3Sn, Ti3Ga) and A(2)B (Ti2Sn and Ti2Ga) are different due to unlike chemical compositions. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1594 / 1598

页数：5

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