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On the texture in diffusion‐grown layers of silicides and germanides with the FeB structure, Me X (Me=Ti, Zr; X =Si, Ge) or the ZrSi 2 structure (ZrSi 2 , HfSi 2 , ZrGe 2 )
Author(s) -
Maas J. H.,
Bastin G. F.,
Van Loo F. J. J.,
Metselaar R.
Publication year - 1984
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889884011079
Subject(s) - texture (cosmology) , orthorhombic crystal system , crystallite , crystallography , materials science , diffusion , crystal structure , chemistry , physics , thermodynamics , computer science , artificial intelligence , image (mathematics)
In diffusion‐grown layers of compounds with the orthorhombic FeB‐ and ZrSi 2 ‐type structures a pronounced texture is present which is rotationally symmetric with respect to the direction of diffusion. In FeB‐type structures a [101]‐fibre texture is observed for ZrSi and HfSi and a [100]‐fan texture for TiSi and ZrGe. In ZrSi 2 ‐type compounds the b axis is always perpendicular to the direction of diffusion; different compounds, however, show different textures: a [010]‐fan texture for ZrSi 2 , a [100]‐fibre texture for HfSi 2 and a 〈101〉‐fibre texture for ZrGe 2 . The textures are explained in terms of preferential diffusion along specific crystallographic directions which can be derived from the crystal structures. At high temperatures a second texture component has been observed in HfSi layers and in layers with the ZrSi 2 structure. This second component can be considered as a recrystallization texture and can be derived from the original texture by a rotation of the crystallites of 20–25° around a simple crystallographic direction. The existence of a so‐called TiGe phase with the FeB structure in the temperature region 1070–1270 K is questionable. Only Ti 6 Ge 5 has been produced and this compound showed a [001]‐fibre texture.