Portal de Periódicos da CAPES

Texture formation and element partitioning in trapiche ruby

1999; Elsevier BV; Volume: 206; Issue: 4 Linguagem: Inglês

10.1016/s0022-0248(99)00331-0

1873-5002

Ichiro Sunagawa, Heinz-Jürgen Bernhardt, Karl Schmetzer,

Metallic Glasses and Amorphous Alloys

Based on textural and compositional investigations on ruby single crystals showing textures with six arms and six growth sectors (trapiche ruby), it has been analysed how the unique texture was formed, and the element partitioning was governed by the growth mechanism. The arms were formed earlier by dendritic growth on rough interfaces, and the growth sectors by lateral growth on smooth interfaces. The arm portions consist of plural mineral phases but show a low and almost uniform Cr content in corundum throughout the extension of the arm and its branches, whereas the growth sectors are single ruby phase, but show Cr zoning parallel to the growth surfaces. Element partitioning in the earlier dendritic growth is governed by thermodynamic parameters, whereas that of the latter layer-by-layer growth by kinetics.