Microstructure refinement approaches of melt-grown Al2O3/YAG/ZrO2 eutectic bulk

Orientations and seed type effect on Al2O3-YAG-ZrO2 eutectic microstructure solidified from the melt by the micro-pulling down technique

“…It is based on the competitive growth kinetic in which leading phase is the one that is growing at higher interface temperature. The formation of colonies has been shown to occur due to the presence of nonplanar eutectic growth interface [31,32,33]. As shown in figure 4, the solidified eutectic using eutectic seed under the same conditions presents a slight magnification of the phases.…”

Cr-doped Al2O3–YAG binary and Al2O3–YAG–ZrO2 ternary eutectic materials crystallized by the micro pulling down technique and their characterization

“…Cr 3+ gives rise to many colors; it is mainly found in octahedral geometry in minerals and is notably not only responsible for the green color of the emerald and red color of ruby but can also give purple as in stichtite. 23,24 The presence of Cr 3+ in a more or less distorted octahedral geometry results in the presence of two main absorption bands in the visible range of its optical spectrum. The observed energy shifts of the absorption bands of Cr 3+ between the different minerals explain different colorations since the transmission window in the visible range is modified with these displacements.…”

“…Cr 3+ gives rise to many colors; it is mainly found in octahedral geometry in minerals and is notably not only responsible for the green color of the emerald and red color of ruby but can also give purple as in stichtite. 23,24 The presence of Cr 3+ in a more or less distorted octahedral geometry results in the presence of two main absorption bands in the visible range of its optical spectrum.…”

The impact of the composition and solidification rate on the microstructure and the crystallographic orientations of Al2O3–YAG–ZrO2 eutectic solidified by the micro-pulling down technique

“…Depending on the pulling rate conditions, the microstructure will also undergo transitions linked to the destabilization of the interface. 49,51,52 Despite the different studies, experimental data for the directional solidication of oxide eutectics (processing difficulties, microstructure instabilities) are still limited and oen uncertain. A systematic study of the microstructure is strongly needed before eutectic ceramic oxides can be fully developed for application.…”