Directional solidification and characterization of Hg0.89Mn0.11Te

Analysis of radial segregation in directionally solidified Hg0.89Mn0.11Te

“…Since no single analytical technique was suitable to analyze all sample shapes and thicknesses, the first method used to ensure the comparability of results from all growth experiments was to compare the compositional information obtained from the different analytical techniques employed in the study of MMT by the authors. Thus, the results obtained from FTIR and WDS compositional analyses in this study were compared to the results of the precision density analysis and 1D diffusion model calculations reported previously [14]. Average composition values for radial slices were obtained by averaging the composition values from individual points analyzed using FTIR or WDS on a single slice.…”

“…Price et al [14] have shown previously that the axial composition profile of MMT-1 and MMT-3 under the applied growth conditions can be described by a 1D diffusion model that assumes no convection in the melt. However, several theoretical and experimental investigations [6][7][8][9][10] of II-VI alloy systems support a conclusion that convection must be present during the directional solidification of alloys such as MMT.…”

“…Compositional analysis was performed on each section by one or more of the following techniques: precision density, (FTIR), or (WDS) electron microprobe quantitative analysis. The results of the precision density analysis were described previously by the authors [14]. Sections removed from boules for precision density analysis are not shown in Fig.…”

“…1. FTIR analysis was performed by the methods described by Szofran et al [15] and Price et al [14] on radial and axial sections cut and then polished to a thickness o0.5 mm. The FTIR spectrometer used to perform the analysis was a Perkin-Elmer Spectrum 2000 with an i-series microscope attachment.…”

“…At each gridpoint, the FTIR spectrum was used to determine the bandgap of the material ( Fig. 2(b)) and its composition according to the method described previously by the authors [16]. Fig.…”