Abstract

Laser heating of chalcogenide glasses has successfully produced rotating lattice single crystals through a solid-solid transformation. To better understand the nature of complex, orientation-dependent lattice rotation, we designed heat profiles of the continuous wave laser by beam shaping, fabricated larger Sb2S3 crystal dots in Sb2S3 glass, and investigated the lattice rotation where the crystal could grow in all radial directions under a circular thermal gradient. The results show that the rate of lattice rotation is highly anisotropic and depends on crystallographic direction. The nature of this rotation is the same in crystals of different orientation relative to the surface. The growth directions that align with the slip planes show the highest rate of rotation and the rotation rate gradually decreases away from this direction. Additionally, the presence of multiple growth directions results in a complicated rotation system. We suggest that the growth front influences the density of dislocations introduced during growth under confinement and thus affects the lattice rotation rate in these crystals.

Highlights

  • It was found that when multiple 1D crystal lines are grown from a single seed, the lines display different rates of lattice rotation; these results suggest that the crystal seed orientation with respect to the growth direction may have an influence on the lattice rotation process [5]

  • The inverse pole figure (IPF) displays a rather uniform purple color of the pixels indicating that a single crystal grain of Sb2 S3 was produced

  • In this work we have demonstrated a successful beam-shaping strategy for fabricating relatively large single crystal dots using a spatial light modulator

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Summary

Introduction

The results show that the rate of lattice rotation is highly anisotropic and depends on crystallographic direction The nature of this rotation is the same in crystals of different orientation relative to the surface. An amorphous phase can be directly converted into a single crystal by the solid-solid transformation via space selective laser heating of glass [4] Such crystallization via laser heating is a fundamentally different process than classic processes such as Czochralski, Bridgman, and float-zone techniques in which a crystal is grown from a seed by cooling a melt. Electron back scatter diffraction (EBSD) mapping indicates that the crystal grows macroscopically, while the crystal lattice simultaneously rotates gradually about an axis that is parallel to the glass surface and normal to growth direction [5]. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations

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