2026-10-14T23:39:37Z https://www.scidb.cn/oai

10.57760/sciencedb.43842 2026-07-30T11:10:47Z

2026-07-30 Controllable Residual Stress Modulation and Homogenization of Diamond through HPHT Annealing doi:10.57760/sciencedb.43842 en Science Data for “Controllable Residual Stress Modulation and Homogenization of Diamond through HPHT Annealing”. Diamond features superior optical, thermal and mechanical properties, yet dislocation-induced uneven residual stress severely impairs optoelectronic device performance. Meanwhile, controllable uniaxial stress is required for applications like terahertz generators, making precise stress regulation vital for diamond application. Current stress modulation techniques mainly generate limited inhomogeneous compressive stress via mechanical loading, lacking feasible approaches to introduce homogeneous uniaxial stress. Previous studies found that high-pressure and high-temperature (HPHT) annealing reshapes diamond stress distribution, but the dislocation slip mechanism lacks systematic investigation. This study aims to regulate the stress of diamond through HPHT annealing. By combining optical properties characterization, systematically analyzed evolutions of optical homogeneity, residual stress and point defects, with dislocation slip activation further interpreted by the Schmid critical resolved shear stress (CRSS) criterion. The results demonstrate that increasing annealing temperature optimizes stress distribution uniformity of (110) planes by reducing the Peierls barrier and CRSS to activate dominant {111}⟨110⟩ slip systems for dislocation glide. Dislocation-driven plastic deformation homogenizes native irregular residual stress on (110) surfaces and introduces extra uniform internal stress, while annealing at 2000 °C under 5 GPa for 120 minutes produces homogeneous residual stress over 1.5 GPa. This work offers a new route for stress engineering of high-performance diamond optics. High-pressure and high-temperature annealing; Dislocation slip; Stress engineering; Optical properties XJQ Shulong Zhang Chengchun Zhao Yin Hang RESTRICTED dataset Science Data Bank