缺陷闪锌矿晶体Hg_3In_2Te_6孪晶的EBSD和HRTEM观察

EBSD and HRTEM observations on the twins in Hg_3In_2Te_6 crystals with defect zinc-blende structure

通过电子背散射衍射(EBSD)和高分辨透射电子显微术(HRTEM)对缺陷闪锌矿晶体Hg3In2Te6(MIT)中的孪晶进行观察。实验发现,大多数基体的应变能比孪晶小,且一些带状孪晶的所有孪晶界均不共格。此外,高密度结构空位的存在并未改变孪生面和孪生方向。上述结果可按照变形孪晶,并考虑高密度结构空位团簇的影响来解释。HRTEM观察显示孪晶界上存在着台阶和孪生位错,符合变形孪晶的特征。

Electron backscattered diffraction (EBSD ) and high-resolution transmission electron microscopy (HRTEM)are used to study the twins in Hg3 In2 Te6 (MIT)crystals with defect zinc-blende structure.The re-sults show that strain energy of the maj ority of matrices was smaller than that of their corresponding twins.All twin boundaries of some band-like twins are incoherent.In addition,the existence of high-density structural va-cancies do not change the twinning plane and the twinning direction.The above results can be explained by de-formation twins with the consideration on the influence of high-density structural vacancy clusters.HRTEM observation shows that steps and twinning dislocations exist at the twin boundaries,which are consistent with deformation twins.