A simple sonochemical hydrolysis was used to synthesize dysprosium (Dy) doped titania (TiO₂) nanopowder. The microstructure results have been confirmed the amorphous structure with high roughness-surface morphology of the undoped TiO₂ sample. Whereas, Dy-doped TiO₂ samples are in anatase phase with small crystallite size ~5.5 nm. The optical energy gap exhibited close variations with Dy content that is referring to the stability of the inner structure of the basic anatase unit cell. The amorphous pure and crystalline doped samples are exhibited high value of NIR reflectance ($R_{NIR}^{\ast }$) with percentage varied from 88.14 to 66.61%. Such high values of $R_{NIR}^{\ast }$ could be attributed to high roughness-surface morphology and the small particle size of the investigated samples, respectively. Moreover, the doped sample with the low content of Dy was gotten the lowest value of the reflectance in visible light range ($R_{VIS}^{\ast }$) that referred to its ability to reduce the glare of the reflected sunlight in such range.

简单的声化学水解用于合成（Dy）掺杂的二氧化钛（TiO ₂）纳米粉。微观结构结果已经证实了未掺杂的TiO ₂样品具有高粗糙度-表面形态的非晶结构。然而，Dy掺杂的TiO ₂样品处于锐钛矿相，微晶尺寸较小，约为5.5 nm。光学能隙表现出随Dy含量的紧密变化，Dy含量指的是基本锐钛矿基本单元的内部结构的稳定性。非晶态纯净和晶体掺杂的样品显示出很高的近红外反射率值（${\mathrm{[R}}_{ñ\mathrm{一世}\mathrm{[R}}^{\ast }$）的百分比从88.14到66.61％不等。如此高的价值${\mathrm{[R}}_{ñ\mathrm{一世}\mathrm{[R}}^{\ast }$可以分别归因于所研究样品的高粗糙度表面形态和小粒径。此外，Dy含量低的掺杂样品在可见光范围内的反射率值最低（${\mathrm{[R}}_{V\mathrm{一世}\mathrm{小号}}^{\ast }$）指其在此范围内减少反射阳光的眩光的能力。