The temperature dependence of the crystal structure of Potassium Hexaiodoplatinate(IV) between 80 and 500 K is described. Below 410 K, K₂PtI₆ adopts a monoclinic structure described in space group P2₁/n due to the presence of tilting of the PtI₆ octahedra. Heating the sample to above 410 K results in the loss of the out-of-phase tilts and a transition to the previously described tetragonal structure in space group P4/mnc. The remaining in-phase tilts are lost upon heating to above 460 K where the structure is cubic in space group $Fm\bar{3}m$.

It is anticipated that the identification of accurate structures for the three polymorphs of K₂PtI₆ will stimulate further theoretical and practical studies.

描述了 80 至 500 K 范围内六碘铂酸钾 (IV) 晶体结构的温度依赖性。在410K以下，由于PtI _{6八面体倾斜的存在，K 2} PtI _{6采用空间群}P 2 ₁ / n中描述的单斜结构。将样品加热至 410 K 以上会导致异相倾斜消失，并转变为空间群P 4/ mnc中先前描述的四方结构。加热到 460 K 以上时，剩余的同相倾斜就会消失，此时结构在空间群中呈立方体$F米\bar{3}米$。

预计K ₂ PtI ₆的三种多晶型物的准确结构的鉴定将促进进一步的理论和实践研究。