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In this work the results of the investigation of the $\mathrm{<mrow\; data-mjx-texclass="ORD">127</mrow>}$I NQR spectra at 77K for mixed layered semiconductor crystals (PbI$2$) (BiI$3$) in a wide range of value (0 \textless x \textless 0.50) are presented. It is shown that in the range 0.05 \textless x \textless 0.20 of admixture PbI$2$ the observed behavior of parameters of the $\mathrm{<mrow\; data-mjx-texclass="ORD">127</mrow>}$I NQR spectra testify about entrance of admixture atoms PbI$2$ into the crystal layers. It is shown, that at 0.05 \textlessÊ x \textless 0.20 clusters from groups of atoms PbI$2$ insular type can be formed, which lay within the limits of the layers of crystal (PbI$2$) (BiI$3$). Upon further increasing of the containing of admixture PbI$2$ in crystal BiI$3$ the "new" $\mathrm{<mrow\; data-mjx-texclass="ORD">127</mrow>}$I NQR line is appearing. The observed at x $~$ 0.20 the new line in spectrum $\mathrm{<mrow\; data-mjx-texclass="ORD">127</mrow>}$I NQR can testify that the mixed crystal (PbI$2$) (BiI$3$) undergoes structural phase transition. It is concluded that at x\textgreater 0.20 a new crystal presents a solid mixture glassy crystal of substitution type in which of PbI$2$ atoms are fully or partially are ordering and lay between crystal .