Concentration Dependence of 127I NQR Spectrum Parameters for Mixed Layered Semiconductors (BiI3)1-x(PbI2)x
DOI:
https://doi.org/10.15407/ujpe56.2.158Keywords:
-Abstract
The results of our studies dealing with the NQR spectra of 127I in mixed layered semiconducting crystals (BiI3)1–x(PbI2)x measured
at a temperature of 77 K and in a wide range of PbI2 contents x (0 < x < 0.5) are reported. In the range 0.05 < x < 0.2; the observed behavior of 127I NQR spectrum parameters testifies that PbI2 atomic groups are located within the structural layers of a BiI3 crystal. In this x-range, clusters composed of PbI2 groups were demonstrated to form an island structure. A further growth of the PbI2 content results in the appearance of a new 127I NQR line which testifies that the mixed crystal (BiI3)1–x(PbI2)x undergoes a structural phase transition at x ≈ 0.2. A conclusion is made that, at x ≥ 0.2; the synthesized crystal is a glassy substitutional solid solution, in which PbI2 atomic groups, being completely or partially ordered, are intercalated between the BiI3 crystal layers.
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