Crystal Structure of ZnxCd1-xS Nanocrystals Obtained by Self-Propagating High-Temperature Synthesis

Authors А.V. Kovalenko, Ye.G. Plakhtii , О.V. Khmelenko

Oles Honchar Dnipro National University, 72, Gagarin Ave., 49010 Dnipro, Ukraine

Issue Volume 14, Year 2022, Number 1
Dates Received 12 April 2021; revised manuscript received 23 February 2022; published online 28 February 2022
Citation А.V. Kovalenko, Ye.G. Plakhtii, О.V. Khmelenko, J. Nano- Electron. Phys. 14 No 1, 01017 (2022)
PACS Number(s) 81.20.Ka, 76.30. – v, 61.05.cp
Keywords ZnxCd1-xS nanocrystals, Zinc sulfide, Cadmium sulfide, Self-propagating high-temperature synthesis, X-ray diffraction analysis, EPR spectra, Crystal structure (8) .

ZnxCd1-xS nanocrystals were obtained by self-propagating high-temperature synthesis. The synthesis was carried out in an air environment at atmospheric pressure. We managed to synthesize nanocrystals close to CdS (0 ≤ x < 0.2), as well as close to ZnS (0.8 ≤ x ≤ 1) by changing the ratio between Zn and Cd from 0 to 1 with a step of 0.1 in a real product. Their sizes were determined by the Scherrer method and were in the range of 40÷60 ± 5 nm. ZnxCd1-xS nanocrystals of all compositions were characterized by a mixed crystal structure; the maximum proportion of the cubic phase was typical of compositions close to ZnS, and the minimum one – of compositions close to CdS. The degrees of microdeformations of the crystal lattice of ZnxCd1-xS nanocrystals were within 1.05∙104÷3.97∙103; dislocation densities were determined within 7.91∙1010÷3.1∙1011. Based on the analysis of the EPR spectra, it was shown that when the local environment of Mn2+ ions changed with increasing parameter x, the constant of the EPR hyperfine structure of Mn2+ ions explosively decreased from the value А  7.00÷7.06 mТ to the value А  6.84 mТ. The presence of the EPR line of Cr+ ions in unlit ZnS and Zn0.8Cd0.2S nanocrystals may indirectly indicate n-type conductivity of the samples obtained.

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