Transmission electron microscopy study of Pb-depleted disks in PbTe-based alloys
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Author(s)
Wang, Hengzhi
Zhang, Qinyong
Yu, Bo
Wang, Hui
Liu, Weishu
Chen, Gang
Ren, Zhifeng
Date Issued
February 2011
Journal
Journal of Materials Research
Publisher
Cambridge University Press (Materials Research Society)
Citation
Wang, Hengzhi et al. “Transmission Electron Microscopy Study of Pb-depleted Disks in PbTe-based Alloys.” Journal of Materials Research 26.07 (2011): 912–916. © 2011 Cambridge University Press
Version
Final published version
Abstract
Even though the crystal structure of lead telluride (PbTe) has been extensively studied for many years, we discovered that the structure has a strong tendency to form Pb-depleted disks on {001} planes. These disks are around 2–5 nm in diameter and less than 0.5 nm in thickness, with a volume density of around 9 × 10[superscript 17] cm[superscript −3], resulting in lattice strain fields (3–20 nm) on both sides of the disks along their normal directions. Moreover, such disks were also observed in Pb-rich Pb[subscript 1.3]Te, Pb-deficient PbTe[subscript 1.3], and thallium (Tl)-doped Tl[subscript 0.01]Pb[subscript 0.99]Te and Tl[subscript 0.02]Pb[subscript 0.98]Te crystals. Because of the effects of diffraction contrast imaging by transmission electron microscopy and orientations of the crystals, these native lattice strain fields were incorrectly recognized as precipitates or nanoinclusions in PbTe-based materials. This discovery provides new insight into the formation mechanism of the precipitates or nanoinclusions in PbTe-based materials.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1557/jmr.2010.96
