Phase transformation and conductivity in nanocrystal PbS under pressure

Jianzhong Jiang, Leif Gerward, R. Secco, D. Frost, J. S. Olsen, J. Truckenbrodt

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Abstract

The grain-size effect on the phase transition induced by pressure in PbS was studied by in situ high-pressure electrical resistance and synchrotron radiation x-ray powder diffraction measurements. The mean transition pressure of the B1-to-B16 phase transformation was found to be 6.3±1.3 GPa in 8±1 nm PbS while it is 3.1±0.7 GPa for 10 µm PbS. The resistivity of the B16 PbS phase decreases exponentially with pressure in both samples at ambient temperature. They follow R[proportional]exp(–CP), where C = –0.64 GPa–1 for 10 µm PbS and C = –0.34 GPa–1 for 8±1 nm PbS. These results are discussed in terms of a decrease of energy band gap with increasing pressure. ©2000 American Institute of Physics.
Original languageEnglish
JournalJournal of Applied Physics
Volume87
Issue number5
Pages (from-to)2658-2660
ISSN0021-8979
DOIs
Publication statusPublished - 2000

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Copyright (2000) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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