Application of the photoacoustic method for characterization of natural galena (PbS)

P. M. Nikolić, S. Crossed D signurić, D. M. Todorović, D. Vasiljević-Radović, V. Blagojević, P. Mihajlović, J. Elazar, K. T. Radulović, A. I. Bojičić, D. Urošević

Research output: Contribution to journalArticlepeer-review

Abstract

Electron transport properties of single crystal and polycrystalline natural mineral galena (PbS) samples from the Trepča mine, Yugoslavia, were determined using the photoacoustic frequency transmission technique. Their thermal diffusivity (DT ≈ 0.16 × 10-5 m2 s-1), the coefficient of diffusion (D between 0.15 × 10-2 0.16 × 10-2 m2 s-1) and lifetime of the excess carrier (τ ≈ 35 μs and the front and rear recombination velocity (Sg ≈ 65.5 m s-1 and Sb ≈ 66.4 m s-1, respectively), were calculated by comparing the experimental results and the theoretical photoacoustic amplitude and phase signals. The lattice parameter obtained by X-ray work was a = 5.936 Å. The free carrier concentration of these single-crystal samples was measured using the Hall method (N = 3 × 1018 cm-3). Measurements of the optical reflectivity of the same samples, as a function of wavelength, in the infrared and far infrared ranges, were performed. In the far infrared range a free electron plasma frequency was observed and numerically analyzed, using the least-squares fitting procedure. The values of optical parameters were calculated and the value of the free carrier concentration obtained by the Hall method was confirmed.

Original languageEnglish
Pages (from-to)44-51
Number of pages8
JournalPhysics and Chemistry of Minerals
Volume28
Issue number1
DOIs
StatePublished - 6 Aug 2001
Externally publishedYes

Keywords

  • Electron transport properties
  • Natural galena
  • Optical properties
  • Photoacoustic method
  • Thermal diffusivity

ASJC Scopus subject areas

  • General Materials Science
  • Geochemistry and Petrology

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