Dielectric Spectroscopy and Dielectric Permittivity Physical Nature

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AACIMP 2011 Summer School. Science of Global Challenges stream. Lecture by Yuriy Poplavko.

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Dielectric Spectroscopy and Dielectric Permittivity Physical Nature

  1. 1. D ielectric Spectroscopy and Dielectric Permittivity Physical Nature Y. M. Poplavko National Technical University of Ukraine, 37, Peremogi Ave., Kiev - 03056, Ukraine
  2. 2. Introduction <ul><li>40 years of Dielectric Spectroscopy </li></ul><ul><li>Dielectric Spectroscopy enables to distinguish experimentally different polarization mechanisms. </li></ul><ul><li>Dielectric Spectroscopy studied fast and slow polarization mechanisms </li></ul>
  3. 3. Historical excursus: 40 years of Dielectric Spectroscopy <ul><li>Y.M.Poplavko, V.G.Tsikalov, et al. Dielectric spectrum of lithium niobate crystal. Physika Tverdogo Tela, 1973, Vol.15, No 5, p.1443. </li></ul><ul><li>Y.M.Poplavko, L.P.Pereverzeva et.al. Dielectric spectrum of TGS crystals. Physika Tverdogo Tela, 1973, Vol.15, No 4, p.1250. </li></ul><ul><li>Y.M.Poplavko, L.P.Pereverzeva et al. Dielectric spectrum of KDP type crystals. Kristallographija, 1973, Vol.18, No3, p.645. </li></ul><ul><li>Y.M.Poplavko et al. Rochelle salt dielectric spectrum at 1 Hz – 300 GHz. Phys. Tverdogo Tela, 1973, Vol.15, No8, p.2515. </li></ul>
  4. 4. Dielectric permittivity nature
  5. 5. Dielectric Spectroscopy methods <ul><ul><li>Microwave Dielectric Spectroscopy method is used: </li></ul></ul><ul><ul><li>- in the frequency range of 0.1 – 100 GHz </li></ul></ul><ul><ul><li>- in broad temperature interval of 80 – 800 K </li></ul></ul><ul><ul><li>- a family of  *(  ,T) =  '(  ,T) + i  &quot;(  ,T) curves are obtained. </li></ul></ul><ul><ul><li>- spectra of order-disorder type ferroelectrics; </li></ul></ul><ul><ul><li>- spectra of displace ferroelectric </li></ul></ul><ul><ul><li>- spectra of solid solutions with the diffused phase transition </li></ul></ul>
  6. 6. Examples of dielectric spectra
  7. 7. KDP crystal spectrum
  8. 8. BaTiO3 crystal spectrum
  9. 9. Electromechanical mechanism Piezoelectric influence on KDP  eff =  X Piezoelectric influence on Salt and Rochelle
  10. 10. Typical dielectric spectrum for order–disorder ferroelectrics
  11. 11. Typical dielectric spectrum for displacive ferroelectrics
  12. 12. Typical dielectric spectrum for relaxor ferroelectrics
  13. 13. Relaxor ferroelectric PMN = PbMg1/3Nb2/3O3
  14. 14. Microwave methods for ferroelectrics study
  15. 15. Measurement scheme: a ) short-circuit line method, b ) transmission/reflection method
  16. 16. Measured data and processing for TiO2,  = 96
  17. 17. Measured data and processing for 3.89 mm SrTiO3, transmission experiment
  18. 18. Microwave methods for ferroelectric films study
  19. 19. Schematic representation of film study experiment
  20. 20. Measured data and calculation for ) 0.84   m BST film on 0.5 mm thickness MgO substrate.
  21. 21. Coplanar line measurement cell
  22. 22. Measured and calculated frequency dependence of scattering matrix parameter S21
  23. 23. Thank you for kind attention!

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