1 / 49

Chapter 7

Chapter 7. Electrical properties. Typical values of electrical conductivity. Formation of polyacetylene and polyethylene. Polyparaphenylene and polypyrrole. TCNQ, TTF,…. Electrical resistance of YBa 2 Cu 3 O 7. Meissner effect showing repulsion of a superconductor. Levitation inaction.

imogene-blackwell
Download Presentation

Chapter 7

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 7 Electrical properties

  2. Typical values of electrical conductivity

  3. Formation of polyacetylene and polyethylene

  4. Polyparaphenylene and polypyrrole

  5. TCNQ, TTF,…

  6. Electrical resistance of YBa2Cu3O7

  7. Meissner effect showing repulsion of a superconductor

  8. Levitation inaction

  9. Type I and II superconductors

  10. Some superconducting materials

  11. Perovskite-related cuperate structures showing octahedral Cu+ YBa2Cu3O6 ABO3 A3B3O9-3 Cu2+ Y Ba BaTiO3 RbxWO3 Cu3+ YBa2Cu3O7 Cu2+ A3B3O9-2

  12. Perovskite-related cuperate structures showing square planar

  13. Cu+3, d8; Cu+2, d9; and Cu(I), d10s1

  14. Crystal structures of YBa2Cu3O7 andYBa2Cu3O6

  15. Tcvs oxygen content YBa2Cu3Od Oxygen loss on heating YBa2Cu3O7 Pressure of O2 in bars

  16. Tc as a function of lattice parameter for K3C60 The interaction of C603- anions determines conductivity. more metallic less metallic

  17. Conductivity of metals, semiconductors and insulators

  18. Relation between electronic properties and magnitude of the band gap

  19. p-type semiconductivity in gallium-doped silicon

  20. n-type semiconductivity in arsenic-doped silicon

  21. A pn junction

  22. Migration of cation vacancies

  23. Schematic ionic conductivity of doped NaCl crystal s = nem0exp(-Em/RT) n = N exp(-Ef/2RT) Na1-2xMnxVxCl Low temp High temp Em = activation energy of cation migration Ef = activation energy to form Schottky defects

  24. Pathway for Na+ migration in NaCl

  25. Triangular interstice

  26. Ionic conductivity of pure NaCl as a function of temperature

  27. Conductivity in NaCl crystals

  28. Migration of interstitial Ag+ ions by direct interstitial jump and indirect interstitialcy mechanism

  29. Effect of Cd+2 on conductivity of AgCl crystals This indicates more than one mechanisms for conductivity. s depends on [Agi+] Addition of Cd2+ decreases [Agi+] first, then increase [VAg].

  30. Solid electrolytes as intermediate between normal crystalline solids and liquids

  31. Ionic conductivity of some solid electrolytes LT HT

  32. Oxide layers in -alumina

  33. Oxide packing in - and ’’-alumina

  34. Conduction plane in -alumina

  35. An example of F- anionic conductor Conductivity of PbF2

  36. Some oxide ion conductors

  37. Electrochemical cell containing a solid electrolyte

  38. Components of a secondary lithium battery

  39. A thin film electrochromic device

  40. Oxygen concentration cell

  41. Dielectric material between two plates of a parallel plate capacitor

  42. Hysteresis loop of a ferroelectric

  43. Some ferroelectric materials

  44. Spontaneous polarization of a TiO6 octahedron in BaTiO3

  45. Dipole orientation in a ferroelectric, an antiferroelectric, and a ferrielectric

  46. Ferroelectric domains separated by a domain wall or boundary

  47. Dielectric constant for barium titanate ceramic e‘= C/(T-q) Curie-Weiss Law antiferroelectric paraelectric

  48. Antiferroelectric-ferroelectric transition in PbZrO3 as a function of applied field ferroelectric antiferroelectric

  49. Displacement of phosphorus within a PO2(OH)2

More Related