Download presentation
Presentation is loading. Please wait.
Published byAubrie McGee Modified over 9 years ago
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 YBa 2 Cu 3 O 7
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 YBa 2 Cu 3 O 6 YBa 2 Cu 3 O 7 BaTiO 3 Rb x WO 3 ABO 3 A 3 B 3 O 9-2 A 3 B 3 O 9-3 Cu 2+ Cu + Cu 2+ Cu 3+ Y Ba
12
Perovskite-related cuperate structures showing square planar
13
Cu +3, d 8 ; Cu +2, d 9 ; and Cu(I), d 10 s 1
14
Crystal structures of YBa 2 Cu 3 O 7 and YBa 2 Cu 3 O 6
15
T c vs oxygen content YBa 2 Cu 3 O YBa 2 Cu 3 O Pressure of O 2 in bars Oxygen loss on heating
16
T c as a function of lattice parameter for K 3 C 60 more metallicless metallic The interaction of C 60 3- anions determines conductivity.
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 E m = activation energy of cation migration E f = activation energy to form Schottky defects = ne 0 exp(-E m /RT) n = N exp(-E f /2RT) Low temp High temp Na 1-2x Mn x V x Cl
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 depends on [Ag i + ] Addition of Cd 2+ decreases [Ag i + ] first, then increase [V Ag ]. This indicates more than one mechanisms for conductivity.
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
Conductivity of PbF 2 An example of F - anionic conductor
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 TiO 6 octahedron in BaTiO 3
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 paraelectricantiferroelectric ‘= C/(T- ) Curie-Weiss Law
48
Antiferroelectric-ferroelectric transition in PbZrO 3 as a function of applied field antiferroelectric ferroelectric
49
Displacement of phosphorus within a PO 2 (OH) 2
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.