Linker IT Software
Google
Web www.oraxcel.com
menubar-top-links menubar-top-rechts
Home Help Search Login
Welcome, Guest. Please Login.
SQL*XL: Database to Excel bridge litLIB: Excel power functions pack ExcelLock: Locking and securing your valuable Excel spreadsheets encOffice: Protect your Excel file easy and safe encOffice: Protect your Excel file easy and safe
Pages: 1
Dielelctric constant (Read 3485 times)
Gerrit-Jan Linker
YaBB Administrator
*****




Posts: 75
Dielelctric constant
04.06.08 at 17:07:59
 
Dielelctric constant
 
The dielectric constant is a property of a bulk material (bulk is at lease dimensions of 100x100x100 Angstrom), not an individual molecule. It arises from the polarity of molecules (static dipole moment), and the polarizability and orientation of molecules in the bulk medium.
 
The standard term is Relative Static Permttivity. Besides dielectric constant, other terms for the relative static permittivity are relative dielectric constant, or static dielectric constant.  
 
The relative static permittivity of a material is a measure of the extent to which it concentrates electrostatic lines of flux.  
 
It is the ratio of the amount of stored electrical energy when a potential is applied, relative to the permittivity of a vacuum.  
 
The relative static permittivity is the same as the relative permittivity evaluated for a frequency of zero.
 
Static dielectric constant: low frequency - molecule has chance to relax in the applied field.
Optical dielectric constant: high frequency - molecule does not relax in the applied field.
 
See also:
Dielectric, Electric susceptibility
http://www.oraxcel.com/cgi-bin/yabb2/YaBB.pl?num=1282636975/0#0
Permittivity
http://www.oraxcel.com/cgi-bin/yabb2/YaBB.pl?num=1282637587/0#0
 
Source:
Dielectric constant - Wikipedia
http://en.wikipedia.org/wiki/Dielectric_constant
Back to top
 
« Last Edit: 04.07.15 at 21:30:10 by Gerrit-Jan Linker »  

Gerrit-Jan Linker
Linker IT Software
Email WWW Gerrit-Jan Linker   IP Logged
Gerrit-Jan Linker
YaBB Administrator
*****




Posts: 75
Dielectric constant
Reply #1 - 07.08.08 at 10:30:46
 
Dielectric constant
 
Bulk material have no permanent electrostatic moments. The individual molecules take on all sorts of orientations so that on average the potential vanishes. When an electric field is applied across such a bulk volume, the average moments do not  vanish but there will be a preference of individual molecules to align their permanent and response moments with the electric field. The extent to which this preference is present in the bulk is reflected by its dielectric constant.
 
The dielectric constant is measured by reduction of the attractive force between two oppositely charged plates when the bulk material is introduced between them.
 
Ref:  
Thesis Alex de Vries
Back to top
 
 

Gerrit-Jan Linker
Linker IT Software
Email WWW Gerrit-Jan Linker   IP Logged
Pages: 1