Appareil pour la mesure de moments dipolaires

1970 ◽  
Vol 48 (11) ◽  
pp. 1698-1702 ◽  
Author(s):  
C. Barbeau ◽  
L. Ricard ◽  
J. Turcotte
Keyword(s):  
Dielectric Constant ◽  
Dipole Moments ◽  
Guggenheim Method

A system is described which enables the determination of dipole moments of magnitude 1.0 D from as little as 10−4 mole of substance. The dielectric constant can be measured with a precision of ± 0.000008 unit. Only one weighing is necessary. A modified Guggenheim method, in which only the values of the dielectric constant are required, is used to calculate the dipole moments.

A Cavity Perturbation Technique for Measuring Complex Dielectric Permittivities of Liquids at Microwave Frequencies

1974 ◽  
Vol 52 (23) ◽  
pp. 2365-2369 ◽  
Author(s):  
Abhai Mansingh ◽  
D. B. McLay ◽  
K. O. Lim
Keyword(s):  
Dielectric Constant ◽  
Benzene Solution ◽  
Dipole Moments ◽  
Perturbation Technique ◽  
Relaxation Times ◽  
Microwave Frequencies ◽  
Dielectric Constant And Loss ◽  
End Caps ◽  
Good Agreement

A microwave technique for measuring the complex dielectric permittivity of liquids by using a cylindrical cavity oscillating in the TM010 mode is described. The liquid is placed in a cylindrical teflon cell and the dielectric constant and loss of the liquid are evaluated by measuring accurately the changes in the resonant frequency and Q of the cavity for the composite sample and for the teflon alone. This technique has been used to measure the dielectric constant and loss at 2.4 GHz of some pure liquids and solutions in benzene of ortho and meta isomers of difluoro-, dichloro-, dibromo-, and diiodo-benzene. The measured values for the pure liquids are in good agreement with the literature values. The dielectric relaxation times and dipole moments of the dihalobenzenes in benzene solution evaluated by assuming a simple Debye type dispersion show good agreement with the earlier calculated values derived from Cole–Cole plots based on measurements at several microwave frequencies. This technique, by virtue of the use of a teflon cell and of gold plated end caps, allows the determination of the dielectric properties of corrosive liquids at microwave frequencies and another advantage is that very small liquid samples are required.

A new method for the determination of the dielectric constant in photoconductors

1966 ◽  
Vol 46 (2) ◽  
pp. 210-216 ◽  
Author(s):  
A. Carrelli ◽  
F. Fittipaldi ◽  
L. Pauciulo
Keyword(s):  
Dielectric Constant ◽  
New Method
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