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In article <0096652F.B2E94A20@vms.csd.mu.edu> 5916rahmank@vms.csd.mu.edu writes:
>In article <64400002@hpscit.sc.hp.com>, markus@hpscit.sc.hp.com (Markus Jansons) writes:
>>
>>
>->Does any one have any interesting or new  applications experience
>->with maeterials measurments using "electrical" methods.
>->
>->For example, maeauring capacitance and then calculating dielectric
>->constant?  What did you use for fixtures or transducers? If you
>->have or know of anyone doing or would like to do such measurements
>->please  advise me.
>->

What do you mean by fixers or transducers. If you just want to measure 
the capacitance, just sputter some electrodes such as platinum and use 
one of the instruments your company (HP) makes to measure the
capacitance. 

But if your aim is to do materials characterization using Impedance 
Spectroscopy, then it is not trivial. 

>->It could be very beneficial for both of us.....
>->
>->markus jansons               markusj@hpuamsa.neth.hp.com
>->                                 1-408-553-2727  voicemail.
>
>	Perhaps the best way of doing the electrical characterization is
>	the use of Impedance spectroscopy a.k.a immittance spectroscopy.
>	J. Ross Macdonald's book is an excellent treatment on the whole
>	subject including experimental setups. 
>
>	-Anis.
>>
>>


Impedance Spectroscopy, though it is been used for a long time, is
still in its infancy. McDonalds book is perhaps the only book 
written on this subject. He is also responsible for coining the 
term Impedance Spectroscopy.  I recently saw a company (Solartron ?)
demonstrating ac measurements system using McDonalds methods and 
his software developments. But my concern is treating capacitances
arising from real materials as ideal Debye capacitance. In fact it 
has been shown real material relaxation is non-ideal and in some 
cases it can be modeled in terms of an empirical formula to account for
the frequency dependence.

Sankar