weakly conducting materials?

In connection with a prototype design I'm developing for a meteorological
measurement device, I'm looking for a readily available material with the
following physical properties:
1) Resistive, but not an insulator -- it will be used for resistive heating
by passing a current (perpendicularly) through a thin sheet sandwiched
between two flat metal conductors (like a leaky capacitor). Target
resistivity of the material is in the range 10 to 10**4 ohm*meter at
temperatures between 0 and 100 C.
2) A positive temperature coefficient (this apparently rules out silicon,
for example).
3) Reasonably easy to work with in sheets or disks of order 0.1 mm
thickness, 30 cm diameter.
4) Not subject to significant degradation or aging, even at sustained
temperatures near 100 C for days or weeks at a time.
If anyone either knows offhand of a material matching the above description
or can point me to a good tabulation of candidate materials, please let me
Prof. Grant W. Petty
Atmospheric and Oceanic Sciences
1225 W. Dayton Street
University of Wisconsin-Madison
Madison, WI 53706
Tel: (608) 263-3265
Fax: (608) 262-0166
Reply to
Grant W. Petty
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