Hi

i have no idea about molten state materials but i think the material in this book might help you out

semiconductor material and device characterization - D.K schorder

starting 10 pages have resistivity measurement using 2 and 4 point probe have a look

Hello, I hope that the two probe I-V measurement or resistance measurement will be useful for you since your material is high resistive material. So, take two Crocodile clips and fix them with 1 cm gap. Then, heat the sample to required temperature and measure either I-V or direct resistance. Here, the area of the materials will be about 1 cm2. If you measure I-V, then inverse slope of the I-V curve is equal to the resistance of your sample. Good luck.

Thank you Dr Kumar, I am working with molten glass so solid state is not appropriate for me. 

Thank you Dr Reddy, But with Crocodile clips we can not measure electrical resistance of molten state material. the temperature is 1000 to 1500 C and after 1200, the glass is melt.

Hi, did you already solve your problem? There are papers containing IS experiments on melts at high P/T. In those cases one electrode is a metal capsule (containing the melt) itself while the second electrode is a wire in the center of the capsule. The wire is isolated from the capsule by boron nitride or a cement or ceramic.

Check this paper: Fabrice Gaillard, Laboratory measurements of electrical conductivity of hydrous and dry silicic melts under pressure, Earth and Planetary Science Letters 218 (2004) 215-228

For your problem with the cell constant check coaxial cable here:

http://en.wikipedia.org/wiki/Capacitance#Capacitance_of_simple_systems

Thanks Dawid, Yes, I solved the problem and could measure electrical resistivity of the glass by two-wire method

Hey Dr Soleimani,

How did you solve this problem?

Can you explain it to me in Details?