Dear Sukhawipat,

Depends on the conductivity of your sample! Please, make a pellet (about 13 mm or higher of diameter per 1 mm thickness), paint Ag colloidal on the parallel surfaces and measure the conductivity. If the conductivity is small, you need measure a four-probe measurement. If not, you can measure the in a two-probe measurement. Observe, when you are painting the surfaces, please paint one side full and the other side you make a bullet contact. So, if the conductivity is small, you can make the other contacts and can use the same sample. When the conductivity is medium (at around 10^6) perhaps you can use a conventional 51/2 digits voltmeter and a DC voltage source, that are simple instruments. Remember, to measure the DC conductivity you need to measure the resistance, which is a size-dependent property. Thus, you can make a large sample in diameter and small in thickness in order to use the above instruments. Also, if your sample is a ceramic one, it's better, always, measure the resistance between two faces. In this form you observe the pores contribution.

Thank you every one

Please come to me, your problem will be solved easily :)

OK, thank you help me please.

How I can do it?

I am the student who have these problems, but these can't solve by myself.

If your institution has the facility, then, Broad band Dielectric Spectrometer (BDS) will solve your problem.

Thank you Mr. Toka Swu, Where is BDS that I can use in Thailand ?

Dear Nathapong, I am extremely sorry but I am not from Thailand and so I have no idea about the availability of BDS in Thailand.

Ahh!! Thank you for your helping me.

Your idea about the equipment that can test these properties is good and I will search this equipment that nearby my country.

Your helping is the best things for me

You should prepare flat specimen (e.g. a disk) with a diameter of few cm-s and a thickness of 1-2 mm. Then you should paint or evaporate concentric metal electrodes on both sides (you may use a guard ring on one side too) and you can try to measure the conductivity by a simple ohmmeter. (Depending on the conductivity the test voltage and the sensitivity of the ohmmeter should be changed). Under DC conditions you get a rough estimate. Of course, using a broadband spectrometer you can get a more complex picture at several frequencies.

Nathapong, Im in Thailand ! , come to me, meaning send me your samples, then your problem will be solved. . anyway, please keep in mind those useful techniques the other researchers answered you .

Ok. Thank you everyone that prove these problem to me.

I will discuss with my teacher before I decide to test it.

Four-probe method can be used for determination of DC conductivity. See for example, J. Electrochem. Soc. 1996 143(5): 1736-1744; doi:10.1149/1.1836709. Or two-probe method can be used for impedance spectroscopy analysis.

Thank you Mr. Beihai Ma for your advice.

Dear Sukhawipat,

Depends on the conductivity of your sample! Please, make a pellet (about 13 mm or higher of diameter per 1 mm thickness), paint Ag colloidal on the parallel surfaces and measure the conductivity. If the conductivity is small, you need measure a four-probe measurement. If not, you can measure the in a two-probe measurement. Observe, when you are painting the surfaces, please paint one side full and the other side you make a bullet contact. So, if the conductivity is small, you can make the other contacts and can use the same sample. When the conductivity is medium (at around 10^6) perhaps you can use a conventional 51/2 digits voltmeter and a DC voltage source, that are simple instruments. Remember, to measure the DC conductivity you need to measure the resistance, which is a size-dependent property. Thus, you can make a large sample in diameter and small in thickness in order to use the above instruments. Also, if your sample is a ceramic one, it's better, always, measure the resistance between two faces. In this form you observe the pores contribution.

Thank you mr. Paschoal