First make a sintered pellet and apply silver paste on both side of pellet for electrode. Now you can use it for dielectric measurement.

A typical measurement system consists of a network analyser or impedance analyser, a coaxial probe and software.

The choice of probe and analyser depends on the measuring frequency, but the overall range is from 10MHz to 50GHz. There are high temperature probes that withstand –40 to 200° C, and these can be made with a large flange so they can measure flat-surfaced solid materials as well as liquids and semi-solids.

Software such as the Keysight N1500A materials measurement suite can make it easier to work with a network analyser, by guiding users through test setup and measurement stages, and then converting the resultant S-parameter data it outputs into your choice of formats. The software supports a variety of measurement methods and mathematical models, to meet most application needs.

Source :http://www.newelectronics.co.uk/electronics-technology/six-techniques-for-measuring-dielectric-properties/152591/

You can calculate the dielectric constant of your material using the IS data. You need to calculate the capacitance of your system from the impedance by taking into account the effect of series (contact) resistance and parasitic inductance if necessary. If you know the capacitance and the geometrical dimentions of your sample you can easily calculate the dielectric constant at any frequency. You will find some useful information in this paper:

http://onlinelibrary.wiley.com/doi/10.1002/pip.2586/full

Take parallel capacitance vs frequency and tan(d) vs. frequency data...and calculate the frequency dependent dielectric constant from the parallel capacitance data using the relation:

K= (C*thickness)/(epsilon 0*area of the pellet)

well, it also depends on the samples and measured frequency range.

Impedance analyzer gives the direct values of real permittivity and imaginary permittivity with temperature and frequency. Where, real permittivity is dielectric constant. If data is in capacitance form then you can use the formula as suggested by Shubhum Rao.

Dear Aliza-Aini Md-Ralib , you can easily access to dielectric constant using impedance analyser since both real and imaginary parts of complex impedance are linked to complex dielectric components. You can also calculate the complex modulus components by using this relation: M*=1/epislon*.

He is an article where the calculations are detailed:

Article Electrical property investigations and microstructure charac...

Do not hesitate to contact me if you need more precision,

Best regards,

Dylan

You must to get the complex Capacitance by C*=1/jwZ* and then C*=(complex permittivity) times (geometric properties of your capacitor).