To achieve high ionic conductivity in a SOFC, it is very important to tailor the electrolyte properties, simultaneously reducing the operating temperature. One of the few parameters, which play a key role in deciding the efficiency of the electrolyte, is the sintering temperature. Sintering temperature is basically the grain formation temperature for obtaining a dense compact structure of the electrolyte material simultaneously increasing the ionic conductivity. Samaria doped ceria (SDC) composite electrolyte material is one of the potential choices for low temperature with high ionic conductivity. This work aims to investigate the effect of sintering temperature in the granularity of the microstructure and its relation with the ionic conductivity of SDC composite. SDC nanoparticles were synthesized by a modified co-precipitation method, where no additional water has been utilized during the co-precipitation process in order to minimize the particle agglomeration, which is caused by the hydrogen bonding. Synthesized particles were calcined at 650°C in air and the green body made from it were sintered in air at higher temperature to achieve high density pellet. XRD and Raman spectroscopy were performed for structural analysis, which confirmed presence of single phase cubic structure of SDC nanoparticles. The green body formed from the calcined powder samples were sintered at different temperatures varying from 1100-1450°C. The morphological variation occurring on the electrolyte pellet due to temperature change was observed using FESEM, which depicted that sintering at very high temperatures like 1450°C results in almost 96-97% dense electrolyte formation having least amount of porosity. Electrochemical impedance spectroscopy was carried out for measuring the ionic conductivity of the sintered material. EIS was done over a range of temperature between 450-700°C. The study correlates effect of sintering temperature on both grain and grain boundary ionic conductivity.