Rare-earth silicates (Re2SiO5 and Re2Si2O7, Re: rare-earth elements) have received significant attention and been wildly reported as the most promising EBC materials due to their excellent environment resistance, relatively suitable coefficients of thermal expansion (CTE) and superior phase stability. In this work, powder mixtures of Yb2O3-SiO2 with a molar ration of 1:1 and 1:2 were used to synthesis Yb2SiO5 and Yb2Si2O7 minerals by two different synthesized methods, i.e. in-situ reactive pulsed electric current sintering (PECS) and in-situ conventional pressureless sintering (CS) methods. The effect of the sintering temperature (1450 and 1600 oC) on the synthesized phases and microstructure was investigated by X-ray diffraction (XRD) and Electron Probe Microanalyzer (EPMA). The XRD results showed that both sintering methods can synthesize the desired minerals at 1450 oC with a different purity level. The microstructures showed a lower volume fraction of desired minerals in the PECS specimens as compared to the CS process.