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Tantalum pentoxide and yttrium oxide were used as base materials. By adding alkali metal sintering agent Li2CO3, the doped tantalate ceramic samples were prepared by high temperature solid-phase sintering. The effects of alkali metal sintering agent Li2CO3 on the physical and chemical properties of rare earth yttrium tantalate coating were studied by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), laser pulse method (LFA), thermal-mechanical analyzer (TMA) and UV-visive-near-infrared spectrophotometer. The results show that under the sintering system at 1530℃, the ceramic is compact, resulting in Li3TaO4 ceramic. With more Li2CO3 inclusion, the higher Li3TaO4 of the second phase is generated. With a stable thermal expansion coefficient, the range of 8.2-8.6×10-6K-1(900℃); The Young's modulus and hardness of the samples decreased with the increase of the added sintering aid dose. When 6% alkali metal sintering agent Li2O3 is mixed into the ceramic, the transmittance rate of YTaO4 ceramic can be stable at more than 80%, which shows that YTaO4 ceramic has superior potential of optical ceramics.
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