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Effect of La doping on microwave dielectric properties of translucent polycrystalline alumina ceramic

机译：La掺杂对半透明多晶氧化铝陶瓷微波介电性能的影响

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摘要

In this paper, the microstructure and microwave dielectric properties of translucent polycrystalline alumina (PCA) with different amounts of La_2O_3 (co-doped with 500 ppm MgO) were investigated. Compared with those doped only with 500 ppm MgO, the translucent PCA co-doped with 500 ppm La_2O_3 exhibited a higher Q × f value, which might be caused by the significantly larger ionic radius of La~(3+). As the La_2O_3 content was further increased, the presence of an increasing amount of impurities (LaAl_(11)O_(18)) would deteriorate the Q × f value significantly.
机译：本文研究了不同含量的La_2O_3（共掺杂500 ppm MgO）的半透明多晶氧化铝（PCA）的微观结构和微波介电性能。与仅掺杂500 ppm MgO的半透明PCA相比，共掺杂500 ppm La_2O_3的半透明PCA具有更高的Q×f值，这可能是由于La〜（3+）的离子半径显着增大所致。随着La_2O_3含量的进一步增加，杂质（LaAl_（11）O_（18））的增加会大大降低Q×f值。

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