在微波介電材料中，Ba2Ti9O20具有高介電係數，低溫度係數及介電損失，因此為常被應用於製作介電共振器的材料之一。本研究以超微粒(30~50nm)的BaTiO3與TiO2為反應的前導粉末，以固態氧化物混合法合成Ba2Ti9O20相，並對其合成機構與微波介電性質等方面做探討。
相較於傳統使用BaCO3與TiO2為反應的前導粉末，需添加SnO2才可生成單一相Ba2Ti9O20，BaTiO3無論在結構上或化學均勻性上都較BaCO3更接近Ba2Ti9O20相，因此可以不需添加在1100OC、6小時煆燒得到單一相的Ba2Ti9O20。並探討添加SnO2對微波介電性質的影響。

此外，以直接燒結的方式將BaTiO3與TiO2為2:7的比例在1350OC、4小時做燒結，仍然可以得到Qxf=35000、K=38的陶瓷體。

最後嘗試在97% N2 3% H2的還原氣氛中燒結，意圖利用氧空缺幫助燒結，雖未能達到緻密，但經過空氣中1200OC退火後仍可得到Qxf=32000、K=39的陶瓷體。

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