隨著通訊頻率往高頻化發展，使得發展高品質因子的微波介電陶瓷為未來的趨勢。LnAlO3系列陶瓷，由於其擁有優異的品質因子且製程條件較容易，因此，適合用於高微波特性之低溫共燒陶瓷中。在此系列中，YAlO3雖然具有極高的Q x f 值，然而，必須要在較高的燒結溫度下才可獲得緻密的燒結體，因此，降低YAlO3陶瓷的燒結溫度便是一項相當重要的研究課題。
在本論文研究的第一部分，即利用固相反應合成法合成釔鋁鈣鈦礦(YAlO3)的粉末，並添加不同含量之助燒結劑B2O3於合成之釔鋁鈣鈦礦(YAlO3)陶瓷內，研究其燒結行為、微結構以及微波介電性質之影響。實驗結果顯示利用1400℃/2h 進行煅燒可得到最少雜相之粉末，所合成的YAlO3粉末分別加入2、4、6wt%之助燒結劑B2O3均勻混合後，以1550-1650℃/9h進行燒結。結果顯示添加B2O3助燒結劑有助於提升YAlO3陶瓷之視密度，其中添加2wt% B2O3於1650℃燒結所合成之YAlO3，其視密度值可高達5.18g/cm3(相對密度97%)，且其介電常數值可達15.06，此與YAlO3陶瓷之介電常數理論值15.7相當接近，其後隨著B2O3添加量的增加而介電常數逐漸下降，其主要原因為B2O3的介電常數值低於YAlO3；而最大之Q x f值為添加4wt% B2O3的YAlO3陶瓷，其值為12,724GHz。
在本論文研究的第二部分，即利用反應燒結法直接添加不同含量之燒結促進劑B2O3於起始粉末(Y2O3及Al2O3)內，未經煅燒的步驟直接將其進行燒結，研究其燒結行為、微結構以及微波介電性質之影響，實驗結果顯示，助燒結劑(B2O3)的添加量於2wt%以上時所合成之YAlO3陶瓷可於燒結溫度1500℃時即達燒結緻密的效果，其降低燒結溫度的效果優於本研究第一部分，添加2wt%B2O3於YAlO3陶瓷，於1500℃燒結9小時時即可獲得燒結緻密之試片，且仍具有較佳之微波介電性質：介電常數εr 為14.7，Q x f值為23,774 GHz, τf 為-91.5 ppm/℃。
在本論文研究的第三部分，即利用固相反應合成法合成xYAlO3 – (1-x) CaTiO3陶瓷(0.1≦x≦0.9)，研究x值對燒結行為、微結構以及微波介電性質之影響，實驗結果顯示YAlO3及CaTiO3呈現固溶的現象，晶格常數及單位晶胞體積隨著x值的增加而逐漸下降，主要是由於A-site及B-site位置同時置換入較小的離子所致；xYAlO3 – (1-x) CaTiO3陶瓷的介電常數隨著x值的增加而降低，主要是因為YAlO3的介電常數低於CaTiO3所造成的結果，而在x = 0.5時，xYAlO3 – (1-x) CaTiO3陶瓷可在1500℃燒結9小時下即可獲得緻密之燒結體，並擁有良好的微波介電性質：介電常數εr為26.1，Q x f值為24,656 GHz, τf 為-61.0 ppm/℃。

As the telecommunication and satellite broadcasting industry develop for high frequency bands, the demand for microwave dielectric ceramics is relatively high Q x f value. There are excellent Q x f value and the process is much easier than others materials for LnAlO3 series ceramics, so they suit to apply for high frequency bands. Although YAlO3 ceramics has excellent microwave dielectric properties in this series ceramics, the sintering temperature is too high to get compact bulk. This is important topic for YAlO3 ceramics to lower sintering temperature.
In first part of this research, The YAlO3 powders were synthesized by conventional solid state method. The influences of different amount of sintering additive (B2O3) in the YAlO3 ceramics were investigated in respect of sintering behavior, microstructure and microwave dielectric properties by using density measurement, XRD, SEM and cavity method. Experimental results show that using the calcining conditions of 1400℃/2h to synthesize YAlO3 powders which can get the least amount of second phase. Adding sintering additive (B2O3) in the YAlO3 ceramics can increase apparent density values. When adding 2 wt% B2O3 in the YAlO3 ceramics, apparent density value can up to 5.18g/cm3 (relative density value is 97%). And the dielectric constant can up to 15.06. This value is very close to the theoretical values of YAlO3 ceramics. When adding 4 wt% B2O3 in the YAlO3 ceramics, Q x f value can up to 12,724GHz.
In second part of this research, the different amount of sintering additive (B2O3) in the YAlO3 ceramics were synthesized by reactive sintering method. The influences of different amount of sintering additive (B2O3) in the YAlO3 ceramics were investigated in respect of sintering behavior, microstructure and microwave dielectric properties by using density measurement, XRD, SEM and cavity method. Adding 2 wt% B2O3 in YAlO3 ceramics can get compact bulk at 1500℃. The YAlO3 ceramics with 2 wt% B2O3 which was sintered at 1500℃ for 9 hours could have a good sintering density and maintain good microwave dielectric properties：εr = 14.7, Q x f = 23,774 GHz, τf = -91.5 ppm/℃.
In third part of this research, The xYAlO3 – (1-x) CaTiO3 ceramics (0.1≦x≦0.9) were synthesized by conventional solid state reactive method. The influences of x value in the xYAlO3 – (1-x) CaTiO3 ceramics were investigated in respect of sintering behavior, microstructure and microwave dielectric properties by using density measurement, XRD, SEM and cavity method. Experimental results show that YAlO3 and CaTiO3 are complete solid solution. The lattice parameters and unit cell volume increase with x value increases. This is because that A and B site of the structure of ABO3 were substituted for small ions at the same time. The dielectric constant of xYAlO3 – (1-x) CaTiO3 ceramics decreases with x value increasing. This is because that the dielectric constant of YAlO3 is lower than CaTiO3. The xYAlO3 – (1-x) CaTiO3 ceramics for x = 0.5 which was sintered at 1500℃ for 9 hours could have a good sintering density and maintain good microwave dielectric properties：εr = 26.1, Q x f = 24,656 GHz, τf = -61.0 ppm/℃.

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