本研究利用傳統固態反應法合成 Ba(Mg1/3Nb2/3)O3與 Ba(Co1/3Nb2/3)O3系統，並分別利用控制降溫速度於 0.2 ℃/min和自然爐冷的燒結方式，以及在 Ba(Mg1/3Nb2/3)O3系統中，利用不同去凝聚方法改善晶粒大小的均勻度，觀察其結晶結構上的有序-無序相轉換情形。並藉由X光粉末繞射、拉曼光譜之分析和有序程度參數 (ordering parameter，S)、domain size之計算以及穿透式電子顯微鏡 (TEM) 的觀察，判斷晶體結構之有序程度變化與微波介電性質的關聯性。發現隨著燒結溫度的不同和冷卻速率的降低，以及晶粒大小的均勻度，將會影響 B-site陽離子有序程度以及 domain size的變化，進而改變 Q × f值。
綜合各項結果顯示，在 Ba(Mg1/3Nb2/3)O3系統中，在樣品 1600S-A之domain size有其最佳尺寸約為 57 nm，其介電性質為 Q × f = 78,000 GHz，εr = 32，τf = 23 ppm/℃。Ba(Co1/3Nb2/3)O3系統中，在樣品 1350S有最佳的介電性質：Q × f = 36,000 GHz，εr = 31，τf = -5.5 ppm/℃。

The effect of conventional solid state methods and different heat treatment conditions by controlling the cooling rate at 0.2 ℃/min with no soaking time and without control of cooling rate significantly of Ba(Mg1/3Nb2/3)O3 and Ba(Co1/3Nb2/3)O3 systems are investigated. Besides, in BMN system, we observe the order-disorder transition condition in crystal structure by improving the homogeneity of the grain size with different de-agglomerating methods. The samples are characterized the relationship between the ordering degree of the crystal structure and the microwave dielectric properties by the analysis of X-ray powder diffractiometer, Raman spectroscopy, transmission electron microscopy (TEM) , the calculation of the ordering degree and the domain size. This study investigates that different sintering temperature, decrease in the cooling rate and the homogeneity of the grain size induce the ordering degree of the B-site cations, the variation of the domain size and Q × f values.
In this investigation of BMN, the sample of 1600S-A obtains the best dielectric properties (Q × f = 78,000 GHz，εr = 32，τf = 23 ppm/℃ ). In BCN system, the sample of 1350S obtains the best dielectric properties (Q × f = 36,000 GHz，εr = 31，τf = -5.5 ppm/℃ ).

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