複合鈣鈦礦陶瓷材料系統由於具有高介電常數 (εr) 、高品質因數 (Q) 和趨近於零的共振頻率溫度係數 (τf) ，而被廣泛應用於微波介電材料的研究上，然而大多數的研究針對外在因素對介電性質的影響，像是藉由製程提升密度來增進介電性質以及二次相 (secondary phase) 對介電性質的影響等，鮮少有研究探討成分內在因素與介電性質的相互關係。
本研究探討以 Co2+ (0~100 mol%) 添加於 Ba(Mg1/3Nb2/3)O3 複合鈣鈦礦系統對結構與性質的影響，利用X光粉末繞射之結果，並進行 Rietveld 晶體結構精算、拉曼光譜量測與穿透式電子顯微鏡 (TEM) 觀察，配合微波介電性質量測知結果，發現隨著 Co2+ 的添加，εr 有增加的趨勢， τf 則有著從正下降到負的趨勢並有趨近於零的τf ，而 Qxf 則出現了先上升而後下降的趨勢。
綜合各項結果顯示， Ba[Mg(1-x)/3Cox/3Nb2/3]O3 系統的 B-site 有序程度受到 B’-site 陽離子取代出現變化，推測由於 Co2+ 的添加造成 B-site 陽離子有序排列程度的改變，同樣也影響了燒結體的燒結溫度，進而影響了密度，且對 Qxf 同時有了外在與內在因素的影響。

Complex perovskite ceramics with high relative permittivity (εr) , high quality factor (Q) , and low temperature coefficient of resonator frequency (τf) , are investigated on microwave dielectric materials extensively. Nevertheless, most studies focus on the relations between microwave dielectric properties and extrinsic factors ( density, secondary phases etc.) , a few of researches investigate the phenomena between intrinsic factors and microwave dielectric properties.
This study investigates the effect of Co2+ substitution on the crystal structure in a Ba(Mg1/3Nb2/3)O3 (BMN) complex perovskite system using X-ray powder diffractiometer, Raman spectroscopy, and transmission electron microscopy (TEM) ; all the microwave dielectric properties are characterized in the microwave range. As the increasing of Co2+ substitution, the study shows εr increases, τf decreases including reverse sign and nero zero of τf can be obtained. And quality factor increased from x = 0 to x = 0.5, but quality factor decreased after x = 0.5.
Relying on the results, the ordering degree of B-site cations in the BMCN system is changed with the substitution of B-site cations. We speculate that ordering degree, sintering temperature, and relative density in the BMCN system are changed with Co2+ substitution, and these extrinsic and intrinsic factors all make quality factor reduced substantially.

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