由於所有電子產品均朝輕薄短小發展，故電感大多改成積層型式。在製作積層電感時，磁性材料必須要與內部之金屬導體銀共燒，因此燒結溫度必須低於銀的熔點（961℃）。迄今為止，研究較多的低溫燒結鐵氧磁體是 NiCuZn 鐵氧磁體，並已成為目前積層晶片電感所廣泛採用的磁介質材料。但由於受到Snoek’s 極限的影響，NiCuZn 鐵氧磁體只能在頻率小於100MHz的頻段以下才能使用。要在超過100MHz以上的頻段使用，需仰賴擁有高自然共振頻率的六方晶系鐵氧磁體。
高頻及微波用之軟磁性六方晶系鐵氧磁體Co2Z 需在1200℃以上才能燒結緻密，此材料若欲做成積層晶片電感，可低溫燒結的高頻之軟鐵氧磁體之開發就變得非常重要。
本研究藉由改變化學組成以改善Co2Z 的磁性質，藉由添加BB35SZ玻璃降低Co2Z之燒結溫度，期能在 < 900℃溫度下燒結緻密。由實驗結果發現：
（1） Co2Z固溶愈多離子時，於低溫燒結時越容易產生二次相。
（2） 當玻璃添加量越多，Co2Z愈容易分解產生 M 相與其他二次相（U+S）。
（3） y=0.2 x=0.1 之配比經添加2wt% BB35SZ玻璃後，以900℃燒結2h，可
得較佳之磁性質（μ’ = 3.4，Q = 11）

The trends for electric devices were light and slim, most inductors were produced in multilayer form. In multilayer process, ferrite will co-fire with the inner electrode - silver. So the sintering temperature must be lower than the melting point of silver. Most low temperature co-fire ferrite investigations have focus on Ni-Cu-Zn ferrite, but the initial permeability of Ni-Cu-Zn ferrite will decrease dramatically while the frequency is higher than 100MHz due to Snoek's limit. So in higher frequency applications, Ni-Cu-Zn ferrite was substituted by hexa-ferrites.
Microwave inductor, hexa-ferrite Co2Z must sinter above 1200℃, it is unfavorable for multilayer process, because the sintering temperature is higher than the melting point of silver. So we should lower the sintering temperature of Co2Z.
In this study, we envisage improving magnetic properties by varying chemical composition, and decrease the sintering temperature below 900℃ by adding BB35SZ glass. The experiment results exhibit:
(1) At lower sintering temperature, added excess soluble ions in Co2Z will cause second phase formation.
(2) When more BB35SZ glass was added, Co2Z will decompose to M phase and other second phases such as U phase or S phase.
(3) Samples have compositions 3(Ba0.9Bi0.1O)．2(Co0.8Cu0.2O)．12(Fe1.957Zn0.025O3) and added 2wt% BB35SZ glass sinter at 900℃ for 2 hours can get better magnetic properties. (μ’=3.4, Q=11)

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