本研究以 MgAl2O4為主體，利用固態反應法合成 (Mg1-xMx')Al2O4，其中M' = Zn 與 Ni，於 1480℃到 1600℃進行燒結，討論添加 M'前後，對材料及微波介電性質 之影響；由實驗結果得知合成 (Mg1-xZnx)Al2O4 (x = 0-0.1) 相。
當 Zn微量添加 ( x = 0.05)，其材料微波介電性質最佳，介電常數 ~ 7.93–8.11、Q×f ~ 156,000 GHz (15.6 GHz)
與溫度頻率飄移係數介於 –55 ~ –70 ppm/℃，其燒結體相對密度為 97.2%；當未添加Zn 之 MgAl2O4，Q×f ~ 86,000 GHz，
由此得知，微量添加 Zn對於材料之品質因子可提升約 82%。
另一方面，合成 NiAl2O4，介電常數約 7.78–8.04，Q×f最高值 ~ 62,000 GHz，溫度頻率飄移係數於 –48~ –50 ppm/℃，相對密度為 90.5%，
其固溶體部分 (Mg1-xNix)Al2O4(x = 0–1)，當 x = 0.25時，可獲得最佳微波介電特性，介電常數介於8.18–8.21之間，Q×f ~ 130,000 GHz (15.4 GHz)，
溫度頻率飄移係數於 –51 ~ –65 ppm/℃；(Mg1-xNix)Al2O4(x = 0–1)，於相同燒結條件下，隨 Ni添加量增加，嘗試計算其極化率、晶格體積以及相對密度。
根據各項結果顯示，(Mg1-xMx')Al2O4，其中M' = Zn 與 Ni， 隨 M'添加量改變，可討論受外在與內在之因素的影響包括，密度 (孔隙率)、晶格常數、極化率、晶粒大小變化，進而探討微波介電性質與材料性質之關係。

MgAl2O4 -based microwave dielectric ceramics substiute Mg by Zn and Ni were synthesized using the solid state reaction forming spinel solid solution of
(Mg1-xMx')Al2O4，M' = Zn and Ni.
Dense ceramics were obtained by sintering at 1480℃ to 1600℃, in air for 3 h.
It can be observed from X-ray diffraction result that the single phase solid solutions.
The microwave dielectric properties of MgAl2O4,
the dielectric constant 7.67-7.99, Q×f ~ 86,000 and τf -65 ~ -68 ppm/℃.
With small amount Zn ion substitution for Mg^(2+)at x = 0.05, The dielectric constant of (Mg0.95Zn0.05)Al2O4 from 7.93 to 8.11, compare with MgAl2O4 ,
ceramics while the Q×f value had significantly improved up to maxmal value of 156,000 GHz (15.6 GHz) and τ_f values from –55 to –70 ppm/℃.
Moreover,MgAl2O4 microwave dielectric ceramics were modified by Ni ion substitution for Mg forming (Mg1-xNix)Al2O4 at x = 0-1.
The compounds NiAl2O4 , dielectric constant ~ 7.78–8.04, Q×f ~ 62,000 GHz and τf ~ –48~ –50 ppm/℃. With Ni ion substitution for Mg ion at x = 0.25, the Q×f
increase to 130,000 GHz (15.4 GHz), εr ~ 8.18–8.21 and τ_f from –51 to –65 ppm/℃.
Relying on the result, it could be discussed the relationship of spinel solid solution structure and
microwave dielectric properties, including grain size, density and ionic polarizability in the (Mg1-xMx')Al2O4，M' = Zn and Ni system.

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