本實驗利用固態反應法製作BaMg2GaxFe16-xO27(x=0.0、0.2、0.4、0.6、0.8、1.0)之陶瓷粉體，以研究利用鎵摻雜製作W型鋇鐵鐵氧體時，不同燒結溫度對於晶體微結構、交流磁化率和微波介電性質等影響。OM圖片結果顯示以Ga摻雜的W型鐵氧體樣品，隨著燒結溫度的升高，晶粒尺寸成長。透過Jade 6軟體分析XRD繞射圖譜可以觀察到以Ga摻雜的樣品為P63 / mmc空間群的W型六角鐵氧體，以Topas軟體分析其晶格常數a軸和c軸長接近0.59nm和3.29nm，最佳燒結溫度範圍為1300oC-1350oC，而低於此溫度樣品無明顯燒結反應，燒結溫度高於此溫度時，樣品的相由W型鐵氧體轉變為混合相(W型和尖晶石)。
利用室溫交流磁導儀分析，樣品的交流磁化率隨著燒結溫度提高，其導因於晶粒大小隨著燒結溫度升高而成長，另外所有樣品也均符合Neel磁弛豫行為。燒結溫度1350 oC下的Ga摻雜W型鐵氧體的介電測量結果表明，在摻雜配比為x = 0.6時，樣品的介電常數為最佳。此結果也證明，W型鐵氧體可以通過Ga摻雜來增強介電性能並保持應有的磁性。
In this thesis, the BaMg2GaxFe16-xO27 W-type (with x=0, 0.2, 0.4, 0.6, 0.8, and 1.0) hexagonal ferrites are synthesized by the traditional solid state method to investigate the sintering temperature effect, magnetic and dielectric properties of this ceramics.
OM pictures in the Ga-doping W-type ferrite samples are shown that the grain size increases with sintering temperature increasing. The Ga-doping W-type ferrites phase of the samples is hexagonal structure with P63/mmc space group symmetry, and its lattices constant a-axis and c-axis is near 0.59nm and 3.29nm.
X-ray Diffraction patterns of all samples have been analyzed by the “Topas” software. The optimal sintering temperature range is 1300-1350oC, the samples can’t observe the sintering behaviors, which the sintering temperature is below this conduction, then samples’ phase are change from W-type ferrites to mixed phase (W-type and spinel) with the higher sintering temperature.
The room temperature AC magnetic susceptibility measurement reports that all samples obey Neel magnetic relaxation behavior. The AC magnetic susceptibility of samples is increasing with sintering temperature increasing due to grain growth.
The dielectric measurement of 1350oC sintering temperature Ga-doping W-type ferrites is showed that the dielectric constant of samples is optimal gallium’s doping amount at x=0.6. This result indicates that the W-type ferrites can enhance the dielectric property and maintain magnetization by Ga-doped.
