鈦酸鍶目前應用廣泛，如電容器、壓敏電阻及固態氧化物電池等。而這些應用皆與鈦酸鍶微結構相關，因此如果能夠控制並操控多晶鈦酸鍶微結構將可提升性質上的表現。多晶材料微結構與起始粉體形貌、結構、粒徑分佈息息相關。固本研究藉由噴霧熱解法合成鈦酸鍶粉體，並於前驅物中添加含有不同OH基之添加物(檸檬酸，醋酸，雙氧水)，改變鈦酸鍶粉體形貌、結構及粒徑分佈。配合熱重損分析前驅物物理性質，X光繞射技術分析粉體結晶結構，電子顯微鏡觀察粉體形貌及結構。實驗結果發現，添加物的使用，改變鈦酸鍶粉體樣貌與結構，且並無明顯阻礙鈦酸鍶粉體成分。綜合實驗結果並加以分析推論出鈦酸鍶粉體形貌及結構成形機制。後續將合成鈦酸鍶粉體進行壓錠與高溫燒結(1500 oC)，利用電子顯微鏡背向散射繞射技術觀察多晶鈦酸鍶晶粒尺寸與Σ3晶界數量；並量測鈦酸鍶於各溫度下導電度。由實驗結果發現，添加物中的OH基可降低鈦酸鍶晶體表面(111)的表面能；造成晶體表面形成非立方體結構形貌。此外，較多(111)平面於晶體表面有助於在燒結過程中，Σ3晶界的形成。而在電性上的表現也發現，較多Σ3晶界數量存在多晶鈦酸鍶塊材內，可提高鈦酸鍶的導電度並降低晶界活化能。本研究成功利用噴霧熱解法操控起鈦酸鍶始粉體形貌及結構。而藉由起始粉體形貌及結構之控制，可於燒結過程中提升多晶鈦酸鍶Σ3晶界數量，進而改善多晶鈦酸鍶導電度及活化能。

Microstructures of polycrystalline material relate with particle morphologies, structure and size distributions of starting powder. Hence this study synthesized SrTO3 powder by spray pyrolysis with various additives (citric acid, acetic acid and hydrogen peroxide) to manipulate particle morphologies, structures and size distributions. To characterize the physic properties of precursor solution, crystallographic structures of synthesized powder, particle morphologies and structures, thermogravimetric analysis, X-ray diffractometer, scanning electron microscopy and transmission electron microscopy were applied. According the experimental results and analyses, the mechanisms of particle formation were proposed. To investigate the influences of starting powder with various structures on sintering process, the synthesized SrTiO3 powders were sintered (1500 oC). Grain boundary orientations and grain sizes were carried out by electron backscatter diffraction technique; in addition, the conductivities were also measured under different temperatures. The results showed that the additives with OH groups reduce surface energy of (111) and crystal surfaces have more (111) orientation; furthermore, the crystal surfaces with (111) orientation induce Σ3 grain boundaries formation. The conductivity results indicate that the higher Σ3 grain boundary populations increase conductivity.

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