鈦酸鍶(SrTiO3)隨(111)平面之含量增加，其導電度亦隨之提升，又以具羥基官能基之添加物所製備之鈦酸鍶所含(111)平面含量最為顯著。本實驗利用噴霧熱裂解法製備鈦酸鍶粉體，藉由添加不同濃度(2.5、5、10、15莫耳比率)之添加物，如乙二醇、甘油、1,2-丙二醇等，進而探討其對粉體所造成不同平面含量之差異。由粉體所製成的生坯於1500℃之燒結溫度持溫1小時後，待溫度降至室溫，完成燒結並得生坯燒結體，即鈦酸鍶塊材。利用X光繞射分析儀(XRD)、傅立葉轉換紅外線光譜儀(FTIR)、掃描式電子顯微鏡(SEM)、穿透式電子顯微鏡(TEM)等儀器分別研究粉體與塊材之相鑑定、化學鍵結及粒子表面型態等。另使用阿基米得(Archimedes)浮力原理分析塊材之相對密度，再利用交流與直流阻抗分析儀量測其導電度。由實驗結果得知，含羥基添加物之鈦酸鍶較無添加物者擁有較高的導電度，又以添加乙二醇者所測得的導電度最高，其次分別為甘油與1,2-丙二醇。此外，pH值之高低會影響羥基生成{111}平面族之含量多寡，經由XRD量測結果分別計算(111)與(100)結晶面之強度比值得知，乙二醇為2.88、甘油為2.65及 1,2-丙二醇為2.64。因此，以乙二醇為添加物所製得之鈦酸鍶相較於其他添加物擁有含量較多的{111}平面族。

Hydroxyl (OH) group that plays important role to increase population of (111) plane was sucessfully applied as additive to enhance the electrical conductivity of strontium titanate (SrTiO3). Different concentrations (2.5, 5, 10, and 15 molar% concentration) of each additive such as ethylene glycol, glycerol, and 1.2 propanediol were investigated. The strontium titanate powders was synthesized by ultrasonic spray pyrolysis. Then sintering process of bulk samples was conducted 1500°C for 1h. Some characterizations for strontium titanate powders and bulks including x-ray diffraction analysis (XRD), fourier transform infrared (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM) have been used to understand the phase change, chemical bonding, and particle morphology. Other analysis for bulk samples including relative density analysis using Archimedes method and AC/DC measurement to measure electrical conductivity of strontium titanate was conducted. The electrical conductivity of strontium titanate was succesfully enhanced by using hydroxyl (OH) group. The conductivity of additive-treated strontium titanate is higher than un-treated strontium titanate. The highest conductivity was generated by EG-treated strontium titanate and followed by glycerol and 1.2 propanediol respectively. Furthermore, the effect of pH value of hydroxyl (OH) group on the mechanism of exposing {111} facet was studied. Based on XRD results, the intensity ratio of (111) peak to (100) generated by ethylene glycol, glycerol, and 1.2 propanediol as additive was calculated of 2.88, 2.65, and 2.64 respetively. It concluded that by using ethylene glycol (EG) as additive, the {111} facet could be exposed more than other additives.

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