酸鋇結構之材料具備壓電性、鐵電性以及高介電性質，此一系列之陶瓷體在現今科技產業中應用廣泛。目前工業上鈦酸鋇粉末的合成方法以固態反應法為主，以二氧化鈦及碳酸鋇為起始原料，經混合及高溫熱處理（1200 ℃）後，合成鈦酸鋇。

本研究改變傳統固態反應法之乾燥漿料之步驟，以噴霧乾燥取代烘箱乾燥方法。噴霧乾燥本為陶瓷製程上一種造粒方法，形成顆粒堆積緊密之圓球凝聚體，與烘箱乾燥之顆粒隨機散佈比較，顆粒間接觸面增加許多；此外，噴霧乾燥能快速乾燥漿料，顆粒混合於乾燥過程較不被影響，保持良好混合，獲得較低熱處理溫度。

實驗方面以奈米碳酸鋇及二氧化鈦混合粉末與微米碳酸鋇及二氧化鈦混合粉末作為起始原料。微米粉末經球磨混合 0.5 小時後，噴霧乾燥無助降低熱處理溫度，反而受顆粒原始形態之限制，形成非計量比之凝聚體，未能合成鈦酸鋇；微米粉末球磨混合 24 小時，噴霧乾燥後之熱處理溫度雖與烘箱乾燥之後熱處理溫度相同，但可減少持溫時間。奈米粉末經球磨混合 0.5 小時、噴霧乾燥後，經 800 ℃、1 小時之熱處理即合成鈦酸鋇，與其它奈米粉末經不同球磨時間、不同乾燥方式之熱處理溫度相較之下，熱處理溫度大幅降低 250 ℃。但奈米粉末於球磨 24 小時過程中，因添加較多量分散劑調整漿料黏度，以致噴霧乾燥時形成甜甜圈狀凝聚體，凝聚體其內部顆粒會發生偏析現象，反而使得顆粒混合不均，故無法於較低溫（800 ℃）之熱處理獲得鈦酸鋇。

Barium-titanate-based ceramic materials are applied widely due to its piezoelectricity, ferroelectricity, and excellent dielectric properties. The major route of preparation of barium titanate is solid-state reaction of barium carbonate and titania mixed at temperatures as high as 1200 ℃.

This study substitutes spray drying for traditio- nal drying in solid-state reaction. Basically, spray drying is one of the granulation routes. Closely-packed granules will appear via spray drying. Compared with loosely-scattered particles via tradition drying, the particle contacts of closely-packed granule seem more. Furthermore, spray drying can dry suspension rapidly. Consequen- tly, well-mixed state of suspension is the same as that of drying powder. In accordance with above two characteristic of spray drying, lower synthesis temperature of barium titanate is expected.

One mixture of nano-sized and the other mixture of micro-sized are raw powders. The morphology of the micro-sized powder with milling for 0.5 h leads to forming nonstoichiometric granule via spray drying. Therefore, barium titanate can’t be formed after calcination. Although the synthesis temperature of barium titanate for micro-sized powder with milling for 24 h followed via spray drying and via traditional drying are the same, using spray drying can contract the reacting time. For nano-sized powder with milling for 0.5 h followed via spray-drying, barium titanate calcined for 1 h at 800 oC is formed. Compared with other nano-sized raw powders with distinct milling time followed by distinct drying method, it lowers the synthesis temperature of barium titanate by ca. 250 ℃.

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