Preparation and Electrical Properties of the Fine Particle Strontium (Calcium) Titanate Ceramics

• Main Authors: Wein-Duo Yang, 楊文都
• Other Authors: Professor Chen-Feng Kao
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/54379365046386240042

博士 === 國立成功大學 === 化學工程研究所 === 84 === Titanium alkoxide in strong alkaline condition can react with strontium ion to become strontium titanate without any external heat. Because titanium alkoxide is easy to react with the mois- ture in the air to form hydrolyzed gel of titanium dioxide to affect the quality of the product. Titanyl acylate precursor from chelating acetic acid with titanium alkoxide can be dissolved in water and be reacted with strontium ion to form strontium titan- ate powder in strong alkaline solution. In the studies that the preparatory conditions of titanyl acylate precursor reacting with strontium ion to form strontium titanate powder in a strong alkaline solution conditions, reac- tion temperature, the water content of forming titanyl acylate precursor, the ratio of water/titanium alkoxide and the ratio of acetic acid/titanium alkoxide, have been studied the effect on the particle size, stoichometry and sinterability of making cer- amic powder. The preparatory variables affect indirectly the amount of chelating acetate group, change the mode of condensa- tion of the gels and even control the particle size of the powder . The reaction rate of forming powder, at lower temperature (room temperature) and less water content (water/ titanium alkoxide = 5) or fewer acetic acid (acetic acid/ titanium alkoxide =5), is slow and the particle size of the powder is bigger. That the sinter- ability of powder is no so good. On the contrary, that of form- ing powder, at higher temperature such as 373 K and more water content (the ratio of water to titanium alkoxide is 20) or larger acetic acid (the ratio of acetic acid to titanium alkoxide is 10) , is rapid and the particle size formed is finer at 0.1um.(omit)