| Summary: | 碩士 === 國立中山大學 === 材料科學研究所 === 93 === Bi4Ti3O12(BIT) is ferroelectric ceramics material. It’s application on capacity, conductor, memory device, and sensor. It’s curie point at 675oC. When the temperature above 675oC, the structure of BIT is tetragonal (space group is I4/mmm). As temperature below 675oC, because BIT effected by inner strain, the structure of BIT transform from tetragonal to orthorhombic (space group is B2cb). And then, it may transform from orthorhombic to monoclinic. The texture assuming the structure of BIT is orthorhombic. This texture use x-ray anglicizing to determine component of BIT. On the other hand, using optical microscopy and scaning electron microscopy to observe the surface structure. Because of phase transformation, this texture confirm BIT have 101 twin by images and diffraction pattern of transmission electron microscopy. Further, this texture also find that BIT may have 180o domains on some grains.
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