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Investigation on Spectra of Barium Titanate Ceramics Materials

Author: JinXueQin
Tutor: SunDaZhi
School: Shanghai Normal University
Course: Applied Chemistry
Keywords: Barium titanate Ceramics IR UV - visible spectroscopy Aging effects
CLC: TQ174.1
Type: Master's thesis
Year: 2008
Downloads: 231
Quote: 0
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Abstract


Barium titanate ceramic material is octahedral structure with a representative ferroelectric crystal , it has excellent piezoelectric and dielectric properties , the information on the testing , conversion, processing and storage technology occupies an extremely important position. Especially doped barium titanate semiconductor ceramic PTCR characteristics of the thermistor and basic control components and other areas has broad application prospects. This paper aims to barium titanate materials by doping research, to explore the variation of the microstructure and ferroelectric properties in order to establish and barium titanate doped tetragonal structure change and its impact on performance relationship . In this paper, a typical perovskite barium titanate for the study, prepared by sol-gel method is mainly doped alkali metal ions and alkaline earth metal ions , barium titanate ceramic material. Doping produced using different types of defects , changes in the distribution of atoms in the equilibrium position of the degree of ordering . By X -ray diffraction , infrared spectroscopy and UV - visible spectroscopy testing technique to study the A, B site doping replace its structure and performance, and its mechanism was discussed. Through a variety of spectra and ferroelectric properties of materials and measurement stability over time , explores the doped titanium oxide octahedral distortion and the Curie temperature, aging effects, etc. ferroelectric properties. Study found that as the doping amount of change and changes in ionic radius , IR and UV - visible spectrum has a corresponding change regularly ; dopant ion polarization and oxidation that affect UV - visible spectrum absorption edge position. In addition , the paper also studied the doped barium titanate ceramics replace aging effects. The number obtained point defects affecting the material is an important factor stability conclusion and can be characterized by infrared spectroscopy stability of the material . Its stability and oxygen ion vacancies in the crystal structure may also be the location of the close relationship . The study also shows that the infrared spectrum Ti-O bond absorption peak wavenumber variation is due to the aberration of the oxygen octahedron , it may be the Curie temperature, the remnant polarization , coercive field change reason.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Basic theory
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