X-Ray Diffraction Studies of Electron Polarization in Ferroelectrics

摘要

Electron polarizability in ferroelectrics is studied via a new method developed by the principal investigator. The method, selected electron shell method, allows the independent study of the true electron density of the inner and outer electrons of atoms in crystals. By this method it is expected to get true information about effective electron density as a function of temperature in ferroelectrics. Special interest will be paid to the analysis of the electron polarizability in sodium nitrite, triglycine sulphate, barium titanate and other important ferroelectrics. A systematic study of the electron density of the outer and inner shell electrons will be done using x-ray diffraction data, especially in the neighborhood of the ferro-paraelectric transition. Theoretical models computed via convolution method will be compared with experiments. The knowledge gained will increase the understanding of the fundamentals behind the phenomenon of ferroelectricity in solids, and facilitate the design of ferroelectric devices. (Author)