Materials Literature

文献浏览

按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。

清除
第 120446 / 120567 页 · 当前展示 2,408,901–2,408,920 / 2,411,337 条匹配结果 · 摘要仅作预览

XCV. Symmetry changes in barium titanate at low temperatures and their relation to its ferroelectric properties

H. F. Kay、P. Vousden1949-10-01OpenAlex

Summary The optical changes in BaTiO3 are described, and it is shown that they can be completely explained if the crystal symmetry changes from tetragonal to orthorhombic at -5°C, and then to rhombohedral at -90°C. These changes have been confirmed by X-ray investigations, and it is concluded that the three transition…

Ferroelectric and Piezoelectric MaterialsSolid-state spectroscopy and crystallographyX-ray Diffraction in Crystallography

XCVI. Theory of barium titanate

A. F. Devonshire1949-10-01OpenAlex

Summary The theory of the dielectric and crystallographic properties of barium titanate is considered. By expanding the free energy as a function of polarization and strain and making reasonable assumptions about the coefficients, it is found possible to account for the various crystal transitions. Calculations are ma…

Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisThermal and Kinetic Analysis