Dielectric, X-Ray, and Optical Study of Ferroelectric Cd 2 Nb 2 O 7 and Related Compounds
Dielectric, X-Ray, and Optical Study of Ferroelectric Cd 2 Nb 2 O 7 and Related Compounds
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铁电体 Cd 2 Nb 2 O 7 及相关化合物的介电、X 射线和光学研究
DOI：
10.1103/physrev.98.903
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发表时间：
1955
期刊：
影响因子：
--
通讯作者：
R. Pepinsky
中科院分区：
文献类型：
--
作者：
F. Jona;G. Shirane;R. Pepinsky
Single crystals of ${\mathrm{Cd}}_{2}$${\mathrm{Nb}}_{2}$${\mathrm{O}}_{7}$ have been grown, and dielectric, x-ray, and optical studies have been carried out on these above and below the ferroelectric Curie point. The x-ray analysis confirms the pyrochlore structure, and gives the oxygen parameter $x=0.305$ at room temperature. The symmetry below the Curie point, -85\ifmmode^\circ\else\textdegree\fi{}C, is uncertain, due to the very slight lattice distortion: $\frac{c}{a}$ is about 1.0005 if the ferroelectric phase is tetragonal. The spontaneous polarization along the cubic (111) axis is 6 microcoulombs/${\mathrm{cm}}^{2}$ at -180\ifmmode^\circ\else\textdegree\fi{}C.
Single crystals of ${\mathrm{Cd}}_{2}$${\mathrm{Nb}}_{2}$${\mathrm{O}}_{7}$ have been grown, and dielectric, x-ray, and optical studies have been carried out on these above and below the ferroelectric Curie point. The x-ray analysis confirms the pyrochlore structure, and gives the oxygen parameter $x=0.305$ at room temperature. The symmetry below the Curie point, -85\ifmmode^\circ\else\textdegree\fi{}C, is uncertain, due to the very slight lattice distortion: $\frac{c}{a}$ is about 1.0005 if the ferroelectric phase is tetragonal. The spontaneous polarization along the cubic (111) axis is 6 microcoulombs/${\mathrm{cm}}^{2}$ at -180\ifmmode^\circ\else\textdegree\fi{}C.