ESR Study of γ-Irradiated K_2SeO_4

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概要

• 論文の詳細を見る

• Structural phase changes in K_2SeO_4 have been found at 129.5°K and 93°K by introducing free radical SeO_4- as a probe. The structure in the temperature range between 129.5°K and 93°K is expected to be orthorhombic with the crystallographic axes coincident with those of room temperature. The unit cell may contain twelve molecules located at three different sites. A superstructure, a tripled lattice parameter along the a axis, has been found by X-ray diffraction method and an expected space group is Pnam. It is ferroelectric along the c axis below 93°K. A possible unit cell contains twelve molecules located at six different sites and is monoclinic in the space group P2_1, in which the superstructure is maintained. The crystal probably consists of fine twins with the common c axis and they are related with each other by mirror planes. The higher transition is of second order and the lower of first order. Conformations of radicals SeO_2- and SeO_3- in the crystal lattice are illustrated.

• 社団法人日本物理学会の論文
• 1970-08-05

著者

• AIKI Kunio

  Department of Electrical and Electronic Engineering, Toyohashi University of Technology

• Aiki Kunio

  Department Of Physics Faculty Of Science Kyushu University:(present Address) Hitachi Central Researc

関連論文

• Control of N Content of GaPN Grown by Molecular Beam Epitaxy and Growth of GaPN Lattice Matched to Si(100) Substrate
• Ferroelectricity in K_2SeO_4
• Electron Spin Resonance of Gamma-Irradiated Potassium Sulphate
• ESR Study of γ-Irradiated K_2SeO_4
• Dielectric and Thermal Study of K_2SeO_4 Transitions
• ESR Study of γ-Irradiated K_2SeO_4
• ESR Study of γ-Irradiated Sodium Thiosulfate Single Crystals

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