Molecular motion of PO₄ in KDP at ferroelectric phase transition

Toshio Kikuta Department of Physics, Faculty of Science, Hokkaido University, Sapporo, 060, Japan

Akira Onodera Department of Physics, Faculty of Science, Hokkaido University, Sapporo, 060, Japan

Toshihiko Takama Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, 060, Japan

Masahisa Fujita Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, 060, Japan

Haruyasu Yamashita Department of Electronics and Information Engineering, Hokkai-Gakuen University, Sapporo, 064, Japan

Abstract

Molecular motions of PO₄ tetrahedra associated with the paraelectric-ferroelectric phase transition in KH₂PO₄ have been studied by X-ray diffraction. Intensities of the (6, 6, 10) reflection which reflects motions of PO₄ tetrahedra, were measured and analyzed based on two models; and order-disorder model of PO₄ and a distorted-PO₄ model due to hydrogen orderings. It is suggested that PO₄ molecules undergo order-disorder motions at the ferroelectric phase transition in KH₂PO₄.

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Molecular motion of PO₄ in KDP at ferroelectric phase transition

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Molecular motion of PO4 in KDP at ferroelectric phase transition

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Molecular motion of PO₄ in KDP at ferroelectric phase transition