Electric Field Induced Phase Transition in KDP Crystal Near Curie Point: Raman and X-ray Scattering Studies
Varela, A. T. · Sasaki, J. M. · Guedes, I. · Freire, P. T. C. · Ayala, A. P. · Filho, J. Mendes · Melo, F. E. A. · Chaves, A. S.
Original · EN
X-ray scattering measurements are performed in order to verify % that the mechanism leading to the DC electric field induced C₂ᵥ¹⁹ → C₂ᵥ≠ ¹⁹ phase transition in KDP crystal at 119 K is the changing of the local sites symmetries of phosphate group from C₂ in the C₂ᵥ¹⁹ phase to Cₛ in the C₂ᵥ≠ ¹⁹ phase. It is shown by analyzing the integrated intensity of the (800) and (080) reflections that under DC electric field the density of oxygen atoms lying on these plane changes indicating that phosphate group rotates around the [010] direction relative to the orthorhombic C₂ᵥ¹⁹ structure. Some Raman results are also discussed.
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