TY - JOUR
T1 - Kinetics of the field induced commensurate to ferro-electric phase transition in thiourea
AU - Liss, K. D.
AU - Kaiser, M.
AU - Hlinka, J.
AU - Denoyer, F.
AU - Hock, R.
AU - Currat, R.
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2003/5/21
Y1 - 2003/5/21
N2 - The paper examines the kinetics of the electric field induced, first-order transition from the commensurate to the ferro-electric phase in thiourea (SC(NH2)2) at 170 K. The satellite reflection from the modulated phase, locked in with a wave vector q = 1/9b* disappears when the phase transition is induced by a static electric field Ec along the a-axis. In order to study the kinetics of the phase transition, an oscillating electric voltage of rectangular shape was applied to the sample and photon events were acquired separately for ON- and OFF-field half-periods. Results received in a series of measurements at different amplitudes between 0 and 500 V and frequencies between 0.125 and 512 Hz lead to the conclusion that a slow and a fast relaxation time play a role for the OFF → ON and the ON → OFF transitions, respectively. Further, the highest frequency at which the phase transformation still follows the switching of the electric field depends linearly on the applied field amplitude. A qualitative explanation of the experimental results is given in terms of nucleation and growth of specific ferro-electric domains.
AB - The paper examines the kinetics of the electric field induced, first-order transition from the commensurate to the ferro-electric phase in thiourea (SC(NH2)2) at 170 K. The satellite reflection from the modulated phase, locked in with a wave vector q = 1/9b* disappears when the phase transition is induced by a static electric field Ec along the a-axis. In order to study the kinetics of the phase transition, an oscillating electric voltage of rectangular shape was applied to the sample and photon events were acquired separately for ON- and OFF-field half-periods. Results received in a series of measurements at different amplitudes between 0 and 500 V and frequencies between 0.125 and 512 Hz lead to the conclusion that a slow and a fast relaxation time play a role for the OFF → ON and the ON → OFF transitions, respectively. Further, the highest frequency at which the phase transformation still follows the switching of the electric field depends linearly on the applied field amplitude. A qualitative explanation of the experimental results is given in terms of nucleation and growth of specific ferro-electric domains.
UR - http://www.scopus.com/inward/record.url?scp=0038282874&partnerID=8YFLogxK
U2 - 10.1088/0022-3727/36/10A/335
DO - 10.1088/0022-3727/36/10A/335
M3 - 文章
AN - SCOPUS:0038282874
VL - 36
SP - A172-A176
JO - Journal Physics D: Applied Physics
JF - Journal Physics D: Applied Physics
SN - 0022-3727
IS - 10 A
ER -