On Anomalous Influence of an External Electric Field on a Second-Order Transition in a Thin Ferroelectric Film

2020 ◽  
Vol 62 (4) ◽  
pp. 653-659
Author(s):  
V. N. Nechaev ◽  
A. V. Shuba
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Second Order ◽  
Ferroelectric Film ◽  
Order Transition ◽  
Thin Ferroelectric Film ◽  
Second Order Transition

NMR · NQR and DTA · DSC Studies of Phase Transitions in Pyridinium Tetrachloropalladate(II) and Pyridinium Tetrachloroplatinate(II)

1998 ◽  
Vol 53 (6-7) ◽  
pp. 419-426 ◽  
Author(s):  
Tetsuo Asaji ◽  
Keizo Horiuchi ◽  
Takehiko Chiba ◽  
Takashige Shimizu ◽  
Ryuichi Ikeda
Keyword(s):  
Phase Transitions ◽  
Low Temperatures ◽  
Structural Phase ◽  
Orientational Order ◽  
Second Order ◽  
Order Transition ◽  
Spin Lattice Relaxation ◽  
Potential Wells ◽  
H Nmr ◽  
Second Order Transition

Abstract From the measurements of DTA • DSC and the temperature dependences of 35Cl NQR frequencies, phase transitions were detected at 150 K, 168 K, and 172 K for (pyH)2 [PtCl4], and at 241 K for (PyH)2 [PdCl4]. In order to elucidate the motional state of the constituent ions in the crystals in connection with the structural phase transitions, the 35Cl NQR and 1H NMR spin-lattice relaxation times and the second moment of the 1H NMR line were measured as functions of temperature. For both compounds, the potential wells for the cationic reorientation are suggested to be highly nonequivalent at low temperatures. Above 168 K, the pyridinium ions in (pyH)2[PtCl4] are expected to reorient between almost equivalent potential wells. As for (pyH)2[PdCl4], it is expected that the orientational order of the cation still remains even above the second order transition at 241 K. A change of the potential curve from two-unequal to three-unequal wells is proposed as a possible mechanism of the second order transition. The activation energies for the cationic motion in the respective model potential are derived for both compounds at high and low temperatures.

scholarly journals In situ observation of atomic movement in a ferroelectric film under an external electric field and stress

Nano Research ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 3824-3832
Author(s):  
Hyeon Jun Lee ◽  
Er-Jia Guo ◽  
Taewon Min ◽  
Seung Hyun Hwang ◽  
Su Yong Lee ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Ferroelectric Film ◽  
In Situ Observation
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