High resolution neutron and X-ray diffraction studies as a function of temperature and electric field of the ferroelectric phase transition of RDP

2004 ◽  
Vol 39 (12) ◽  
pp. 1027-1054 ◽  
Author(s):  
S. Mattauch ◽  
G. Heger ◽  
K. H. Michel
Keyword(s):  
Phase Transition ◽  
High Resolution ◽  
Electric Field ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
X Ray Diffraction ◽  
X Ray

Use of an External Electric Field to Convert the Paraelectric Phase to the Ferroelectric Phase in Ultra-thin Copolymer Films of P(VDF-TrFE)

2000 ◽  
Vol 655 ◽  
Author(s):  
Matt Poulsen ◽  
S. Adenwalla ◽  
Stephen Ducharme ◽  
V.M. Fridkin ◽  
S.P. Palto ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electric Field ◽  
External Electric Field ◽  
Ferroelectric Phase ◽  
Paraelectric Phase ◽  
Continuous Process ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
Layer Spacing ◽  
X Ray

AbstractX-ray diffraction was used to probe the structural changes associated with the conversion of the paraelectric phase to the ferroelectric phase that results from the application of a large external electric field. The samples under study are ultrathin (150 to 250 Å) Langmuir-Blodgett films of the copolymer vinylidene fluoride (70%) with trifluoroethylene (30%) deposited on aluminum-coated silicon. Theta-2theta X-ray diffraction was used to measure the change in inter-layer spacing perpendicular to the film surface. Upon heating at zero external electric field, the crystalline films undergo a structural phase transition, at 100± 5°C, from the all-trans ferroelectric phase to the trans-gauche paraelectric phase. [1,2] Above the phase transition temperature, the non-polar paraelectric phase can be converted back to the polar ferroelectric phase, in a smooth continuous process, using a large external electric field (∼1 GV/m). For example, at 100° C the ferroelectric phase first appears above 0.2 GV/m and increases steadily in proportion while the paraelectric phase decreases until complete conversion to the ferroelectric phase is achieved at approximately 0.6 GV/m.

Time-resolved X-ray diffraction study of the ferroelectric phase-transition in DKDP

2004 ◽  
Vol 299 (2-3) ◽  
pp. 157-161 ◽  
Author(s):  
J. Larsson ◽  
P. Sondhauss ◽  
O. Synnergren ◽  
M. Harbst ◽  
P.A. Heimann ◽  
...  
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray

scholarly journals Structural Study of Ferroelectric Phase Transition of Sn-doped SrTiO3

2014 ◽  
Vol 70 (a1) ◽  
pp. C61-C61 ◽  
Author(s):  
Hirofumi Kasatani ◽  
Shoichiro Suzuki ◽  
Akira Ando ◽  
Eisuke Magome ◽  
Chikako Moriyoshi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Local Structure ◽  
Ferroelectric Phase Transition ◽  
Nearest Neighbor ◽  
Ferroelectric Phase ◽  
Rietveld Analysis ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray

Recently, ferroelectricity was discovered in Sn-doped SrTiO3 (abbreviated by SSTO), in which Sr-atom was substituted by a few percent Sn-atom[1]. The ferroelctricity of SSTO was confirmed by means of the appearance of the dielectric anomaly, that reached several thousands and the clear D-E hysteresis loop in low temperature phase. In order to clarify the mechanism of ferroelectric phase transition of SSTO from the viewpoint of the crystal structure, we investigated the average crystal structure and the local structure around the substitutional Sn-atom of SSTO10 (10% Sn concentration, ferroelectric phase transition temperature 180K) by means of synchrotron-radiation powder X-ray diffraction and transmission XAFS spectrum of Sn:K-edge, respectively. From the results of MEM/Rietveld analysis of powder X-ray diffraction data, it was obtained that crystal structure of paraelectric phase of SSTO10 was cubic perovskite structure with the disorder state of Sn-atom. In ferroelectric phase, the crystal system was tetragonal, which was similar in structure to tetragonal ferroelectric structure of BaTiO3, and Sn-atom was order state. XAFS study revealed that the valence of Sn-ion was +2 charge and the local structure of Sn-atom was seemed as being the self-insistent state of SnO crystal structure. However, strangely, the coordination number of the nearest neighbor atom, that is O-atom, was 2 instead of 4. This is a mystery result and we have been analyzing. We have considered that the ferroelectricity of SSTO is induced by the distortion around the subsitituional Sn-atom. At the meeting, we are planning to discuss the precise crystal structure and the mechanism of the ferroelectric phase transition of SSTO.

Powder X-ray diffraction study of ferroelectric phase transition in perovskite oxide CdTiO3

2001 ◽  
Vol 259 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Yue Jin Shan ◽  
Hajime Mori ◽  
Ruiping Wang ◽  
Weiling Luan ◽  
Hideo Imoto ◽  
...  
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Perovskite Oxide ◽  
X Ray Diffraction ◽  
X Ray

In situ x‐ray diffraction study of the antiferroelectric–ferroelectric phase transition in PLSnZT

1996 ◽  
Vol 68 (21) ◽  
pp. 2942-2944 ◽  
Author(s):  
C. T. Blue ◽  
J. C. Hicks ◽  
S.‐E. Park ◽  
S. Yoshikawa ◽  
L. E. Cross
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Mechanisms of the paraelectric to ferroelectric phase transition in RbH2PO4probed by purely resonant x-ray diffraction

2014 ◽  
Vol 89 (9) ◽  
Author(s):  
C. Richter ◽  
D. V. Novikov ◽  
E. Kh. Mukhamedzhanov ◽  
M. M. Borisov ◽  
K. A. Akimova ◽  
...  
Keyword(s):  
Phase Transition ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
X Ray Diffraction ◽  
X Ray

X-Ray Diffraction Study of Pressure-Induced Ferroelectric Phase Transition in Relaxor-Pb(In1/2Nb1/2)O3

1999 ◽  
Vol 68 (1) ◽  
pp. 39-42 ◽  
Author(s):  
Kenji Nomura ◽  
Tetsuo Shingai ◽  
Shin-ichirou Ishino ◽  
Hikaru Terauchi ◽  
Naohiko Yasuda ◽  
...  
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
X Ray Diffraction ◽  
X Ray

Study of the ferroelectric phase transition of TlGaSe2 by dielectric, calorimetric, infrared and X-ray diffraction measurements

1988 ◽  
Vol 73 (2) ◽  
pp. 257-263 ◽  
Author(s):  
H. D. Hochheimer ◽  
E. Gmelin ◽  
W. Bauhofer ◽  
Ch. von Schnering-Schwarz ◽  
H. G. von Schnering ◽  
...  
Keyword(s):  
Phase Transition ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
X Ray Diffraction ◽  
X Ray
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