Temperature-Jump Time-Resolved X-ray Diffraction Study of Cubic−Cubic Phase-Transition Kinetics in Thermotropic Cubic Mesogen 1,2-Bis(4′-n-alkoxybenzoyl)hydrazines (BABH-n)

Langmuir ◽  
2010 ◽  
Vol 26 (14) ◽  
pp. 11605-11608 ◽  
Author(s):  
Hiroyuki Mori ◽  
Shoichi Kutsumizu ◽  
Kazuya Saito ◽  
Katsuhiro Yamamoto ◽  
Shinichi Sakurai ◽  
...  
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
Temperature Jump ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Jump Time ◽  
Phase Transition Kinetics

A Pressure-Jump Time-Resolved X-ray Diffraction Study of Cubic−Cubic Transition Kinetics in Monoolein

Langmuir ◽  
2008 ◽  
Vol 24 (6) ◽  
pp. 2331-2340 ◽  
Author(s):  
Charlotte E. Conn ◽  
Oscar Ces ◽  
Adam M. Squires ◽  
Xavier Mulet ◽  
Roland Winter ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Pressure Jump ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Jump Time

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

High-temperature single-crystal X-ray diffraction study of tetragonal and cubic perovskite-type PbTiO3phases

2016 ◽  
Vol 72 (3) ◽  
pp. 381-388 ◽  
Author(s):  
Akira Yoshiasa ◽  
Tomotaka Nakatani ◽  
Akihiko Nakatsuka ◽  
Maki Okube ◽  
Kazumasa Sugiyama ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Single Crystal ◽  
Diffraction Study ◽  
Relative Displacement ◽  
High Temperature Phase ◽  
Cubic Phase ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray

A high-temperature single-crystal X-ray diffraction study of a synthetic PbTiO3perovskite was carried out over the wide temperature range 298–928 K. A transition from a tetragonal (P4mm) to a cubic (Pm \bar 3 m) phase has been revealed near 753 K. In the non-centrosymmetricP4mmsymmetry group, the difference in relative displacement between Pb and O along thec-axis is much larger than that between Ti and O. The Pb and Ti cations contribute sufficiently to polarization being shifted in the opposite direction compared with the shift of O atoms. Deviation from the linear changes in Debye–Waller factors and bonding distances in the tetragonal phases can be interpreted as a precursor phenomenon before the phase transition. Disturbance of the temperature factorUeqfor O is observed in the vicinity of the transition point, whileUeqvalues for Pb and Ti are continuously changing with increasing temperature. The O site includes the clear configurational disorder in the cubic phase. The polar local positional distortions remain in the cubic phase and are regarded as the cause of the paraelectricity. Estimated values of the Debye temperature ΘDfor Pb and Ti are 154 and 467 K in the tetragonal phase and decrease 22% in the high-temperature phase. Effective potentials for Pb and Ti change significantly and become soft after the phase transition.

Sign in / Sign up

Export Citation Format

Share Document