scholarly journals High temperature phase stability in Li0.12Na0.88NbO3: A combined powder X-ray and neutron diffraction study

2015 ◽  
Vol 118 (9) ◽  
pp. 094101 ◽  
Author(s):  
S. K. Mishra ◽  
P. S. R. Krishna ◽  
A. B. Shinde ◽  
V. B. Jayakrishnan ◽  
R. Mittal ◽  
...  
Keyword(s):  
High Temperature ◽  
Neutron Diffraction ◽  
Diffraction Study ◽  
Phase Stability ◽  
Neutron Diffraction Study ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
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.

Neutron diffraction study of the orthorhombic low-temperature phase of N2D7I and X-ray investigations of the tetragonal and orthorhombic phases of N2H7I

1993 ◽  
Vol 203 (2) ◽  
Author(s):  
H. J. Berthold ◽  
E. Vonholdt ◽  
R. Wartchow ◽  
T. Vogt
Keyword(s):  
Low Temperature ◽  
Neutron Diffraction ◽  
Diffraction Study ◽  
Tetragonal Phase ◽  
Orthorhombic Phase ◽  
Neutron Diffraction Study ◽  
Temperature Phase ◽  
X Ray ◽  
Low Temperature Phase

AbstractNThe structure of the orthorhombic phase of NThe orthorhombic phase of NThe orthorhombic phase of NThe structure of the tetragonal phase observed only with N

High-temperature phase transitions in CsH2PO4 under ambient and high-pressure conditions: A synchrotron x-ray diffraction study

2007 ◽  
Vol 127 (19) ◽  
pp. 194701 ◽  
Author(s):  
Cristian E. Botez ◽  
Juan D. Hermosillo ◽  
Jianzhong Zhang ◽  
Jiang Qian ◽  
Yusheng Zhao ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature ◽  
Diffraction Study ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray
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