High-temperature synchrotron X-ray powder diffraction study of the orthorhombic–tetragonal phase transition in lanthanum titanate perovskite La0.68(Ti0.95,Al0.05)O3

2002 ◽  
Vol 363 (1-2) ◽  
pp. 129-133 ◽  
Author(s):  
Masatomo Yashima ◽  
Roushown Ali ◽  
Masahiko Tanaka ◽  
Takeharu Mori
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Tetragonal Phase ◽  
X Ray ◽  
Lanthanum Titanate ◽  
Tetragonal Phase Transition

High-Temperature Synchrotron X-Ray Powder Diffraction Study of the Orthorhombic–Tetragonal Phase Transition in La0.63(Ti0.92,Nb0.08)O3

2002 ◽  
Vol 164 (1) ◽  
pp. 51-59 ◽  
Author(s):  
Roushown Ali ◽  
Masatomo Yashima ◽  
Masahiko Tanaka ◽  
Hideki Yoshioka ◽  
Takeharu Mori ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Tetragonal Phase ◽  
X Ray ◽  
Tetragonal Phase Transition

High-temperature X-ray powder diffraction study of the tetragonal-cubic phase transition in nanocrystalline, compositionally homogeneous ZrO2–CeO2 solid solutions

2008 ◽  
Vol 23 (S1) ◽  
pp. S70-S74 ◽  
Author(s):  
L. M. Acuña ◽  
R. O. Fuentes ◽  
D. G. Lamas ◽  
I. O. Fábregas ◽  
N. E. Walsöe de Reca ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
High Temperature ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Tetragonal Phase ◽  
Room Temperature ◽  
Cubic Phase ◽  
X Ray ◽  
First Order

Crystal structure of compositionally homogeneous, nanocrystalline ZrO2–CeO2 solutions was investigated by X-ray powder diffraction as a function of temperature for compositions between 50 and 65 mol % CeO2. ZrO2-50 and 60 mol % CeO2 solid solutions, which exhibit the t′-form of the tetragonal phase at room temperature, transform into the cubic phase in two steps: t′-to-t″ followed by t″-to-cubic. But the ZrO2-65 mol % CeO2, which exhibits the t″-form, transforms directly to the cubic phase. The results suggest that t′-to-t″ transition is of first order, but t″-to-cubic seems to be of second order.

Orthorhombic to tetragonal phase transition in the RBa2Cu3O7−δ system studied by in - situ X-ray powder diffraction measurements

1988 ◽  
Vol 23 (10) ◽  
pp. 1409-1415 ◽  
Author(s):  
Y. Ueda ◽  
A. Mitushima ◽  
H. Toda ◽  
N. Kojima ◽  
M. Yoshikawa ◽  
...  
Keyword(s):  
Phase Transition ◽  
Powder Diffraction ◽  
Tetragonal Phase ◽  
X Ray ◽  
Tetragonal Phase Transition

High-Temperature X-Ray Powder Diffraction Study on the Phase Transition between the α-Quartz and the β-Cristobalite-Like Phase of GaPO4

2000 ◽  
Vol 321-324 ◽  
pp. 914-917 ◽  
Author(s):  
P.M. Worsch ◽  
B. Koppelhuber-Bitschnau ◽  
F.A. Mautner ◽  
P.W. Krempl ◽  
W. Wallnöfer ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
X Ray

Investigation of orthorhombic–tetragonal structural crossover in (Ba0.92Ca0.08)(Zr0.05Ti0.95)O3

2014 ◽  
Vol 47 (5) ◽  
pp. 1647-1650 ◽  
Author(s):  
G. Singh ◽  
A. Upadhaya ◽  
A. K. Sinha ◽  
V. S. Tiwari
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Tetragonal Phase ◽  
Profile Analysis ◽  
Line Profile Analysis ◽  
Monoclinic Structure ◽  
Structural Refinement ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tetragonal Phase Transition

The orthorhombic to tetragonal phase transition in (Ba0.92Ca0.08)(Zr0.05Ti0.95)O3was investigated using high-temperature X-ray diffraction between 260 and 333 K. The results established the presence of tetragonal (P4mm) and orthorhombic (Amm2) phase co-existence in the temperature range of 293 ≤T≤ 313 K. The tetragonal phase was found to increase from 27% at 293 K to 76% at 313 K. The structural refinement and line-profile analysis ruled out the presence of an intermediate monoclinic structure duringP4mm→Amm2 crossover. The analysis shows a pure orthorhombic (Amm2) structure forT< 293 K and tetragonal forT> 313 K.

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