High-temperature calorimetry of zirconia: Heat capacity and thermodynamics of the monoclinic–tetragonal phase transition

2006 ◽  
Vol 38 (3) ◽  
pp. 211-223 ◽  
Author(s):  
Yosuke Moriya ◽  
Alexandra Navrotsky
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
High Temperature ◽  
Tetragonal Phase ◽  
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

THE HIGH TEMPERATURE RESISTIVITY OF Ba2YCu3O7−x

1988 ◽  
Vol 01 (09n10) ◽  
pp. 389-392 ◽  
Author(s):  
ZHANG XINGKUI ◽  
ZHU SHINING ◽  
WANG HAO ◽  
ZHANG SHIYUAN ◽  
YE SU ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Oxygen Evolution ◽  
Tetragonal Phase ◽  
Room Temperature ◽  
Drude Model ◽  
Temperature Resistivity ◽  
Derivative Thermogravimetry ◽  
Tetragonal Phase Transition

The high temperature resistivity (ρ), thermogravimetry (TG) and derivative thermogravimetry (DTG) have been used to characterize superconductor Ba2YCu3O7−x (BYCO) in O2, air and N2. The resistivity is linear from room temperature to 350°C and then deviate from linearity with oxygen evolution, the derivative of resistivity dρ/dT increases abruptly near orthorhombic to tetragonal phase transition. These phenomena can give good explanations for a two-band Drude model.

STRUCTURAL CHANGES OF Ni-DOPED YBCO AT DIFFERENT TEMPERATURE

2005 ◽  
Vol 19 (01n03) ◽  
pp. 319-322
Author(s):  
L. ZHANG ◽  
H. L. DU ◽  
X. F. RUI ◽  
X. F. SUN ◽  
H. ZHANG
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Tetragonal Phase ◽  
Room Temperature ◽  
Structural Changes ◽  
Close Correlation ◽  
Bond Lengths ◽  
Ni Content ◽  
The Difference ◽  
Tetragonal Phase Transition

In YBa 2 Cu 3-x Ni x O y at about 480°C all the samples show a tetragonal phase. Comparing the structural changes at 480°C with those at room temperature, the bond lengths such as Cu (1)- O (4) and Cu (2)- O (4) vary regularly with Ni -content increasing at room temperature, but not at high temperature. It suggests that there is a close correlation between structural changes and superconductivity in this system. The difference of orthorhombic- tetragonal phase -transition is also discussed between undoped YBCO and Ni -doped YBCO at high temperature.

Orthorhombic‐tetragonal phase transition in high‐temperature superconductor YBa2Cu3O7

1987 ◽  
Vol 51 (5) ◽  
pp. 367-368 ◽  
Author(s):  
M. O. Eatough ◽  
D. S. Ginley ◽  
B. Morosin ◽  
E. L. Venturini
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Tetragonal Phase ◽  
High Temperature Superconductor ◽  
Tetragonal Phase Transition
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