Ultrasonic Study of the Low Temperature Structural Phase Transition in Yba2Cu3O7-δ. and its Dependence on Oxygen Concentration

1989 ◽  
Vol 169 ◽  
Author(s):  
J. Toulouse ◽  
X.Q. Wang ◽  
D.J.L. Hong
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Linear Relationship ◽  
Oxygen Concentration ◽  
Structural Phase Transition ◽  
Annealing Temperature ◽  
Structural Phase ◽  
Structural Instability ◽  
Second Phase ◽  
Ultrasonic Study

AbstractElastic and structural instability have been reported in YBa2Cu3O7‐δbetween 210K and 270K. We have carried out an ultrasonic study of these instabilities as a function of both oxygen concentration and annealing temperature. The results strongly indicate that an athermal (martensitic‐type) transition starts at a temperature Ts which decreases with decreasing oxygen concentration. A linear relationship between Ts and Tc suggests that the second phase formed is essential for the high Tc.

Low-Temperature Structure (T = 235 K) and Structural Phase Transition in [(C2H5)4N]2SnCl6

1987 ◽  
Vol 103 (1) ◽  
pp. 73-78 ◽  
Author(s):  
H. Ketata ◽  
M. H. Ben Ghozlen ◽  
A. Daoud ◽  
I. Pabst
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Temperature Structure

Structural phase transition at low temperature in La2−x Sr x CuO4 aroundx=0.12 under magnetic fields

1996 ◽  
Vol 46 (S3) ◽  
pp. 1237-1238 ◽  
Author(s):  
Takao Suzuki ◽  
Kaichiro Chiba ◽  
Takayuki Goto ◽  
Tetsuo Fukase
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Magnetic Fields ◽  
Structural Phase Transition ◽  
Structural Phase

Ultrasonic Study of the Li-induced Structural Phase Transition in K 1− x Li x TaO 3

1993 ◽  
Vol 21 (3) ◽  
pp. 323-328 ◽  
Author(s):  
P Doussineau ◽  
Y Farssi ◽  
C Frénois ◽  
A Levelut ◽  
K McEnaney ◽  
...  
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Ultrasonic Study

Effects of partial substitution on Tc and low-temperature structural phase transition in La2−xBaxCuO4

1991 ◽  
Vol 185-189 ◽  
pp. 791-792 ◽  
Author(s):  
Yoji Koike ◽  
Tsutomu Kawaguchi ◽  
Syoichi Hosoya ◽  
Naoki Watanabe ◽  
Takahashi Noji ◽  
...  
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Partial Substitution

Low temperature frustrated structural phase transition in single crystal La1.85Sr0.15CuO4

1995 ◽  
Vol 197 (5-6) ◽  
pp. 439-443 ◽  
Author(s):  
Z.J. Yang ◽  
M. Yewondwossen ◽  
R.A. Dunlap ◽  
D.J.W. Geldart ◽  
S.L. Yuan ◽  
...  
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Single Crystal ◽  
Structural Phase Transition ◽  
Structural Phase

Phase Transitions and Water Dynamics of [Mn(H2O)6](ClO4 )2 Studied by Differential Scanning Calorimetry and Neutron Scattering Methods

2000 ◽  
Vol 55 (9-10) ◽  
pp. 759-764 ◽  
Author(s):  
E. Mikuli ◽  
A. Migdał-Mikuli ◽  
I. Natkaniec ◽  
J. Mayer
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Neutron Scattering ◽  
Structural Phase Transition ◽  
Room Temperature ◽  
Structural Phase ◽  
Water Dynamics ◽  
Water Molecules ◽  
Temperature Phase ◽  
Solid Phases

Abstract DSC measurements performed at 95 -290 K have shown that [Mn(H 2 O) 6 ](CIO 4) 2 possesses, besides a high-temperature phase, existing above 323 K, four low-temperature solid phases. The inelastic incoherent neutron scattering (IINS) spectra and neutron powder diffraction (NPD) pat-terns registered at 20 -290 K have supported the DSC results and provided evidence that the investigated substance possesses even more than five solid phases. The IINS spectra have shown that in the room-temperature phase, water molecules perform fast stochastic reorientation at the picosecond scale. The orientational disorder characteristic for the room-temperature phase can be easily overcooled and frozen. Even by relatively slow cooling at ca. 40 K/hour a metastable, orientational (protonic) glass phase is formed below ca. 160 K. Below ca. 100 K, a structural phase transition was observed by the NPD, however the IINS spectra indicate existence of the pure ordered low-temperature phase only after annealing the sample for a few hours at 100 K. On heating, a structural phase transition takes place at ca. 120 K, and at ca. 225 K water molecules begin fast reorientation.

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