Phase transitions in single-crystalline polymerizing diacetylenes as seen by dielectric measurements

2007 ◽  
pp. 163-166
Author(s):  
M. Orczyk ◽  
J. Sworakowski
Keyword(s):  
Phase Transitions ◽  
Dielectric Measurements ◽  
Single Crystalline

Successive phase transitions in single-crystalline (C2H5NH3)2CuCl4 and potential of multiferroicity

2019 ◽  
Vol 290 ◽  
pp. 49-54
Author(s):  
Tatsuhiro Sakami ◽  
Toshihiro Ohtani ◽  
Yasuhiro Matsumoto ◽  
Daito Ochi ◽  
Xiaojuan Xi ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Single Crystalline ◽  
Successive Phase

Differential Thermal Analysis and Dielectric Studies on Neopentanol under Pressure

1992 ◽  
Vol 47 (11) ◽  
pp. 1127-1134 ◽  
Author(s):  
H. G. Kreul ◽  
R. Waldinger ◽  
A. Würflinger
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Relaxation Time ◽  
Phase Transitions ◽  
Dielectric Relaxation ◽  
Pressure Dependence ◽  
Dielectric Relaxation Time ◽  
Dielectric Studies ◽  
Dielectric Measurements ◽  
Plastic Phase

Abstract Differential thermal analysis (DTA) and dielectric measurements have been performed on 2,2-dimethyl- 1-propanol (neopentanol) up to 200 MPa. Neopentanol exhibits at least one orientationally disordered (ODIC) phase (solid I) that transforms at lower temperatures to a non-plastic phase (solid II). There is evidence of a further ODIC phase denoted as solid I'. The pressure dependence of the phase transitions and the dielectric behaviour up to frequencies of 13 MHz are described. Activation enthalpies and volumes are derived from the dielectric relaxation time and compared with results for other alcohols

Raman Scattering Studies of the Structural Phase Transitions in Single-Crystalline CH3NH3PbCl3

2020 ◽  
Vol 11 (10) ◽  
pp. 3773-3781
Author(s):  
Trang Thi Thu Nguyen ◽  
Yejin Kim ◽  
Soungmin Bae ◽  
Maryam Bari ◽  
Hye Ri Jung ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Raman Scattering ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Single Crystalline

High-pressure Raman and Brillouin studies of single crystalline gas hydrates

2003 ◽  
Vol 81 (1-2) ◽  
pp. 127-133 ◽  
Author(s):  
H Shimizu
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Brillouin Scattering ◽  
Low Frequency ◽  
Visual Observation ◽  
Cage Structure ◽  
Two Phase ◽  
Single Crystalline ◽  
Open Structures ◽  
Diamond Anvil

Methane hydrate (MH) and argon hydrate (AH) single crystals were synthesized in a diamond anvil cell to investigate their intrinsic high-pressure properties by visual observation and in situ Raman and Brillouin-scattering measurements. Single crystalline MH shows clearly two phase transitions at P =0.9 and 1.9 GPa in its crystalline shape and state under a microscope, and in the change in its Raman spectra of C–H stretching vibrations of guest CH4 molecules. The first determination of the elastic properties in MH sI phase has revealed that MH is about 10% softer than the most common ice Ih, which is accounted for by MH's void-rich and open structures. For a single-crystal AH, we have observed two phase transitions from AH-I (sII) to AH-II at about P =0.65 GPa and from AH-II to AH-III at P =1.02 GPa. The breakdown of the cage structure in AH-III was confirmed by the disappearance of the O–H stretching mode of host H2O lattices. The possibility of Ar double occupancy in the large cages of sII and higher pressure phases is investigated by the low-frequency Raman peak observed around 120 ~ 140 cm–1 in view of recent MD calculations. PACS Nos.: 62.30+d, 62.50+p, 62.65+k, 64.70-p, 78.30-j, 78.35+c

Multiple Phase Transitions of Single Crystalline CeGa2

1988 ◽  
Vol 57 (4) ◽  
pp. 1377-1383 ◽  
Author(s):  
Masahiko Takahashi ◽  
Hideyuki Tanaka ◽  
Takeo Satoh ◽  
Masahumi Kohgi ◽  
Yoshikazu Ishikawa ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Single Crystalline ◽  
Multiple Phase
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