Differential thermal analysis (DTA) and dielectric studies of trans,trans-4'-n-heptyl-bicyclohexyl-4-carbonitrile under high pressure

1998 ◽  
Author(s):  
D. Buesing ◽  
T. Brueckert ◽  
A. Wuerflinger ◽  
B. Gestblom
Keyword(s):  
Thermal Analysis ◽  
High Pressure ◽  
Differential Thermal Analysis ◽  
Dielectric Studies

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

Differential Thermal Analysis of Rapid High Pressure Decompositions

1968 ◽  
Vol 1 (5) ◽  
pp. 285-288 ◽  
Author(s):  
E. J. Barrett ◽  
H. W. Hoyer ◽  
A. V. Santoro
Keyword(s):  
Thermal Analysis ◽  
High Pressure ◽  
Differential Thermal Analysis

Differential Thermal Analysis and Dielectric Studies on 2-Methyl-2-Nitro-Propane under High Pressure

1995 ◽  
Vol 50 (4-5) ◽  
pp. 502-504 ◽  
Author(s):  
D. Büsing ◽  
M. Jenau ◽  
J. Reuter ◽  
A. Würflinger ◽  
J. Li. Tamarit
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Temperature Phase ◽  
Dielectric Studies ◽  
Static Permittivity ◽  
Coexistence Region ◽  
Disordered Phase ◽  
Plastic Phase ◽  
Related Compounds ◽  
Low Temperature Phase

Abstract Differential thermal analysis and dielectric studies under pressures up to 300 MPa and temperatures of about 200 to 350 K have been performed on 2-methyl-2-nitro-propane (TBN). TBN displays an orientationally disordered phase (ODIC), solid I, and two non-plastic phases, solids II and III. The coexistence region of the plastic phase I increases with increasing pressure, whereas the low-temperature phase II apparently vanishes at a triple point I, II, III, above 300 MPa. The static permittivity increases on freezing, characterizing the solid I as an ODIC phase. In the frame of the Kirkwood-Onsager-Fröhlich theory the g-factor is about unity, discounting specific dielectric correlations. The dielectric behaviour of TBN is similar to previously studied related compounds, such as 2-chloro-2-methyl-propane or 2-brome- 2-methyl-propane

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