Rotational freedom of guest molecules in tetrahydrofuran clathrate hydrate, as determined by heat capacity measurements

1985 ◽  
Vol 89 (8) ◽  
pp. 1380-1383 ◽  
Author(s):  
Mary Anne White ◽  
Mark T. MacLean
Keyword(s):  
Heat Capacity ◽  
Clathrate Hydrate ◽  
Guest Molecules ◽  
Heat Capacity Measurements ◽  
Rotational Freedom

Clathrate and other solid phases in the tetrahydrofuran–water system: thermal conductivity and heat capacity under pressure

1982 ◽  
Vol 60 (7) ◽  
pp. 881-892 ◽  
Author(s):  
Russell G. Ross ◽  
Per Andersson
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Water System ◽  
Clathrate Hydrate ◽  
Transient Hot Wire ◽  
Guest Molecules ◽  
Hydrate Phase ◽  
Wire Method ◽  
Solid Phases ◽  
Thermal Conductivity Λ

Solid phases in the tetrahydrofuran–water (THF–H2O) system were investigated in the temperature range 100–260 K and at pressures up to 1.5 GPa. Thermal conductivity, λ, and heat capacity per unit volume, ρcp, were measured, using the transient hot-wire method. We made measurements on solid phases having nominal compositions THF•17H2O, THF•7•1H2O, and THF•4•6H2O, which we refer to as phases α, β, and γ, respectively. Phase α is known to be a structure II clathrate hydrate, and λ for this phase was found to be similar to other crystalline solids which are glass-like in relation to their thermal properties. Low-energy excitations are known to be relevant to the properties of glass-like solids, and, in the case of phase α, were probably rotational vibrations of the THF guest molecules. Phase β was similar, and we inferred that it was probably a structure I clathrate hydrate. Phase γ behaved nearly like a normal crystal phase at low temperatures, but λ became almost independent of temperature near melting. At 1.1 GPa and 130 K, we found evidence that phase α transformed, on pressurization, to a metastable modification which may be a new high-density form of clathrate hydrate. The astrophysical implications of our results were mentioned briefly.

HEAT CAPACITY MEASUREMENTS ON THE DILUTED ISING SYSTEM Cs3CopZn1-pCl5

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-1008-C1-1009 ◽  
Author(s):  
E. LAGENDIJK ◽  
W. J. HUISKAMP ◽  
P. F. BONGERS
Keyword(s):  
Heat Capacity ◽  
Ising System ◽  
Heat Capacity Measurements

Carbon and thick film chip resistors as thermometers for heat capacity measurements below 1 K

Cryogenics ◽  
1991 ◽  
Vol 31 (9) ◽  
pp. 796-800 ◽  
Author(s):  
M.L. Siqueira ◽  
R.J. Viana ◽  
R.E. Rapp
Keyword(s):  
Heat Capacity ◽  
Thick Film ◽  
Heat Capacity Measurements

Studies on rhenium (Re) solubility and heat capacity measurements onCa10-xRex(PO4)6(OH)2±δ, x= 0 to 0.7for radwaste immobilization

2021 ◽  
Vol 696 ◽  
pp. 178824
Author(s):  
L. Shirley Auxilia ◽  
Hrudananda Jena ◽  
Abhiram Senapati ◽  
R. Sudha
Keyword(s):  
Heat Capacity ◽  
Heat Capacity Measurements

The heat capacity measurements of CoSb3-based Skutterudite compounds

2010 ◽  
Vol 101 (6) ◽  
pp. 808-811 ◽  
Author(s):  
Yubi Zhang ◽  
Changrong Li ◽  
Guiying Xu ◽  
Zhenmin Du ◽  
Cuiping Guo ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Heat Capacity Measurements

An automated adiabatic calorimeter for heat-capacity measurements between 20 and 90 K

1988 ◽  
Vol 123 ◽  
pp. 105-111 ◽  
Author(s):  
Tan Zhicheng ◽  
Yin Anxue ◽  
Chen Shuxia ◽  
Zhou Lixing ◽  
Li Fuxue ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Adiabatic Calorimeter ◽  
Heat Capacity Measurements

Heat capacity measurements on Sn2S3 and the thermodynamic functions of the tin sulfides

1980 ◽  
Vol 35 (2) ◽  
pp. 187-196 ◽  
Author(s):  
Heribert Wiedemeier ◽  
Frank Csillag ◽  
Umesh Gaur ◽  
Bernhard Wunderlich
Keyword(s):  
Heat Capacity ◽  
Thermodynamic Functions ◽  
Tin Sulfides ◽  
Heat Capacity Measurements

scholarly journals Heat capacity measurements on FeAs-based compounds: a thermodynamic probe of electronic and magnetic states

2009 ◽  
Vol 11 (2) ◽  
pp. 025010 ◽  
Author(s):  
P J Baker ◽  
S R Giblin ◽  
F L Pratt ◽  
R H Liu ◽  
G Wu ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Heat Capacity Measurements ◽  
Magnetic States
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