Anomalous behavior of liquid K–Pb alloys: Excess stability, entropy, and heat capacity

1986 ◽  
Vol 85 (10) ◽  
pp. 6072-6081 ◽  
Author(s):  
Marie‐Louise Saboungi ◽  
Susan R. Leonard ◽  
Julie Ellefson
Keyword(s):  
Heat Capacity ◽  
Anomalous Behavior ◽  
Excess Stability

scholarly journals Correction to “Anomalous Behavior of Heat Capacity in Ni2(bdc)2(dabco). Schottky Anomaly and Spin–Phonon Interaction”

2021 ◽  
Vol 125 (8) ◽  
pp. 4924-4925
Author(s):  
Svetlana G. Kozlova ◽  
Denis P. Pishchur ◽  
Nikolay B. Kompankov ◽  
Vladimir R. Shayapov ◽  
Denis G. Samsonenko
Keyword(s):  
Heat Capacity ◽  
Anomalous Behavior ◽  
Phonon Interaction ◽  
Schottky Anomaly

scholarly journals Understanding the abnormal thermal behavior of nanofluids through infrared thermography and thermo-physical characterization

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Adela Svobodova-Sedlackova ◽  
Alejandro Calderón ◽  
Camila Barreneche ◽  
Pablo Gamallo ◽  
A. Inés Fernández
Keyword(s):  
Heat Capacity ◽  
Infrared Thermography ◽  
Base Material ◽  
Colloidal Suspensions ◽  
Anomalous Behavior ◽  
Ionic Exchange ◽  
Kapitza Resistance ◽  
Scanning Calorimetry ◽  
Abnormal Increase ◽  
Thermal Energy Storage Systems

AbstractNanofluids (NFs) are colloidal suspensions of nanoparticles (NPs) within a base fluid. Unlike conventional mixtures, NFs exhibit dramatically enhanced properties, such as an abnormal increase in heat capacity at low concentration of NPs (e.g., Cp values 30% higher than the base material value). Understanding the thermo-physical behavior of NFs is essential for their application as thermal energy storage systems. In this study, we analyze a sodium nitrate ionic system containing 1 wt%, 3 wt% and 7 wt% of SiO2 NPs with different techniques like infrared thermography, infrared spectroscopy and differential scanning calorimetry (DSC) in order to shed light on the mechanism behind the increase of Cp. The themographies reveal the presence of a colder layer on top of the NF with 1 wt% of NPs whereas this layer does not appear at higher concentrations of NPs. The IR spectrum of this foamy top layer evidences the high amount of SiO2 bonds suggesting the clustering of the NPs into this layer linked by the nitrate ions. The linking is enhanced by the presence of hydroxyls in the NPs’ surface (i.e., hydroxilated NPs) that once mixed in the NF suffer ionic exchange between OH− and NO3− species, leading to O2–Si–O–NO2 species at the interface where a thermal boundary resistance or Kapitza resistance appears (RT = 2.2 m2 K kW−1). Moreover, the presence of an exothermic reactive processes in the calorimetry of the mixture with 1 wt% of NPs evidences a reactive process (ionic exchange). These factors contribute to the heat capacity increase and thus, they explain the anomalous behavior of the heat capacity in nanofluids.

scholarly journals The low temperature heat capacity of Li2Mo0.05W0.95O4

2021 ◽  
Vol 2119 (1) ◽  
pp. 012137
Author(s):  
A E Musikhin ◽  
M A Bespyatov ◽  
T M Kuzin ◽  
V D Grigorieva ◽  
V N Shlegel
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Low Temperature ◽  
Thermodynamic Functions ◽  
Anomalous Behavior ◽  
Zero Temperature ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity ◽  
Lithium Tungstate ◽  
Heat Capacity Function

Abstract The heat capacity of a lithium tungstate single crystal doped by 5% molybdenum Li2Mo0.05W0.95O4 in the range of 78.5–302.8 K was measured by the adiabatic method. No anomalous behavior of heat capacity was found. The heat capacity function was obtained in the range of 0–303 K by extrapolating to zero temperature and fitting experimental points. Thermodynamic functions of entropy, enthalpy increment and Gibbs free energy at 298.15 K were calculated using the obtained data.

Anomalous Behavior of Heat Capacity in Ni2(bdc)2(dabco). Schottky Anomaly and Spin–Phonon Interaction

2020 ◽  
Vol 124 (37) ◽  
pp. 20222-20227
Author(s):  
Svetlana G. Kozlova ◽  
Denis P. Pishchur ◽  
Nikolay B. Kompankov ◽  
Vladimir R. Shayapov ◽  
Denis G. Samsonenko
Keyword(s):  
Heat Capacity ◽  
Anomalous Behavior ◽  
Phonon Interaction ◽  
Schottky Anomaly

scholarly journals STUDY ON UNCONVENTIONAL SUPERCONDUCTORS VIA ANGLE-RESOLVED SPECIFIC HEAT

2004 ◽  
Vol 18 (24) ◽  
pp. 1205-1223 ◽  
Author(s):  
TUSON PARK ◽  
M. B. SALAMON
Keyword(s):  
Heat Capacity ◽  
Momentum Space ◽  
Quantitative Agreement ◽  
Anomalous Behavior ◽  
Superconducting Transition ◽  
Electronic Excitations ◽  
Nonlocal Effects ◽  
Unconventional Superconductors ◽  
Disorder Effects ◽  
Doppler Shifts

The gap function in unconventional superconductors may vanish at points or lines in momentum space, permitting electronic excitations, termed "nodal quasiparticles", to exist at temperatures well below the superconducting transition. In the vortex phase, the presence of nodal quasiparticles should be directly observable through the variation of the heat capacity with the angle between a magnetic field and the location of the zeroes of the gap. The heat capacity of candidate nonmagnetic unconventional superconductors Lu ( Y ) Ni 2 B 2 C were found to exhibit fourfold oscillations with field angle, the first such observation. The observed angular variations are in quantitative agreement with theory, confirming that quasiparticles are created via Doppler shifts at nodes along <100>. Anomalous disorder effects have been also observed in the field-angle-dependent heat capacity Cp(α). In a slightly disordered sample, anomalous secondary minima along <110> appeared for μ0H>1 T , leading to an eightfold pattern. The coexistence of an anisotropic superconducting gap and nonlocal effects is shown to drive the anomalous behavior. These results demonstrate that field-angle-dependent heat capacity can be a powerful tool in probing the momentum-space gap structure in unconventional superconductors such as high-Tc cuprates, heavy fermions, borocarbides, etc.

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

HEAT CAPACITY OF NEODYMIUM BELOW 10 K

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-794-C6-795 ◽  
Author(s):  
E. M. Forgan ◽  
C. M. Muirhead
Keyword(s):  
Heat Capacity
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