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

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 Schottky anomaly and Néel temperature treatment of possible perturbed hydrogenated AA-stacked graphene, SiC, and h-BN bilayers

RSC Advances ◽  
2019 ◽  
Vol 9 (71) ◽  
pp. 41569-41580 ◽  
Author(s):  
Bui D. Hoi ◽  
Le T. T. Phuong ◽  
Vo T. Lam ◽  
Doan Q. Khoa ◽  
Tran Tien ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Heat Capacity ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Temperature Treatment ◽  
Electronic Heat Capacity ◽  
Néel Temperature ◽  
Schottky Anomaly ◽  
Electronic Heat ◽  
Pauli Susceptibility

The potential of manipulating the electronic heat capacity and Pauli susceptibility of hydrogenated AA-stacked graphene, silicon carbide, and hexagonal boron nitride bilayers is studied.

scholarly journals Thermodynamic Functions of Terbium Hafnate

2021 ◽  
Vol 66 (6) ◽  
pp. 861-867
Author(s):  
A. V. Guskov ◽  
P. G. Gagarin ◽  
V. N. Guskov ◽  
A. V. Tyurin ◽  
A. V. Khoroshilov ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermodynamic Functions ◽  
Adiabatic Calorimetry ◽  
Molar Heat Capacity ◽  
Pyrochlore Structure ◽  
Schottky Anomaly ◽  
Temperature Range

Abstract The molar heat capacity of terbium hafnate with a pyrochlore structure was measured by relaxation and adiabatic calorimetry. The smoothed values of the molar heat capacity were used to calculate the thermodynamic functions in the temperature range 6–330 K. The general form of the Schottky anomaly was determined.

Low-temperature heat capacity and thermodynamic functions of thulium and lutetium titanates and Schottky anomaly in Tm2Ti2O7

2022 ◽  
Vol 165 ◽  
pp. 106646
Author(s):  
Mira R. Bissengaliyeva ◽  
Alexander V. Knyazev ◽  
Michael A. Bespyatov ◽  
Daniil B. Gogol ◽  
Shynar T. Taimassova ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Low Temperature ◽  
Thermodynamic Functions ◽  
Schottky Anomaly ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity

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.

MAGNETIZATION DEPENDENCE OF PHONON EFFECT ON VOLUME OF AN ITINERANT ELECTRON FERROMAGNET

1993 ◽  
Vol 07 (01n03) ◽  
pp. 695-698
Author(s):  
Masao OSHIMA ◽  
Nobuhiro HAMAGUCHI ◽  
Shinji FUKUMOTO ◽  
D.J. KIM
Keyword(s):  
Numerical Calculation ◽  
Anomalous Behavior ◽  
Itinerant Electron ◽  
Phonon Interaction ◽  
Electronic Density ◽  
Electron Phonon Interaction ◽  
Temperature Dependences ◽  
Magnetization Dependence ◽  
Grüneisen Constant

Volume behavior is often anomalous for T<Tc of an itinerant electron ferromagnet. Recently Kim pointed out that phonons also can be responsible for such anomalous behavior. Further to explore such possible role of phonons, in this paper we carry out a numerical calculation on the temperature dependences of phonon Debye temperature and Grüneisen constant of an itinerant electron ferromagnet by using a model electronic density of states. Our numerical results support our earlier conclusion and demonstrate the importance of taking into account the effect of the electron-phonon interaction in understanding the anomalous volume and elasticity behavior of an itinerant electron ferromagnet.

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