Low Temperature Behavior of Heat Capacity and Thermal Conductivity in Crystalline Ferroelectric Materials

1985 ◽  
Vol 24 (S2) ◽  
pp. 975 ◽  
Author(s):  
J. J. De Yoreo ◽  
R. O. Pohl ◽  
Gerald Burns
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Low Temperature ◽  
Ferroelectric Materials ◽  
Temperature Behavior

Low-temperature transport properties of polycrystalline Ba8Ga16Sn30

2004 ◽  
Vol 19 (12) ◽  
pp. 3556-3559 ◽  
Author(s):  
G.S. Nolas ◽  
J.L. Cohn ◽  
J.S. Dyck ◽  
C. Uher ◽  
G.A. Lamberton ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Phase Space ◽  
Low Temperature ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Type Viii ◽  
Heat Capacity Measurements ◽  
Temperature Resistivity ◽  
Semiconducting Behavior

Low-temperature resistivity, Seebeck coefficient, thermal conductivity, and heat-capacity measurements were performed on Ba8Ga16Sn30. This compound crystallizes in a cubic type-VIII clathrate phase, space group I¯43m, with the Baatoms residing inside voids created by a tetrahedrally bonded network of Ga andSn atoms. Ba8Ga16Sn30 exhibits semiconducting behavior above 150 K with a low thermal conductivity and thus may hold potential for thermoelectric applications.

Low Temperature Thermal Conductivity, Heat Capacity, and Heat Generation of PZT

1995 ◽  
Vol 6 (6) ◽  
pp. 757-764 ◽  
Author(s):  
Shridhar Yarlagadda ◽  
Moses H.W. Chan ◽  
Hyun Lee ◽  
George A. Lesieutre ◽  
David W. Jensen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Low Temperature ◽  
Heat Generation

Temperature Field Test and Numerical Simulation Research in Concrete under Cryogenic Temperature

2014 ◽  
Vol 687-691 ◽  
pp. 4415-4419 ◽  
Author(s):  
Ling Feng Li ◽  
Lu Hui Yan ◽  
Yu Wu Zhang
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Numerical Simulation ◽  
Heat Capacity ◽  
Temperature Field ◽  
Low Temperature ◽  
Field Test ◽  
Cryogenic Temperature ◽  
Test Results ◽  
Simulation Research

The mechanical properties of concrete under cryogenic temperature (-165°C) are affected by the temperature field inside the concrete. This paper presents assumptions by adjusting the formulas of thermal conductivity (λ) and specific heat capacity (C), respectively under low temperature. Through ABAQUS, we simulate the temperature downward-upward processes and compare them with the test results. Finally, the research gets more reasonable formulas of λ and C, respectively under cryogenic temperature.

The limiting low-temperature behavior of the heat capacity of graphite

1960 ◽  
Vol 13 (1-2) ◽  
pp. 160-163 ◽  
Author(s):  
P. Flubacher ◽  
A.J. Leadbetter ◽  
J.A. Morrison
Keyword(s):  
Heat Capacity ◽  
Low Temperature ◽  
Temperature Behavior

Low-temperature thermal conductivity and boson peak in the glassy g-As2S3

2016 ◽  
Vol 39 (0) ◽  
pp. 66-72
Author(s):  
В. Міца ◽  
О. Фегер ◽  
С. Петрецький ◽  
Р. Голомб ◽  
В. Ткач
Keyword(s):  
Thermal Conductivity ◽  
Low Temperature ◽  
Boson Peak

scholarly journals Influence of alkaline modification on selected properties of banana fiber paperbricks

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abayomi A. Akinwande ◽  
Adeolu A. Adediran ◽  
Oluwatosin A. Balogun ◽  
Oluwaseyi S. Olusoju ◽  
Olanrewaju S. Adesina
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Moisture Absorption ◽  
Water Volume ◽  
Banana Fiber ◽  
Fiber Loading ◽  
Banana Fibers ◽  
Alkaline Modification

AbstractIn a bid to develop paper bricks as alternative masonry units, unmodified banana fibers (UMBF) and alkaline (1 Molar aqueous sodium hydroxide) modified banana fibers (AMBF), fine sand, and ordinary Portland cement were blended with waste paper pulp. The fibers were introduced in varying proportions of 0, 0.5, 1.0 1.5, 2.0, and 2.5 wt% (by weight of the pulp) and curing was done for 28 and 56 days. Properties such as water and moisture absorption, compressive, flexural, and splitting tensile strengths, thermal conductivity, and specific heat capacity were appraised. The outcome of the examinations carried out revealed that water absorption rose with fiber loading while AMBF reinforced samples absorbed lesser water volume than UMBF reinforced samples; a feat occasioned by alkaline treatment of banana fiber. Moisture absorption increased with paper bricks doped with UMBF, while in the case of AMBF-paper bricks, property value was noted to depreciate with increment in AMBF proportion. Fiber loading resulted in improvement of compressive, flexural, and splitting tensile strengths and it was noted that AMBF reinforced samples performed better. The result of the thermal test showed that incorporation of UMBF led to depreciation in thermal conductivity while AMBF infusion in the bricks initiated increment in value. Opposite behaviour was observed for specific heat capacity as UMBF enhanced heat capacity while AMBF led to depreciation. Experimental trend analysis carried out indicates that curing length and alkaline modification of fiber were effective in maximizing the properties of paperbricks for masonry construction.

scholarly journals Testing a Gypsum Composite Based on Raw Gypsum with a Direct Admixture of Paraffin and Polymer to Improve Thermal Properties

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3241
Author(s):  
Krzysztof Powała ◽  
Andrzej Obraniak ◽  
Dariusz Heim
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Phase Change ◽  
Large Scale ◽  
Building Materials ◽  
Residential Buildings ◽  
Energy Performance ◽  
Polymer Content ◽  
Volumetric Heat Capacity

The implemented new legal regulations regarding thermal comfort, the energy performance of residential buildings, and proecological requirements require the design of new building materials, the use of which will improve the thermal efficiency of newly built and renovated buildings. Therefore, many companies producing building materials strive to improve the properties of their products by reducing the weight of the materials, increasing their mechanical properties, and improving their insulating properties. Currently, there are solutions in phase-change materials (PCM) production technology, such as microencapsulation, but its application on a large scale is extremely costly. This paper presents a solution to the abovementioned problem through the creation and testing of a composite, i.e., a new mixture of gypsum, paraffin, and polymer, which can be used in the production of plasterboard. The presented solution uses a material (PCM) which improves the thermal properties of the composite by taking advantage of the phase-change phenomenon. The study analyzes the influence of polymer content in the total mass of a composite in relation to its thermal conductivity, volumetric heat capacity, and diffusivity. Based on the results contained in this article, the best solution appears to be a mixture with 0.1% polymer content. It is definitely visible in the tests which use drying, hardening time, and paraffin absorption. It differs slightly from the best result in the thermal conductivity test, while it is comparable in terms of volumetric heat capacity and differs slightly from the best result in the thermal diffusivity test.

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