scholarly journals Relationship between Thermoelectric Properties and Formation of Microstructure, and Compressive Strength and Grain Size of Bi-Te Materials

1996 ◽  
Vol 104 (1206) ◽  
pp. 109-115 ◽  
Author(s):  
Takeo TOKIAI ◽  
Takasi UESUGI ◽  
Kunihito KOUMOTO
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Thermoelectric Properties

scholarly journals Effect of grain size on thermoelectric properties of CoSb3 compound

2005 ◽  
Vol 54 (12) ◽  
pp. 5763
Author(s):  
Yu Bo-Lin ◽  
Qi Qiong ◽  
Tang Xin-Feng ◽  
Zhang Qing-Jie
Keyword(s):  
Grain Size ◽  
Thermoelectric Properties

scholarly journals Pemanfaatan Lumpur Lapindo sebagai Bahan Baku Pembuatan Genteng Keramik dengan Variasi Suhu Pembakaran

Eksergi ◽  
2015 ◽  
Vol 12 (1) ◽  
pp. 08
Author(s):  
Wasir Nuri ◽  
Dyah Tri Retno
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Water Absorption ◽  
Combustion Temperature ◽  
Ambient Air ◽  
Industrial Area ◽  
Type I ◽  
Flooded Rice ◽  
Roof Tile ◽  
Silica Oxide

Lapindo mudflow issued a very large volume of mud. The mud flooded rice fields, residential and industrial area to date has not been stopped but the mud bursts untapped yet. Therefore, attempted use Lapindo mud very much it to be made tile. Sludge containing 55.4% silica oxide, alumina 16.1% and 8.9% iron with the composition of the possibility of mud can be created tile roof. Dried mud that has been mashed into the grain size of 80 mesh, then water added until plastic. Mud that has plastic printed with size 6 x 3 x 3 cm and then dried using ambient air. After the dried samples were burned using a furnace at temperatures varying from 500 to 900oC, after chilling the samples tested compressive strength, fracture modulus and water absorption. The results showed that the higher the combustion temperature obtained greater compressive strength and less water absorption. Most compressive strength is 142 kg/cm2and smallest water absorption is 0.06 g/cm2at a temperature of 900oC. At combustion temperatures of 500 to 700oC fracture modulus down from 72.78 to 41.81 kg/cm2 while at 700 to 900oC fracture modulus rose to 126.7 kg/cm2. The best results obtained on the combustion temperature at 800oC with fracture modulus 103.18 kg/cm2 and water absorption 0.08 g/cm2.   These results satisfy roof tile as type I according SII.0027 UDC-81. 666.74.

scholarly journals Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Pornsiri Wanarattikan ◽  
Piya Jitthammapirom ◽  
Rachsak Sakdanuphab ◽  
Aparporn Sakulkalavek
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Grain Size ◽  
Film Thickness ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Flexible Substrate ◽  
Rf Magnetron Sputtering ◽  
Mean Free Path

In this work, stoichiometric Sb2Te3 thin films with various thicknesses were deposited on a flexible substrate using RF magnetron sputtering. The grain size and thickness effects on the thermoelectric properties, such as the Seebeck coefficient (S), electrical conductivity (σ), power factor (PF), and thermal conductivity (k), were investigated. The results show that the grain size was directly related to film thickness. As the film thickness increased, the grain size also increased. The Seebeck coefficient and electrical conductivity corresponded to the grain size of the films. The mean free path of carriers increases as the grain size increases, resulting in a decrease in the Seebeck coefficient and increase in electrical conductivity. Electrical conductivity strongly affects the temperature dependence of PF which results in the highest value of 7.5 × 10−4 W/m·K2 at 250°C for film thickness thicker than 1 µm. In the thermal conductivity mechanism, film thickness affects the dominance of phonons or carriers. For film thicknesses less than 1 µm, the behaviour of the phonons is dominant, while both are dominant for film thicknesses greater than 1 µm. Control of the grain size and film thickness is thus critical for controlling the performance of Sb2Te3 thin films.

Microstructure Investigation of Non-equilibrium Synthesized Filled Skutterudite CeFe4Sb12

2010 ◽  
Vol 1267 ◽  
Author(s):  
Juan Zhou ◽  
Qing Jie ◽  
Qiang Li
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Grain Boundaries ◽  
Thermoelectric Properties ◽  
Conventional Solid State Reaction ◽  
Filled Skutterudite ◽  
Filled Skutterudites ◽  
Higher Carrier Mobility ◽  
P Type ◽  
Non Equilibrium

AbstractWe have prepared a variety of filled skutterudites through non-equilibrium synthesis by converting melt-spun ribbons into single phase polycrystalline bulk under pressure. In general, better thermoelectric properties are found in these samples. In this work, we performed microstructure characterization of non-equilibrium synthesized p-type filled skutterudite CeFe4Sb12 by X-ray diffraction, scanning electron microscopy and transmission electron microscopy in order to understand the structural origin of the improved thermoelectric properties. It is found that the non-equilibrium synthesized samples have smaller grain size and cleaner grain boundaries when compared to the samples prepared by the conventional solid-state reaction plus long term annealing. While smaller grain size can help reduce the lattice thermal conductivity, cleaner grain boundaries ensure higher carrier mobility and subsequently, higher electrical conductivity at the application temperatures.

High Efficiency Ecological Concrete

2014 ◽  
Vol 604 ◽  
pp. 157-160 ◽  
Author(s):  
Patricija Kara ◽  
Aleksandrs Korjakins
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Portland Cement ◽  
Alkaline Earth ◽  
High Efficiency ◽  
Cement Content ◽  
Soda Lime ◽  
Waste Glass ◽  
Concrete Mixture ◽  
Concrete Properties

Waste glass is cementitious in nature when it is finely ground, and especially when it is ground in a wet environment it can be finer than Portland cement. The obtained borosilicate lamp waste glass slurry with a grain size of 0.713 – 8.088 μm has shown better fineness and stability to segregation in comparison to soda-lime and soda-alkaline earth-silicate waste glasses. Elaborated high efficiency concrete with borosilicate lamp waste glass showed 120 MPa compressive strength at 28 days and it can be considered as ecological due to reduced cement content for 20% in concrete mixture without changing concrete properties in a negative way, reduced CO2 and waste glass deposits.

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