scholarly journals Effects of La, Sm and Yb doping on thermoelectric properties of Ca0.98Er0.02MnO3 at high temperature

RSC Advances ◽  
2017 ◽  
Vol 7 (71) ◽  
pp. 44659-44664 ◽  
Author(s):  
Tao Yang ◽  
Tiexin Cheng
Keyword(s):  
High Temperature ◽  
Thermoelectric Properties ◽  
Sol Gel ◽  
Ceramic Materials ◽  
Pressing Method ◽  
Cold Pressing ◽  
Perovskite Type

A series of perovskite-type ceramic materials Ca0.98Er0.02MnO3 (CDM) and Ca0.96Er0.02Re0.02MnO3 (Re = La, Sm, Yb) (denoted as CDM-La, CDM-Sm, CDM-Yb) which worked from 300 K to 1000 K with excellent thermoelectric properties was prepared by a sol–gel and cold-pressing method.

Preparation and Analysis of Novel Thermoelectric Material (SrxCa1-x)3Co4O9

2014 ◽  
Vol 492 ◽  
pp. 326-330
Author(s):  
Jie Wang ◽  
Li Peng Zhang ◽  
Yan Li
Keyword(s):  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Sol Gel ◽  
Ceramic Materials ◽  
High Electrical Conductivity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Clear Cut ◽  
Sol Gel Process ◽  
High Seebeck Coefficient

Nanometer-sized (SrxCa1-x)3Co4O9powders were prepared using the sol-gel process. Two Ca-Co-O ceramic thermoelectric materials were then prepared and characterized with X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The microstructure and thermoelectric properties of the ceramic materials were studied. The experimental results showed that the crystals of (SrxCa1-x)3CO4grew into materials with high density and low pore rate under optimal Sr-doped conditions. The (SrxCa1-x)3Co4O9ceramic materials contain directional arrays with cube-shaped grains in a layered arrangement. The crystals were fully developed and the interface between layers was clear-cut. The thermoelectric properties of (SrxCa1-x)3Co4O9ceramics were greatly improved, with high Seebeck coefficient and high electrical conductivity. The Seebeck Coefficient positively correlated with the rise of temperature.

Preparation and High Temperature Thermoelectric Properties of [Ca2(Co0.65Cu0.35)2O4]0.624CoO2 Compound

2007 ◽  
Vol 336-338 ◽  
pp. 805-808 ◽  
Author(s):  
Xiao Ya Li ◽  
Yun Yu ◽  
Dong Li Wang ◽  
Li Dong Chen
Keyword(s):  
High Temperature ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Conduction Mechanism ◽  
Sol Gel ◽  
Hopping Conduction ◽  
Dimensionless Figure Of Merit ◽  
Plasma Sintering ◽  
Thermoelectric Energy ◽  
Spark Plasma

[Ca2(Co0.65Cu0.35)2O4]0.624CoO2 polycrystalline samples were prepared using sol-gel method followed by spark plasma sintering. Thermoelectric properties of the samples were examined from room temperature to 1000K. The temperature dependence of electrical conductivity shows that the hole hopping conduction mechanism is dominant for the samples. The activation energy of hopping conduction is 0.11 eV. At the temperature of about 1000K, the electrical resistivity is 7.1m cm, the thermopower is 160 μVK-1, the thermal conductivtity is 2.94Wm-1K-1 and dimensionless figure of merit reaches 0.12. These results indicate [Ca2(Co0.65Cu0.35)2O4]0.624CoO2 is a potential material for high temperature thermoelectric energy conversion.

scholarly journals Prospects for using high-temperature ceramic and glass-ceramic materials and antioxidant coatings in aeronautical engineering

2016 ◽  
pp. 64-71
Author(s):  
D. V. Graschenkov ◽  
M. L. Vaganova ◽  
Yu. E. Lebedeva ◽  
O. Yu. Sorokin ◽  
A. S. Chaynikova
Keyword(s):  
High Temperature ◽  
Glass Ceramic ◽  
High Speed ◽  
Sol Gel ◽  
Ceramic Materials ◽  
Federal State ◽  
Glass Ceramic Materials ◽  
Plasma Sintering ◽  
Russian Research Institute ◽  
Oxidation Resistant

The study focuses on the prospects and advantages of high-temperature ceramic, glass-ceramic materials and oxidation-resistant coatings use for fabrication of high-speed aircraft structures. The paper describes achievements of Federal State Unitary Enterprise “All-Russian Research Institute of Aircraft Materials” in the field of ceramic materials development via hybrid method of spark plasma sintering, sol-gel method and thermochemical synthesis. Moreover, the article shows the research results concerning the development of oxidation-resistant coatings for C/SiC and C/C materials.

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