IndiumV3, Main, Repository, bibRecord, 003311

Citrate gel process and thermoelectric properties of Ge-doped In2O3 bulk ceramics

Identifieur interne : 003311 ( Main/Repository ); précédent : 003310; suivant : 003312

Citrate gel process and thermoelectric properties of Ge-doped In2O3 bulk ceramics

Auteurs : RBID : Pascal:11-0216272

Descripteurs français

Pascal (Inist)
- Céramique oxyde, Dopage, Poudre, Solubilité, Diffraction RX, Microscopie électronique balayage, Frittage, Propriété thermique, Conductivité thermique, Matériau composite, Hyperfréquence, Microstructure, Nanoparticule.
Wicri :
- concept : Dopage, Matériau composite.

English descriptors

KwdEn :
- Composite material, Doping, Microstructure, Microwave, Nanoparticle, Oxide ceramics, Powder, Scanning electron microscopy, Sintering, Solubility, Thermal conductivity, Thermal properties, X ray diffraction.

Abstract

Indium oxide ceramics doped with different doping levels of germanium (from 0 to 10 at.%) were prepared with nano-sized powders obtained by citrate gel process. Ge for In substitution in the In₂O₃ bixbyite structure below the solubility limit (about 0.5-1 atom%) leads to a large decrease in the electrical resistivity and the absolute value of the Seebeck coefficient. X-ray diffraction and scanning electron microscopy show the presence after sintering of well dispersed secondary phases In₂Ge₂O₇ when the Ge solubility in the In₂O₃ matrix is passed. The thermal properties measurements confirm that the decrease in the lattice thermal conductivity observed in these composite materials can be attributed to the presence of insulating In₂Ge₂O₇ phases. Furthermore, preliminary microwave sintering experiments have been tested in order to keep the nanoscale after sintering. Particular nano-microstructures were obtained due to minimal grain growth induced by this rapid sintering process.

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Pascal:11-0216272

Le document en format XML

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O<sub>3</sub>
 bulk ceramics</title>
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<term>Scanning electron microscopy</term>
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<term>Solubility</term>
<term>Thermal conductivity</term>
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<term>X ray diffraction</term>
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<term>Solubilité</term>
<term>Diffraction RX</term>
<term>Microscopie électronique balayage</term>
<term>Frittage</term>
<term>Propriété thermique</term>
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<front><div type="abstract" xml:lang="en">Indium oxide ceramics doped with different doping levels of germanium (from 0 to 10 at.%) were prepared with nano-sized powders obtained by citrate gel process. Ge for In substitution in the In<sub>2</sub>
O<sub>3</sub>
 bixbyite structure below the solubility limit (about 0.5-1 atom%) leads to a large decrease in the electrical resistivity and the absolute value of the Seebeck coefficient. X-ray diffraction and scanning electron microscopy show the presence after sintering of well dispersed secondary phases In<sub>2</sub>
Ge<sub>2</sub>
O<sub>7</sub>
 when the Ge solubility in the In<sub>2</sub>
O<sub>3</sub>
 matrix is passed. The thermal properties measurements confirm that the decrease in the lattice thermal conductivity observed in these composite materials can be attributed to the presence of insulating In<sub>2</sub>
Ge<sub>2</sub>
O<sub>7</sub>
 phases. Furthermore, preliminary microwave sintering experiments have been tested in order to keep the nanoscale after sintering. Particular nano-microstructures were obtained due to minimal grain growth induced by this rapid sintering process.</div>
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O<sub>3</sub>
 bulk ceramics</s1>
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<fC01 i1="01" l="ENG"><s0>Indium oxide ceramics doped with different doping levels of germanium (from 0 to 10 at.%) were prepared with nano-sized powders obtained by citrate gel process. Ge for In substitution in the In<sub>2</sub>
O<sub>3</sub>
 bixbyite structure below the solubility limit (about 0.5-1 atom%) leads to a large decrease in the electrical resistivity and the absolute value of the Seebeck coefficient. X-ray diffraction and scanning electron microscopy show the presence after sintering of well dispersed secondary phases In<sub>2</sub>
Ge<sub>2</sub>
O<sub>7</sub>
 when the Ge solubility in the In<sub>2</sub>
O<sub>3</sub>
 matrix is passed. The thermal properties measurements confirm that the decrease in the lattice thermal conductivity observed in these composite materials can be attributed to the presence of insulating In<sub>2</sub>
Ge<sub>2</sub>
O<sub>7</sub>
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Citrate gel process and thermoelectric properties of Ge-doped In2O3 bulk ceramics

Citrate gel process and thermoelectric properties of Ge-doped In2O3 bulk ceramics

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