Microstructure and Thermoelectric Properties of AgSbO3 Ceramics Prepared by Ion-Exchange Powder Synthesis and Normal Sintering

Abstract

Silver antimonate (AgSbO 3 ) is a potential high-temperature thermoelectric oxide with a low thermal conductivity, but it is difficult to fabricate dense bulk material with high phase purity. Well-dispersed AgSbO 3 nanopowder with an average diameter of 50 nm was synthesized by an ion-exchange process in this study, the sintering density of which was apparently enhanced. Nearly single-phase AgSbO 3 ceramic samples with a relative density close to 90% were obtained when sintered at a relatively low temperature (1273 K). The electrical conductivity of AgSbO 3 increased greatly with increasing sintering temperature, probably because of defects originating from the compositional deviation caused by sintering, in addition to increased density. This study also confirmed that AgSbO 3 had a low thermal conductivity, from 1.1 W m À1 K À1 at room temperature to 0.8 W m À1 K À1 at 673 K.

Preparation of Magnesium Oxide and Potassium Magnesium Phosphate Cement From Lithium-Extracting Magnesium Slag

“…Sivasankari [17] found that K and Na can improve the crystallinity and particle size of the crystals when calcining MgO at 800 °C. Li [18] showed that adding Cl − in powder preparation can promote the sintering, densification, and grain lengthening of the MgO.…”

Hydrothermal Preparation of Ag/Ag1.69Sb2.27O6.25 Sesame‐Hollow‐Ball‐Type Nanocomposites: The Formation Mechanism of Metallic Ag in the Ag‐H2O System at 400 K

“…e fabrication of silver antimonite nanoparticles has been intensively investigated in recent years due to their high electron mobility and photocatalytic activity, which are technological applications in visible-light-sensitive photocatalysts [1][2][3][4][5]. Due to the conduction band bottom mainly comprised of the hybridized hybridized Ag 5s and Sb 5s orbitals and the valence band top of Ag 4d and O 2p, silver antimonite was reported to possess higher visible-light sensitivity compared with Ag-containing d-block metal complex oxides such as AgNbO 3 and AgVO 3 [6,7].…”

Thermoelectric Properties of Silver Antimonate with Mixed Valency of Antimony

“…Different from these oxides, silver antimonite (AgSbO 3 ), which has a defect pyrochlore structure composed of linear chains of AgO 6 and SbO 6 , possesses rather high µ originating from its highly-dispersed valence band and conduction band composed of Ag 5s and Sb 5s orbitals, respectively [5] [6]. In addition, AgSbO 3 has low stacking density and thus its κ ph is significantly lower than those of other oxides [7] [8]. So, AgSbO 3 has been investigated as a candidate n-type TE material, e.g., by addition of CuO [5] and by using a spark plasma sintering (SPS) method to prepare dense AgSbO 3 [7].…”