Microwave heating synthesis and thermoelectric property characterization of highly dense Ca3Co4O9 bulk
Source abstract
Abstract
Abstract The present study is focused on synthesis and sintering of calcium cobaltite (Ca3Co4O9) by solid-state reaction of calcium carbonate (CaCO3) and cobalt oxide (Co3O4) using microwave heating at 850, 900, and 950 °C. Thermogravimetric Analysis (TGA) and Differential Thermal Analysis (DTA) results show a weight loss of ~26% due to the decomposition of CaCO3 in the temperature range of 600–820 °C, resulting into single phase of Ca3Co4O9 which remains stable up to 920 °C. The Ca3Co4O9 phase is observed in samples heated at 850 °C and 900 °C, whereas at 950 °C, Ca3Co4O9 is transformed to Ca3Co2O6 as identified by X-Ray Diffractometry. 98.76% of relative density is obtained by microwave sintered sample at 950 °C with 1hr holding time. Changes in synthesis temperature did not show any effect on the Seebeck coefficient (119–155 μV/K). The specimens sintered at 900 °C exhibit a low resistivity (150-160 μΩ-m) and better power factor (94–145 μW/mK2) in the 35–500 °C temperature range.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Heusler alloys: electronic and magnetic properties · Thermal Expansion and Ionic Conductivity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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