Phase and electrical properties of Ca3Co4O9 ceramic prepared by a citrate sol-gel route
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Ca3Co4O9 is a ceramic material with the potential for application as a thermoelectric material. Several methods have beendeveloped to manufacture the Ca3Co4O9 material. In this work, the Ca3Co4O9 ceramic was synthesized via citrate sol-gel routefollowed by mechanical milling. The samples after sintering at 850 oC for 3 and 6 hours were characterized for XRD studies. Based on XRD results, single phase of Ca3Co4O9 was shown in all samples. The crystallite size of Ca3Co4O9 samples in a rangeof 53.91-66.54 nm. The electrical measurement of Ca3Co4O9 sample showed an insulator phenomenon from 20 K to 80 K anda metallic behavior from 90 K to room temperature.
Abstract
Ca3Co4O9 is a ceramic material with the potential for application as a thermoelectric material. Several methods have beendeveloped to manufacture the Ca3Co4O9 material. In this work, the Ca3Co4O9 ceramic was synthesized via citrate sol-gel routefollowed by mechanical milling. The samples after sintering at 850 oC for 3 and 6 hours were characterized for XRD studies. Based on XRD results, single phase of Ca3Co4O9 was shown in all samples. The crystallite size of Ca3Co4O9 samples in a rangeof 53.91-66.54 nm. The electrical measurement of Ca3Co4O9 sample showed an insulator phenomenon from 20 K to 80 K anda metallic behavior from 90 K to room temperature.
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