[ABSTRAK
Pemanfaatan panas yang tidak terpakai adalah salah satu bentuk efisiensi energi.Panas yang tidak terpakai dari industri dan transportasi dapat dikonversikanmenjadi energi listrik dengan menggunakan material termoelektrik. KeramikCa3Co2O6 dan CaMnO3 adalah salah satu contoh material. Penelitian yangdilakukan adalah percobaan sintesis keramik Ca3Co2O6 dan CaMnO3menggunakan metode proses reaksi padatan.Sintesis material menggunakan bahan baku berbasis karbonat, yaitu CaCO3,CoCO3 dan MnCO3. Sintesis dilakukan dengan mengacu pada diagram fasasistem Ca-Co-O dan Ca-Mn-O. Berdasarkan analisis termal, untuk mendapatkanfasa CaO, Co3O4 dan Mn2O3 maka bahan baku yang berbasis karbonat harusdikalsinasi pada suhu ≥ 800°C. Suhu pembentukan Ca3Co2O6 berdasarkandiagram fasa sistem Ca-Co-O dan Ca-Mn-O adalah pada rentang suhu 824-1027°C dan CaMnO3 pada rentang suhu 1100-1600°C dengan lingkunganatmosfir udara bebas.Hasil sintesis diperoleh fasa Ca3Co2O6 terbentuk paling baik pada suhu 1000°C,tetapi masih terdapat fasa lain yaitu CoO dan Co3O4. Fraksi berat masing-masingfasa adalah Ca3Co2O6 : CoO : Co3O4 = 71,1 : 21,6 : 7,3. Sedangkan pada sintesisCaMnO3, fasa CaMnO3 sudah terbentuk satu fasa pada suhu 1100°C.

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ABSTRACT
Heat is one kind of energy source that can increases energy efficiency. Heat fromindustrial and transportation can be converted into electrical energy through athermoelectric material. Ca3Co2O6 and CaMnO3 ceramics are thermoelectricmaterials. The main idea of this research is synthesis of Ca3Co2O6 and CaMnO3ceramics using solid state reaction method.Synthesis of thermoelectric materials using carbonate-based raw materials. Theraw materials are CaCO3, CoCO3 and MnCO3. Synthesis of material is done withreference to the phase diagram system of Ca-Co-O and Ca-Mn-O. Based onthermal analysis, the carbonate-based raw materials must be calcined attemperature ≥ 800°C to get CaO, Co3O4 and Mn2O3 phases. The temperatureformation of Ca3Co2O6 and CaMnO3 are about 824-1027°C based on phasediagram system of Ca-Co-O and 1100-1600°C based on phase diagram system ofCa-Mn-O in air.Ca3Co2O6 phase is formed at temperatures of 1000°C, but there were some otherphase, i.e,. CoO and Co3O4. Weight fraction of each phase is Ca3Co2O6 : CoO :Co3O4 = 71,1 : 21,6 : 7,3. While CaMnO3 one phase is already formed at 1100°C.;Heat is one kind of energy source that can increases energy efficiency. Heat fromindustrial and transportation can be converted into electrical energy through athermoelectric material. Ca3Co2O6 and CaMnO3 ceramics are thermoelectricmaterials. The main idea of this research is synthesis of Ca3Co2O6 and CaMnO3ceramics using solid state reaction method.Synthesis of thermoelectric materials using carbonate-based raw materials. Theraw materials are CaCO3, CoCO3 and MnCO3. Synthesis of material is done withreference to the phase diagram system of Ca-Co-O and Ca-Mn-O. Based onthermal analysis, the carbonate-based raw materials must be calcined attemperature ≥ 800°C to get CaO, Co3O4 and Mn2O3 phases. The temperatureformation of Ca3Co2O6 and CaMnO3 are about 824-1027°C based on phasediagram system of Ca-Co-O and 1100-1600°C based on phase diagram system ofCa-Mn-O in air.Ca3Co2O6 phase is formed at temperatures of 1000°C, but there were some otherphase, i.e,. CoO and Co3O4. Weight fraction of each phase is Ca3Co2O6 : CoO :Co3O4 = 71,1 : 21,6 : 7,3. While CaMnO3 one phase is already formed at 1100°C., Heat is one kind of energy source that can increases energy efficiency. Heat fromindustrial and transportation can be converted into electrical energy through athermoelectric material. Ca3Co2O6 and CaMnO3 ceramics are thermoelectricmaterials. The main idea of this research is synthesis of Ca3Co2O6 and CaMnO3ceramics using solid state reaction method.Synthesis of thermoelectric materials using carbonate-based raw materials. Theraw materials are CaCO3, CoCO3 and MnCO3. Synthesis of material is done withreference to the phase diagram system of Ca-Co-O and Ca-Mn-O. Based onthermal analysis, the carbonate-based raw materials must be calcined attemperature ≥ 800°C to get CaO, Co3O4 and Mn2O3 phases. The temperatureformation of Ca3Co2O6 and CaMnO3 are about 824-1027°C based on phasediagram system of Ca-Co-O and 1100-1600°C based on phase diagram system ofCa-Mn-O in air.Ca3Co2O6 phase is formed at temperatures of 1000°C, but there were some otherphase, i.e,. CoO and Co3O4. Weight fraction of each phase is Ca3Co2O6 : CoO :Co3O4 = 71,1 : 21,6 : 7,3. While CaMnO3 one phase is already formed at 1100°C.]