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High‐Temperature Thermoelectric Properties of Sol–Gel Processed Ca2.5Ag0.3RE0.2Co4O9 (RE: Y and Rare‐Earths) Materials
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-05-15 , DOI: 10.1002/pssa.202000056 Enes Kilinc 1 , Fatih Uysal 2 , Erdal Celik 3, 4 , Huseyin Kurt 5
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-05-15 , DOI: 10.1002/pssa.202000056 Enes Kilinc 1 , Fatih Uysal 2 , Erdal Celik 3, 4 , Huseyin Kurt 5
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Herein, dually doped Ca2.5Ag0.3RE 0.2Co4O9 (RE : La, Pr, Nd, Sm, Gd, Dy, Er, Yb, Eu, Tb, Ho, Lu, Ce, and Y) samples are synthesized by sol–gel technique and consolidated by cold pressing under high pressure to systematically scrutinize the influences of Y and rare‐earth dually doping with Ag on transport properties of Ca3Co4O9 for high‐temperature thermoelectric (TE) applications. Characterization results reveal that targeted phase is successfully produced, and doping of the compositions is provided. Doping of Y and rare‐earth elements together with Ag into the Ca2+ site is effective in increasing the Seebeck coefficient and decreasing the electrical resistivity of the samples, thanks to the reduction in carrier concentration. Thermal conductivity of the samples is reduced related to the lower relative densities and alloy scattering originated from dually doping. Among the samples, Ca2.5Ag0.3Ho0.2Co4O9 and Ca2.5Ag0.3Eu0.2Co4O9 exhibit the highest power factor (PF ) values of 0.65 and 0.62 mW m−1 K−2 at 800 °C, respectively. These results are quite high for bulk oxide TE materials which can be assessed as potential oxide TE materials for high‐temperature TE power generation.
中文翻译：
溶胶-凝胶法处理的Ca2.5Ag0.3RE0.2Co4O9（RE：Y和稀土）材料的高温热电性质
在此，通过以下方式合成了双掺杂Ca 2.5 Ag 0.3 RE 0.2 Co 4 O 9（RE：La，Pr，Nd，Sm，Gd，Dy，Er，Yb，Eu，Tb，Ho，Lu，Ce和Y）样品溶胶-凝胶技术并在高压下通过冷压进行固结，以系统地研究Y和稀土双重掺杂Ag对高温热电（TE）应用中Ca 3 Co 4 O 9输运性能的影响。表征结果表明成功地产生了目标相，并提供了组合物的掺杂。将Y和稀土元素与Ag一起掺杂到Ca 2+中由于载流子浓度的降低，该位点可有效提高塞贝克系数并降低样品的电阻率。样品的热导率由于较低的相对密度而降低，并且由于双重掺杂而引起的合金散射。在样品中，Ca 2.5 Ag 0.3 Ho 0.2 Co 4 O 9和Ca 2.5 Ag 0.3 Eu 0.2 Co 4 O 9的最高功率因数（PF）值分别为0.65和0.62 mW m -1 K -2分别在800°C下。对于块状氧化物TE材料，这些结果是很高的，可以将其评估为高温TE发电的潜在氧化物TE材料。
更新日期：2020-05-15
中文翻译：
溶胶-凝胶法处理的Ca2.5Ag0.3RE0.2Co4O9（RE：Y和稀土）材料的高温热电性质
在此，通过以下方式合成了双掺杂Ca 2.5 Ag 0.3 RE 0.2 Co 4 O 9（RE：La，Pr，Nd，Sm，Gd，Dy，Er，Yb，Eu，Tb，Ho，Lu，Ce和Y）样品溶胶-凝胶技术并在高压下通过冷压进行固结，以系统地研究Y和稀土双重掺杂Ag对高温热电（TE）应用中Ca 3 Co 4 O 9输运性能的影响。表征结果表明成功地产生了目标相，并提供了组合物的掺杂。将Y和稀土元素与Ag一起掺杂到Ca 2+中由于载流子浓度的降低，该位点可有效提高塞贝克系数并降低样品的电阻率。样品的热导率由于较低的相对密度而降低，并且由于双重掺杂而引起的合金散射。在样品中，Ca 2.5 Ag 0.3 Ho 0.2 Co 4 O 9和Ca 2.5 Ag 0.3 Eu 0.2 Co 4 O 9的最高功率因数（PF）值分别为0.65和0.62 mW m -1 K -2分别在800°C下。对于块状氧化物TE材料，这些结果是很高的，可以将其评估为高温TE发电的潜在氧化物TE材料。
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