This study investigates the crystal structure,microstructure,electronic,thermal transport properties,and thermoelectric performance ofα-MgAgSb synthesized through various ball milling techniques.Variations in synthes...This study investigates the crystal structure,microstructure,electronic,thermal transport properties,and thermoelectric performance ofα-MgAgSb synthesized through various ball milling techniques.Variations in synthesis methods can significantly impact thermoelectric performance.Our findings indicate that impurity phases,particularly the secondary phase Ag_(3)Sb,hinder grain growth and decrease carrier mobility.By systematically adjusting milling conditions,the increased grain size resulting from the suppression of impurity formation improves charge carrier mobility and enhances the power factor.Low-temperature resistivity analysis reveals distinct scattering mechanisms influenced by impurity levels.α-MgAgSb with a tiny content of Sb primarily exhibits electron-electron scattering,whereas higher impurity levels introduce both electron-electron and electron-phonon scattering.Additionally,thermal conductivity analysis using three Effective Medium Theory(EMT)methods shows that the distribution of Ag_(3)Sb increases interfacial resistance.The maximum zT value of 1.36 was achieved in a compound with anα-MgAgSb to Sb ratio of 99%:1%.展开更多
基金financially supported by JST Mirai Program(No.JPMJMI19A1).
文摘This study investigates the crystal structure,microstructure,electronic,thermal transport properties,and thermoelectric performance ofα-MgAgSb synthesized through various ball milling techniques.Variations in synthesis methods can significantly impact thermoelectric performance.Our findings indicate that impurity phases,particularly the secondary phase Ag_(3)Sb,hinder grain growth and decrease carrier mobility.By systematically adjusting milling conditions,the increased grain size resulting from the suppression of impurity formation improves charge carrier mobility and enhances the power factor.Low-temperature resistivity analysis reveals distinct scattering mechanisms influenced by impurity levels.α-MgAgSb with a tiny content of Sb primarily exhibits electron-electron scattering,whereas higher impurity levels introduce both electron-electron and electron-phonon scattering.Additionally,thermal conductivity analysis using three Effective Medium Theory(EMT)methods shows that the distribution of Ag_(3)Sb increases interfacial resistance.The maximum zT value of 1.36 was achieved in a compound with anα-MgAgSb to Sb ratio of 99%:1%.
