Fig. 1. Bulk XRD patterns of Ag₂S compound at (a) 300 K and (b) 600 K. Ag₂S化合物在(a) 300 K和(b) 600 K时的块体XRD图谱

Fig. 2. (a) Backscattering image of Ag₂S compound. Elemental mappings of (b) all elements, (c) Ag, and (d) S, respectively. Ag₂S化合物的(a)背散射电子图片; (b)所有元素, (c) Ag和(d) S的元素分布

Fig. 3. (a) Specific heat at constant pressure C_p of Ag₂S compound; (b) comparison of C_p and the calculated specific heat at constant volume C_V. The dash-dot lines are the theoretical C_V of solid and liquid, respectively. Ag₂S化合物的(a)定压热容C_p及(b)相同温度下的C_p和定容热容C_V计算值的比较, 其中点划线分别为固体的C_V理论值3Nk_B和液体的C_V理论值2Nk_B

Fig. 4. Temperature dependence of ionic conductivity (σ_i) for Ag₂S compound. Ag₂S化合物的离子电导率(σ_i)随温度的变化

Fig. 5. Temperature dependences of (a) carrier concentration n_H and (b) carrier mobility for Ag₂S compound. Ag₂S化合物的(a)载流子浓度n_H和(b)载流子迁移率 随温度的变化

Fig. 6. Temperature dependences of (a) Seebeck coefficient S, (b) electrical conductivity σ, and (c) power factor (PF) for Ag₂S compound. Ag₂S化合物的(a)泽贝克系数S、(b)电导率σ、(c)功率因子PF随温度的变化

Fig. 7. Temperature dependences of (a) total thermal concentration κ and (b) lattice thermal conductivity κ_L for Ag₂S compound. The κ_L data for Cu₂Se^[5] and Cu₂S^[37] are included for comparison in panel (b). Ag₂S化合物的(a)总热导率κ和(b)晶格热导率κ_L随温度的变化, 图(b)中虚线所示为Cu₂Se^[5]和Cu₂S^[37]快离子导体热电材料的晶格热导率

Fig. 8. Phonon dispersion relations and density of states for Ag₂S compound. Ag₂S的声子色散关系和声子态密度图

Fig. 9. Temperature dependence of thermoelectric figure-of-merit zT for Ag₂S compound. The data for Ag₂Se^[30], Ag₂Te^[31] and CuAgSe^[10] are included for comparison. Ag₂S化合物的热电优值zT随温度的变化, 虚线所示为Ag₂Se^[30], Ag₂Te^[31]和CuAgSe^[10]等Ag基快离子导体热电材料的热电优值