无机材料学报2022，Vol.37Issue(1)：101-106,6.DOI:10.15541/jim20200653
区熔法制备金属硫化物Ag2S及其热电性能研究
Metal Sulfide Ag2S: Fabrication via Zone Melting Method and Its Thermoelectric Property
摘要
Abstract
Metal sulfide Ag2S is an attractive semiconductor due to its excellent physical and chemical property that enable it with wide applications in fields of catalysis, sensing, optoelectronics in past years. In present work, ?18 mm× 50 mm Ag2S ingot was successfully prepared using zone melting method and its thermoelectric (TE) behavior was investigated. Ag2S has standard monoclinic P21/c space group (α-Ag2S phase) below 450 K and transfer to cubic structure (β-Ag2S phase) over this temperature. Ag2S is a n-type semiconductor as the Seebeck coefficient S is always negative due to the Ag interstitial ions in the material that can provide additional electrons. S is about -1200 μV·K–1 near room temperature, declines to -680 μV·K–1 at 440 K and finally decreases to ～-100 μV·K–1 at β-Ag2S state. The electrical conductivity (σ) of α-Ag2S is almost zero. However, the value sharply jumps to ～40000.5 S·m–1 as the material just changes to β-Ag2S at 450 K and then gradually deceases to 33256.2 S·m–1 at 650 K. Hall measurement demonstrates that carrier concentration nH of Ag2S is suddenly increased from the level of ～1017 cm–3 to ～1018 cm–3 during phase transition. Total thermal conductivity κ of α-Ag2S is ～0.20 W·m–1·K–1 but is ～0.45 W·m–1·K–1 of β-Ag2S. Ultimately, a maximum ZT=0.57 is achieved around 580 K that means Ag2S might be a promising middle-temperature TE material.关键词
Ag2S/区熔/热电材料/相转变Key words
Ag2S/zone melting/thermoelectric material/phase transition分类
化学化工引用本文复制引用
金敏,白旭东,张如林,周丽娜,李荣斌..区熔法制备金属硫化物Ag2S及其热电性能研究[J].无机材料学报,2022,37(1):101-106,6.基金项目
Shanghai Natural Science Foundation(19ZR1419900) （19ZR1419900）
