Aguilarite Ag4SSe Thermoelectric Material: Natural Mineral with Low Lattice Thermal Conductivity.

Ag4SSe, named as aguilarite in mineralogy, belongs to the family of liquid-like superionic compounds at middle temperature, but its thermoelectric (TE) properties are rarely investigated so far. In this study, a series of Ag-deficient Ag4SSe samples have been synthesized by the melting-annealing method. Their crystal structures, phase transition features, and electrical and thermal transport properties have been systematically investigated. It is found that Ag4SSe allows a small amount of Ag deficiency inside the lattice without altering the initial crystal structure and phase transition feature. The stoichiometric Ag4SSe has a low TE figure of merit ( zT) of 0.24 at 613 K because of the overhigh carrier concentration. Introducing Ag deficiency in Ag4SSe significantly lowers the carrier concentration, yielding a greatly enhanced Seebeck coefficient and suppressed carrier thermal conductivity throughout the entire measured temperature range. A maximum TE zT of 0.53 is achieved at 493 K for Ag3.96SSe, about two times that for the stoichiometric Ag4SSe. The present study suggests that aguilarite Ag4SSe is a promising TE material applied at the middle temperature range.

[1]  B. Jiang,et al.  Significantly optimized thermoelectric properties in high-symmetry cubic Cu7PSe6 compounds via entropy engineering , 2018 .

[2]  Lidong Chen,et al.  Room-temperature ductile inorganic semiconductor , 2018, Nature Materials.

[3]  Jiong Yang,et al.  Improved electrical transport properties and optimized thermoelectric figure of merit in lithium-doped copper sulfides , 2018, Rare Metals.

[4]  B. Iversen,et al.  High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures , 2017 .

[5]  G. J. Snyder,et al.  Band engineering in Mg_3Sb_2 by alloying with Mg_3Bi_2 for enhanced thermoelectric performance , 2017 .

[6]  B. Jiang,et al.  An argyrodite-type Ag9GaSe6 liquid-like material with ultralow thermal conductivity and high thermoelectric performance. , 2017, Chemical communications.

[7]  Jinlong Yu,et al.  Thermoelectric properties of copper-deficient Cu2-xSe (0.05 ≤ x ≤ 0.25) binary compounds , 2017 .

[8]  Tiejun Zhu,et al.  Compromise and Synergy in High‐Efficiency Thermoelectric Materials , 2017, Advanced materials.

[9]  G. J. Snyder,et al.  Enhanced Thermoelectric Performance through Tuning Bonding Energy in Cu2Se1–xSx Liquid-like Materials , 2017 .

[10]  C. Uher,et al.  Partial indium solubility induces chemical stability and colossal thermoelectric figure of merit in Cu2Se , 2017 .

[11]  Xun Shi,et al.  Ultrahigh thermoelectric performance in Cu2−ySe0.5S0.5 liquid-like materials , 2017 .

[12]  G. J. Snyder,et al.  High Electron Mobility and Disorder Induced by Silver Ion Migration Lead to Good Thermoelectric Performance in the Argyrodite Ag8SiSe6 , 2017 .

[13]  Jing Zhao,et al.  High Thermoelectric Performance in Electron-Doped AgBi3S5 with Ultralow Thermal Conductivity. , 2017, Journal of the American Chemical Society.

[14]  Gangjian Tan,et al.  Rationally Designing High-Performance Bulk Thermoelectric Materials. , 2016, Chemical reviews.

[15]  Wenqing Zhang,et al.  Low Sound Velocity Contributing to the High Thermoelectric Performance of Ag8SnSe6 , 2016, Advanced science.

[16]  J. Zou,et al.  Te-Doped Cu2Se nanoplates with a high average thermoelectric figure of merit , 2016 .

[17]  Geoffroy Hautier,et al.  Thinking Like a Chemist: Intuition in Thermoelectric Materials. , 2016, Angewandte Chemie.

[18]  C. Uher,et al.  Recent advances in high-performance bulk thermoelectric materials , 2016 .

[19]  Marco Buongiorno Nardelli,et al.  Convergence of multi-valley bands as the electronic origin of high thermoelectric performance in CoSb3 skutterudites. , 2015, Nature materials.

[20]  Suhuai Wei,et al.  High thermoelectric performance in copper telluride , 2015 .

[21]  Lihua Wu,et al.  Compound defects and thermoelectric properties in ternary CuAgSe-based materials , 2015 .

[22]  G. J. Snyder,et al.  High thermoelectric and mechanical performance in highly dense Cu2−xS bulks prepared by a melt-solidification technique , 2015 .

[23]  Jihui Yang,et al.  Two-dimensional thermoelectrics with Rashba spin-split bands in bulk BiTeI , 2014 .

[24]  Lidong Chen,et al.  Sulfide bornite thermoelectric material: a natural mineral with ultralow thermal conductivity , 2014 .

[25]  Q. Zhang,et al.  Self-propagating high-temperature synthesis for compound thermoelectrics and new criterion for combustion processing , 2014, Nature Communications.

[26]  G. J. Snyder,et al.  Thermoelectric transport in Cu7PSe6 with high copper ionic mobility. , 2014, Journal of the American Chemical Society.

[27]  G. J. Snyder,et al.  High Thermoelectric Performance in Non‐Toxic Earth‐Abundant Copper Sulfide , 2014, Advanced materials.

[28]  M. Kanatzidis,et al.  Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals , 2014, Nature.

[29]  G. J. Snyder,et al.  Evaluating the potential for high thermoelectric efficiency of silver selenide , 2013 .

[30]  D. K. Aswal,et al.  CuCrSe2: a high performance phonon glass and electron crystal thermoelectric material , 2013 .

[31]  V. Ozoliņš,et al.  High Performance Thermoelectricity in Earth‐Abundant Compounds Based on Natural Mineral Tetrahedrites , 2013 .

[32]  L. Bindi,et al.  On the symmetry and crystal structure of aguilarite, Ag4SeS , 2013, Mineralogical Magazine.

[33]  G. J. Snyder,et al.  Copper ion liquid-like thermoelectrics. , 2012, Nature materials.

[34]  Kun Li,et al.  Superionic phase transition in silver chalcogenide nanocrystals realizing optimized thermoelectric performance. , 2012, Journal of the American Chemical Society.

[35]  Joseph P. Heremans,et al.  Resonant levels in bulk thermoelectric semiconductors , 2012 .

[36]  G. J. Snyder,et al.  Stabilizing the Optimal Carrier Concentration for High Thermoelectric Efficiency , 2011, Advanced materials.

[37]  Yuanhua Lin,et al.  Remarkable enhancement in thermoelectric performance of BiCuSeO by Cu deficiencies. , 2011, Journal of the American Chemical Society.

[38]  G. J. Snyder,et al.  Alloying to increase the band gap for improving thermoelectric properties of Ag2Te , 2011 .

[39]  K. Esfarjani,et al.  Enhancement of thermoelectric figure-of-merit by resonant states of aluminium doping in lead selenide , 2011 .

[40]  S. Misture,et al.  In situ high-temperature X-ray diffraction characterization of silver sulfide, Ag2S , 2011, Powder Diffraction.

[41]  Heng Wang,et al.  Convergence of electronic bands for high performance bulk thermoelectrics , 2011, Nature.

[42]  A. Maignan,et al.  Order–Disorder Transition in AgCrSe2: a New Route to Efficient Thermoelectrics , 2011 .

[43]  M. Kanatzidis.  Nanostructured Thermoelectrics: The New Paradigm?† , 2010 .

[44]  Gang Chen,et al.  Bulk nanostructured thermoelectric materials: current research and future prospects , 2009 .

[45]  Lidong Chen,et al.  Measuring Ionic Conductivity in Mixed Electron-ionic Conductors Based on the Ion-blocking Method , 2017 .