On thermal stability of nanocrystalline Ag–Cu-S powders

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Publikace nespadá pod Ústav výpočetní techniky, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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SOPOUŠEK Jiří DRENČAKOVÁ Dáša BROŽ Pavel BURŠÍK Jiří ZEMANOVÁ Adéla ROUPCOVÁ Pavla

Rok publikování 2021
Druh Článek v odborném periodiku
Časopis / Zdroj Journal of Nanoparticle Research
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://link.springer.com/article/10.1007%2Fs11051-021-05244-y
Doi http://dx.doi.org/10.1007/s11051-021-05244-y
Klíčová slova Nanoparticles; Thermoelectrics; DSC; In situ XRPD; Stromayerite; Silver wires
Přiložené soubory
Popis The nanocrystalline semiconducting compounds based on the AgCuS system are considered as low-cost candidates of thermoelectric materials with improved thermal stability. The nanocrystalline Ag–Cu—S powders were prepared from metal nitrates and sulphur powder in tetraethylene glycol (TEG) solvent by reductive agent NaBH4. The crystallite sizes of the observed phases were in the range between 60 and 80 nm. The chemical compositions of the as-received samples were analysed by the ICP-AES method and their phase compositions were evaluated by XRPD. The investigation was supplemented by DSC and in situ HTXRD thermal analysis. A more detailed in situ experiment was performed for a sample containing ternary phases. The nucleation and growth of silver micro-wires were first observed on the substrate involving ternary phases at isothermal heat treatment. The formation of silver wires and semi-conductive ternary thermoelectric phase (stromayerite ?3) is explained by observed phase transformation. The obtained results are complemented by microscopy (LM, SEM, TEM).
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