Resumo

DELGADO, G.E. et al. Synthesis, structural characterization and differential thermal analysis of the quaternary compound Ag₂MnSnS₄. Rev. mex. fis. [online]. 2018, vol.64, n.3, pp.216-221. ISSN 0035-001X.

The quaternary chalcogenide compound Ag2MnSnS4 belonging to the system I2-II-IV-VI4 and synthesized by the melt and anneal technique, was characterized by Rietveld refinement of the powder X-ray diffraction data and differential thermal analysis (DTA). It was found that Ag2MnSnS4 crystallizes in the orthorhombic space group $Pmn{2}_1$, with unit cell parameters $a=8.1705\left(5\right)\mathrm{}\mathrm{\AA }$, $b=6.9413\left(5\right)\mathrm{\AA }$, $c=6.6532\left(5\right)\mathrm{\AA }$, and $V=377.33\left(5\right){\mathrm{\AA }}^3$, in a wurtzite-stannite structure. The DTA indicates that this compound melts at 790°C and that the phase relations which occurs in the material would be: $\alpha \to \alpha +{\alpha }_1\to {\alpha }_1\to {\alpha }_1+\beta \to \beta \to {\beta }_1+L\to L$, were $\alpha$ is the orthorhombic wurtzite-stannite $Pmn{2}_1$ structure; ${\alpha }_1$ is a high temperature modification; and $\beta$ and ${\beta }_1$ are the zinc-blende structure and its high-temperature modification, respectively.

Palavras-chave : Chalcogenide; semiconductor; chemical synthesis; X-ray powder diffraction; crystal structure; differential thermal analysis.

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