Synthesis, structural characterization and differential thermal analysis of the quaternary compound Ag2MnSnS4

Abstract

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 nS4 crystallizes in the orthorhombic space group Pmn21, with unit cell parameters a = 8:1705(5) Å, b = 6:9413(5) Å, c = 6:6532(5) Å, and V = 377:33(5) Å3, 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: α ➝ α + α1 ➝ α1 ➝ α1 + β ➝ β ➝ 1 + L ➝ L, were α is the orthorhombic wurtzite-stannite Pmn21 structure; α1 is a high temperature modification; and β and β1 are the zinc-blende structure and its high-temperature modification, respectively.

Synthesis and Characterization of Ag2MnSnS4, a New Diamond‐like Semiconductor

“…However, as the diffraction pattern only slightly changes compared to the ambient temperature modification, a Rietveld refinement of this phase could not confirm this higher symmetry. Thus, phase transitions to a sphalerite‐type related phase as discussed in reference can be ruled out based on our high‐temperature diffraction studies.…”

“…7) with a = 6.651(1), b = 6.943(1), c = 10.536(2) Å, β = 129.15(1)°, V = 337.3(1) Å 3 , and Z = 2. An initial structure solution in the orthorhombic space group Pmn 2 1 resulted in unusually high R values (see also reference). Therefore, a symmetry reduction was considered, i.e., monoclinic symmetry with pseudo‐merohedral twinning similar to Li 2 ZnSnS 4 .…”

“…It has recently been mentioned also by Lekse , but no reasonable structure model is known to date . Very recently a structure determination was reported assuming orthorhombic symmetry and neglecting the monoclinic symmetry of the title compound thus leading to quite significantly enlarged R ‐values …”

Predicting diamond-like Co-based chalcogenides as unconventional high temperature superconductors

“…The diamond-like quaternary chalcogenides with formula I-II 2 -III-VI 4 and I 2 -II-IV-VI 4 can be considered as the derivatives of zinc-blende chalcogenides by sequential cation crosssubstitution [13,14]. There are a variety of possible compositions with I = Cu, Ag; II=Zn, Cd, Mn, Fe, Co; III=Al, Ga, In; IV=Si, Ge, Sn; VI = S, Se, Te [9,[13][14][15][16][17][18][19][20][21][22]. In the past, a great attention was paid to study Zn/Cd compounds for their semiconducting properties due to potential applications for photovoltaics [21], non-linear optics [14,22] and so on.…”

Optical fibre sensors for monitoring phase transitions in phase changing materials

“…Therefore, sole dependency on temperature measurement alone may lead to an incorrect estimation of the stored energy in the PCM, particularly in a large PCM-based energy storage system. To address this issue, several techniques such as differential scanning calorimetry (DSC) [8] and differential thermal analysis (DTA) [9] have been proposed to determine the phase state of PCM. However, these techniques are complex to operate which usually requires a skilled technician to carry out measurement and costly.…”