Magnetic properties of Cu2Cd1−zMnzGeSe4 and Cu2Cd1−zFezGeSe4 alloys

Engineering Transport Properties in Interconnected Enargite‐Stannite Type Cu2+xMn1−xGeS4 Nanocomposites

“…x Mn 1À x GeS 4 series are displayed in Figure 2a. For pristine sample (x = 0), the XRD pattern corresponds to the orthorhombic enargite-type phase (Pmn2 1 ), in agreement with previous studies on Cu 2 MnGeS 4 [4,[6][7][8] and other quaternary compounds Cu 2 MGeS 4 (M = Ni, Zn, Cd) and Cu 2 MSiS 4 (M = Mn, Fe, Zn, Cd, Hg). [4,[6][7][8]24] with traces of the NaCltype MnS phase.…”

“…With increasing x , additional reflections (Figure 2b) indicate the presence of a secondary phase possibly isostructural to some stannite‐type tetragonal phases ($${I\bar{4}2m)}$$ , i.e. Cu 2 M GeS 4 ( M =Fe, Co, Hg) and Cu 2 M SnS 4 ( M =Mn, Fe, Co, Zn, Cd, Hg) [4–8] . From x =0.2, the content of the assumed tetragonal phase increases at the expense of the orthorhombic phase, the content of which significantly decreases in x =0.4 and x =0.5 samples.…”

“…This is illustrated by the sulfides with generic formula Cu 2 MSnS 4 (with M = Mn, Fe, Co, Zn, Cd, Hg) and Cu 2 MGeS 4 (with M = Fe, Co, Hg) whose tetragonal structure (Figure 1a) is based on the sphalerite (zinc blende) sublattice, [4][5][6][7][8] and have been studied for their attractive thermoelectric performances, [9][10][11][12][13][14][15][16][17][18][19][20] while no evidence of high thermoelectric performances has been pointed out for the Cu 2 MGeS 4 sulfides with M = Mn, Ni, Zn, Cd, whose orthorhombic enargite structure (Figure 1b) is derived from the wurtzite. [4][5][6][7][8]21] Nevertheless, recent investigations by Tanimoto et al [22] have shown that the enargite-type sulfide Cu 3 P 1À x Ge x S 4 exhibits attractive thermoelectric performance with a figure of merit ZT of 0.5 at 673 K. Bearing in mind that the latter compound crystallizes in an orthorhombic enargite structure derived from the wurtzite, [23] we have embarked in the investigation of the Cu 2 MGeS 4 wurtzite derivatives. We report herein on the self-copper doped Cu 2 +…”

Magnetic properties and crystal structure of solid‐solution Cu2MnxFe1−xSnS4 chalcogenides with stannite‐type structure

“…In the last decades, the investigations on DMS have been focused to the important family of quaternary chalcogenides of M 2+ M 4+ Q 4 type, where M 1+ = Cu, Ag; M 2+ = Mn, Fe, Co, Ni, Zn, Cd; M 4+ = Si, Ge, Sn, Pb, and Q = S, Se, Te . The tetragonal crystal structure of these phases is based on zinc‐blende or an orthorhombic superstructure for wurtzite (known as wurtz–stannite), where each cation is tetrahedrally coordinated to four sulfur anions .…”

Magnetic properties for the Mn2GeTe4 compound

“…These studies have been extended to the investigation of the tetrahedrally coordinated I-III-VI 2 , II-III 2 -VI 4 and I 2 -II-IV-VI 4 compounds and alloys [4][5][6]. Another group of semiconducting materials, which would show similar tetrahedrally bounded form, are the II 2 -IV-VI 4 compounds.…”