| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1329859 | Journal of Solid State Chemistry | 2014 | 5 Pages |
•A new quaternary layered selenide NaCuMnSe2 is synthesized.•All the compositions show semiconducting nature, whereas the Seebeck coefficient increases gradually over the entire measured temperature range.•Conduction mechanism transforms from thermally activated behavior to 2D variable range hopping with increase in copper concentration.
Synthesis and high temperature transport properties of NaCu1+xMn1−xSe2, (x=0−0.75) a new quaternary layered selenide, are reported. NaCuMnSe2 crystallizes in a trigonal unit cell with space group of P-3m1 (a=4.1276 Å, c=7.1253 Å). The isovalent substitution of Mn2+ by Cu2+ is carried out. All the compositions show semiconducting nature, whereas the Seebeck coefficient increases gradually over the entire measured temperature range. Compositions with x=0 and 0.025 follow thermally activated behavior. With increase in copper concentration the conduction mechanism transforms to 2D variable range hopping (VRH) for x=0.05 and 0.075.
Graphical abstractCrystal structure of NaCuMnSe2.Figure optionsDownload full-size imageDownload as PowerPoint slide
