Semiconducting BiOCuSe Thermoelectrics and Its Metallic Derivative Bi₂YO₄Cu₂Se₂

Abstract

ZrCuSiAs-type mixed-anion oxychalcogenides and oxypnictides form a massive family of functional materials readily tailored to host diverse transport properties. Here we investigate semiconducting BiOCuSe, which has been considered as a promising candidate for intermediate-temperature thermoelectric applications, and its intergrowth derivative Bi 2 YO 4 Cu 2 Se 2 , by using X-ray absorption spectroscopy.

Magnetic order and phase transition in the iron oxysulfide La 2 O 2 Fe 2 OS 2

“…The ZrCuSiAs (or "1111") structure 9 (Figure 1a) adopted by LnFeAsO, BiCuOSe and LnCuOQ listed above is relatively simple but its building blocks, e.g. the fluorite-like oxide layers, or anti-fluorite-like transition metal layers, can be incorporated into more complex mixed anion materials to give new functional materials [10][11][12][13][14][15][16][17][18] and it's interesting to study the influence of the anion Q on the resulting properties and electronic structures.…”

Bi4O4Cu1.7Se2.7Cl0.3: Intergrowth of BiOCuSe and Bi2O2Se Stabilized by the Addition of a Third Anion

“…Bi 4 O 4 Cu 1.7 Se 2.7 Cl 0.3 is composed of two cationic Bi 2 O 2 2+ layers (a common structural motif, especially in Aurivillius phases), separated alternately by anionic Cu 1.7 Se 2 2.3– (an antifluorite-type layer formed of edge-sharing tetrahedra) and Se 0.7 Cl 0.3 1.7– layers (Figure ). The only other reported superstructure of Bi 2 O 2 Cu 2 Se 2 is the metallic compound Bi 2 YO 4 Cu 2 Se 2 . Considering these units individually, the structure can also be described as composed of alternating (Bi 2 O 2 Cu 1.7 Se 2 ) 0.3– and (Bi 2 O 2 Se 0.7 Cl 0.3 ) 0.3+ slabs, with each slab having a charge neutral analogue in the phases BiOCuSe and Bi 2 O 2 Se, respectively.…”

The magnetic and electronic properties of oxyselenides—influence of transition metal ions and lanthanides

“…M = Mn 2+ , Fe 2+ , Zn 2+ , Cd 2+ ) leads to half-occupancy of M Se 4 tetrahedra. These M 2+ sites can be occupied in a disordered fashion (as originally reported for CeMn 0.5 OSe) (Ijjaali et al, 2003) (Chou et al, 2015;Evans et al, 2002). Another possibility involves swapping the fluorite-like oxide layers for oxygendeficient perovskite-like A 2 MnO 2 oxide layers to give the Sr 2 MnO 2 Mn 2 Sb 2 -type structure (Fig.…”

“…These M 2+ sites can be occupied in a dis ordered fashion (as originally reported for CeMn 0.5 OSe) (Ijjaali et al 2003) but this partial occupancy often gives rise to ordering of the M 2+ ions. This cation ordering might follow a checkerboard arrangement (as in La 2 O 2 CdSe 2 (Hiramatsu et al 2004a(Hiramatsu et al , 2004b (Evans et al 2002, Chou et al 2015. Another possibility involves swapping the fluorite-like oxide layers for oxygen-deficient perovskite-like A 2 MnO 2 oxide layers to give the Sr 2 MnO 2 Mn 2 Sb 2 -type structure (figure 2(g)) (Brechtel et al 1979), variations of which are adopted by several oxychalcogenides (Otzschi et al 1990, Zhu 1997, 3.2.4.…”