The crystal structure of tetraindium triselenide

Abstract

The crystal structure of tetraindium triselenide (In4Se3) has been determined from three-dimensional X-ray diffractometer data, and refined to a final R = 0.06. The crystals are orthorhombic, space group Pnnm, with unit-cell dimensions, a= 15.297, b= 12.308, c=4.081 A. Z=4. The material is composed of endless interlocking chains running parallel to e, consisting of five-membered indium-selenium rings, the chains being cross-linked by strongly bound indium-indium-indium units to form a continuous sheet lying perpendicular to a. The structure contains the homonuclear triatomic cation (In3) s+.

The anisotropic band structure of layered In4Se3(001)

“…2, and scanning tunneling microscopy ͑STM͒. 20 The In 4 Se 3 crystal structure was found to be in agreement with prior structural determinations [17][18][19][20] with measured lattice constants of the crystal structure: a = 15.297͑1͒ Å, b = 12.308͑1͒ Å, and c = 4.0810͑5͒ Å in the orthorhombic space group P nnm obtained by x-ray diffraction using Cu K␣ radiation. These values are in agreement with the published values.…”

“…In 4 Se 3 is, in fact, dominated by ͑In 3 ͒ 5+ multivalent clusters bonded with selenium through ionic covalent bonds. The layered crystal structure of In 4 Se 3 allows one to obtain cleavage ͑001͒ surfaces, [16][17][18][19][20] as shown in Fig. 1.…”

“…16 The In 4 Se 3 semiconductor crystal forms a layered structure characterized by, in principle, weak interaction of van der Waals type between the layers and strong covalent-ionic interactions within the layer, but the ͑001͒ surface is not "smooth." The quasi-two-dimensionality ͑2D͒ of layered crystals and, consequently, absence of free unsaturated electron bonds on the cleavage surfaces, do not quite apply here as the layers are not perfectly flat but corrugated, [16][17][18][19][20] resulting in quasi-one-dimensional chain structures at the semiconducting In 4 Se 3 ͑001͒ surface. In 4 Se 3 is, in fact, dominated by ͑In 3 ͒ 5+ multivalent clusters bonded with selenium through ionic covalent bonds.…”

Rb6In2S6 und Rb4In2S5, zwei neue Thioindate mit isolierten und verknüpften [In2S6]6- Anionen / Rb6In2Se6 and Rb4ln2S5, Two NEW Thioindates with Isolated and Connected [In2S6]6- Anions Respectively

“…RblnS) entstehen, oder aber das kovalent gebundene InPaar (formal In2 4+ ) im In2S2 weiter reduziert werden, z.B. unter Bildung eines In3 5+ -Clusters, wie er in den Verbindungen In4Se3 [4] und In4Te3 [5] beobachtet wird.…”

Raman Spectra of In0.30Se0.70Amorphous Films

“…Indium and selenium combine into several stable chemical compounds each available in various crystalline modifications [1][2][3]. Amorphous films of In 1-x Sex alloys within a broad x range are available by thermal vacuum evaporation [4,5].…”