Research output: Contribution to journal › Article › peer-review
Narrow Band Gap Compounds with β-Pyrochlore Structure in the A2O-V2O5-2TeO3 (A=Rb, Cs) System. / Fukina, Diana G.; Shotina, Valeria A.; Boryakov, Aleksey V.; Telegin, Sergey V.; Volkova, Natalia S.; Koroleva, Aleksandra V.; Zhizhin, Evgeny V.; Suleimanov, Evgeny V.
In: European Journal of Inorganic Chemistry, Vol. 26, No. 10, e202200766, 06.02.2023.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Narrow Band Gap Compounds with β-Pyrochlore Structure in the A2O-V2O5-2TeO3 (A=Rb, Cs) System
AU - Fukina, Diana G.
AU - Shotina, Valeria A.
AU - Boryakov, Aleksey V.
AU - Telegin, Sergey V.
AU - Volkova, Natalia S.
AU - Koroleva, Aleksandra V.
AU - Zhizhin, Evgeny V.
AU - Suleimanov, Evgeny V.
PY - 2023/2/6
Y1 - 2023/2/6
N2 - Abstract Two new isostructural compounds with composition of Rb+V3+0.125V5+0.625Te6+1.25O6 and Cs+V3+0.125V5+0.625Te6+1.25O6 have been synthesized by solid-state reaction. The crystal structure has been determined by X-ray diffraction analysis using Rietveld refinement. Both compounds possess β-pyrochlore structure-type with cubic space group Fd-3 m (Z=8); the unit cell parameters: a=10.04120(27) Å for RbV0.75Te1.25O6 Å and a=10.09119(23) Å for CsV0.75Te1.25O6. The oxidation states of vanadium and tellurium have been confirmed by X-ray photoelectron spectroscopy. The compounds contain vanadium in mixed valence state (3+ and 5+). The compounds possess the unusual narrow band gap for oxide compounds – in the infrared (IR) range (∼0.6 eV). The schematic electronic structure of the compounds has been estimated using XPS, UPS and electronic conductivity data; however, the shifts of the top of the valence edge and the bottom of the conduction band in the water conditions have been calculated using theoretical approximation. The thermal behavior of obtained compounds has been studied by differential thermal analysis. RbV0.75Te1.25O6 and CsV0.75Te1.25O6 melts at low temperatures (∼500 °C) with decomposition and weight loss. The RbV0.75Te1.25O6 powder decomposes to amorphous phase, whereas CsV0.75Te1.25O6 transform into new β-pyrochlore compound with another composition.
AB - Abstract Two new isostructural compounds with composition of Rb+V3+0.125V5+0.625Te6+1.25O6 and Cs+V3+0.125V5+0.625Te6+1.25O6 have been synthesized by solid-state reaction. The crystal structure has been determined by X-ray diffraction analysis using Rietveld refinement. Both compounds possess β-pyrochlore structure-type with cubic space group Fd-3 m (Z=8); the unit cell parameters: a=10.04120(27) Å for RbV0.75Te1.25O6 Å and a=10.09119(23) Å for CsV0.75Te1.25O6. The oxidation states of vanadium and tellurium have been confirmed by X-ray photoelectron spectroscopy. The compounds contain vanadium in mixed valence state (3+ and 5+). The compounds possess the unusual narrow band gap for oxide compounds – in the infrared (IR) range (∼0.6 eV). The schematic electronic structure of the compounds has been estimated using XPS, UPS and electronic conductivity data; however, the shifts of the top of the valence edge and the bottom of the conduction band in the water conditions have been calculated using theoretical approximation. The thermal behavior of obtained compounds has been studied by differential thermal analysis. RbV0.75Te1.25O6 and CsV0.75Te1.25O6 melts at low temperatures (∼500 °C) with decomposition and weight loss. The RbV0.75Te1.25O6 powder decomposes to amorphous phase, whereas CsV0.75Te1.25O6 transform into new β-pyrochlore compound with another composition.
KW - Electronic structure
KW - Mixed-valent compounds
KW - Structure elucidation
KW - Thermal behavior
KW - Vanadium
UR - https://www.mendeley.com/catalogue/619b3a2e-5549-3686-ae82-4f46b3952da5/
U2 - 10.1002/ejic.202200766
DO - 10.1002/ejic.202200766
M3 - Article
VL - 26
JO - Berichte der deutschen chemischen Gesellschaft
JF - Berichte der deutschen chemischen Gesellschaft
SN - 0365-9496
IS - 10
M1 - e202200766
ER -
ID: 106593030