CINECA IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishThe vanadium–molybdenum mixed oxide bronzes of composition K0.23(V5.35Mo0.65)O15 and K0.32(V5.48Mo0.52)O15 have a monoclinic structure with s.g. C2/m, Z ¼ 2, and unit-cell dimensions a ¼ 15.436(2), b ¼ 3.6527(5), c ¼ 10.150(1)A ˚ , b ¼ 108.604(3)1 and a ¼ 15.452(2), b ¼ 3.6502(5), c ¼ 10.142(1)A ˚ , b ¼ 109.168(3)1, respectively, as determined by single-crystal X-ray diffraction. These compounds show the b-NaxV6O15 tunnel structure, which is isostructural with bannermanite, natural sodium–potassium vanadate. Structure refinements from diffracted intensities collected in the 2–381y range converged to final R ¼ 5.58% and 7.48% for the two crystals, respectively. The V atoms are distributed on three different crystallographic sites. Partial substitution of V with Mo occurs in only one of these positions. Oxygen atoms involved in vanadyl groups point toward the tunnels. The K ions in the tunnels are coordinated by seven oxygen atoms. The alkali metal content in these crystals is much lower than the solubility limit found for the analogous Na containing compound.
Scheda prodotto non validato
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
| Titolo: | Low-alkali metal content in beta-vanadium mixed bronzes: the crystal structures of β-Kx(V,Mo)6O15 (x = 0.23 and 0.32) by single-crystal X-ray diffraction |
| Autori: | |
| Data di pubblicazione: | 2007 |
| Rivista: | |
| Abstract: | The vanadium–molybdenum mixed oxide bronzes of composition K0.23(V5.35Mo0.65)O15 and K0.32(V5.48Mo0.52)O15 have a monoclinic structure with s.g. C2/m, Z ¼ 2, and unit-cell dimensions a ¼ 15.436(2), b ¼ 3.6527(5), c ¼ 10.150(1)A ˚ , b ¼ 108.604(3)1 and a ¼ 15.452(2), b ¼ 3.6502(5), c ¼ 10.142(1)A ˚ , b ¼ 109.168(3)1, respectively, as determined by single-crystal X-ray diffraction. These compounds show the b-NaxV6O15 tunnel structure, which is isostructural with bannermanite, natural sodium–potassium vanadate. Structure refinements from diffracted intensities collected in the 2–381y range converged to final R ¼ 5.58% and 7.48% for the two crystals, respectively. The V atoms are distributed on three different crystallographic sites. Partial substitution of V with Mo occurs in only one of these positions. Oxygen atoms involved in vanadyl groups point toward the tunnels. The K ions in the tunnels are coordinated by seven oxygen atoms. The alkali metal content in these crystals is much lower than the solubility limit found for the analogous Na containing compound. |
| Handle: | http://hdl.handle.net/11571/35035 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
http://hdl.handle.net/11571/35035
Copyright © 2021