Abstract
The title compound vanadium-tungsten mixed oxide bronze K0.399V2.623W0.377O7.5 was prepared by solid state reaction at 700°C in an evacuated silica ampoule. The single crystal K0.399V2.623W0.377O7.5 crystallizes in the monoclinic system, C2m (n°12) space group, with cell parameters a =15.7123 (3)Å, b =3.6796 (6)Å, c =10.2092 (2)Å and β=108.994°(4).This phase is isostructural to β-KxV2O5 called: Bannermanite family with x ranging between 0.19 and 0.4.The structure determination shows that the framework consists of tunnels which are created by the junction of two kind of connection by the edge and the corners of VO5 square pyramid and (VO6, MO6) octahedra. The “M” metal site is statistically occupied by 62.3% of vanadium and 37.7% of tungsten.The vanadium atoms are observed in irregular octahedra forming a short bond (1.6–1.67Å) related to the double bond character (V˭O). The structure refinement led to reliability factors R=0.046, Rw=0.0377 and GOF =1.23.According to the calculated values of the activation energy, the electrical conductivity measurement as function of various temperatures ranging (between 400 and 625K) and frequency (100–105Hz) shows a semi-conductor behavior for K0.399V2.623W0.377O7.5.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
