Coprecipitation synthesis and negative thermal expansion of NbVO5

Wang, Jinrui and Deng, Jinxia and Yu, Ranbo and Chen, Jun and Xing, Xianran (2011) Coprecipitation synthesis and negative thermal expansion of NbVO5. Dalton Transactions, 40 (13). pp. 3394-3397. ISSN 1477-9226


We develop a coprecipitation synthesis route to prepare NbVO 5 with simple oxide Nb2O5 and NH4VO3 as starting materials. No metal alkoxide or organometallic substance was used in the process. Nano-crystal NbVO5 was obtained by calcination of the coprecipitates at 550°C for 2 h. DSC/TG and XRD investigations indicate that the target compound NbVO5 is completely formed up to 504.5°C and is thermally stable below 658°C. Rietveld XRD refinements give an orthorhombic structure with space group Pnma and lattice parameters, a = 11.8453(2), b = 5.5126(3) and c = 6.9212(2) Å, respectively. In particular, HTXRD determinations show a negative thermal expansion in NbVO 5 with a TEC of -6.63 × 10 -6 °C -1 in the temperature range of RT-600 °C. This fact is ascribed to the tilting of NbO6 octahedra and VO4 tetrahedra in the flexible framework structure. The present synthesis route is facile and easy to be extended to prepare analogues such as TaVO 5, etc.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 27 Sep 2017 01:38
Last Modified: 27 Sep 2017 05:39
Uncontrolled Keywords: co-precipitates; coprecipitation synthesis; flexible framework; lattice parameters; metal alkoxides; negative thermal expansion; orthorhombic structures; Rietveld; space groups; XRD; Bismuth; Boron; Cadmium; Cobalt; Mercury; Niobium; Selenium; Silicon; Tellurium; strength of building materials; mechanical properties; thermoelectric energy;
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials
Fields of Research (2020): 34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340399 Macromolecular and materials chemistry not elsewhere classified
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
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