Coprecipitation synthesis and negative thermal expansion of NbVO5
Article
Article Title | Coprecipitation synthesis and negative thermal expansion of NbVO5 |
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ERA Journal ID | 1539 |
Article Category | Article |
Authors | Wang, Jinrui (Author), Deng, Jinxia (Author), Yu, Ranbo (Author), Chen, Jun (Author) and Xing, Xianran (Author) |
Journal Title | Dalton Transactions: an international journal of inorganic chemistry |
Journal Citation | 40 (13), pp. 3394-3397 |
Number of Pages | 4 |
Year | 2011 |
Place of Publication | United Kingdom |
ISSN | 1477-9226 |
1477-9234 | |
Digital Object Identifier (DOI) | https://doi.org/10.1039/c0dt01562h |
Web Address (URL) | http://pubs.rsc.org/en/Content/ArticleLanding/2011/DT/c0dt01562h#!divAbstract |
Abstract | 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. |
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; |
ANZSRC Field of Research 2020 | 340399. Macromolecular and materials chemistry not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Science and Technology of China, China |
University of Science and Technology Beijing, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4290/coprecipitation-synthesis-and-negative-thermal-expansion-of-nbvo5
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