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- W2022154306 abstract "Abstract Controlled hydrolysis and condensation of a mixture of vanadyl-tris- n -propoxide, VO(OPr) 3 , and niobium pentaethoxide, [Nb(OEt) 5 ] 2 , at 5 °C in propanol yields clear and transparent gels in which the ratio of V:Nb is 1:1, 1:4.5 or 1:9. Oxalic acid and low temperatures are used to slow down the rate of condensation processes. At 800 °C, the thermal decomposition of a gel with the composition 1:9 forms a thermodynamically metastable, new phase of the composition VNb 9 O 25 . At lower temperatures, metastable solid solutions with TT-Nb 2 O 5 structure (600 °C) and M-Nb 2 O 5 structure (700 °C) are formed from the amorphous xerogel. The new VNb 9 O 25 phase is structurally related to M-Nb 2 O 5 . The solid solution with M-Nb 2 O 5 structure acts structure directing, leading preferentially to a monoclinic low-temperature form of VNb 9 O 25 . The full transformation of this metastable phase to the well known tetragonal VNb 9 O 25 requires a annealing temperature of about 1000 °C." @default.
- W2022154306 created "2016-06-24" @default.
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- W2022154306 date "2006-08-01" @default.
- W2022154306 modified "2023-09-27" @default.
- W2022154306 title "Synthesis of transparent mixed vanadia/niobia gels and their decomposition to a new metastable VNb9O25 phase" @default.
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- W2022154306 doi "https://doi.org/10.1016/j.tca.2006.06.003" @default.
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