Nano Archive

Synthesis, formation and characterization of Mg4Nb2O9 powders

Ananta, S (2004) Synthesis, formation and characterization of Mg4Nb2O9 powders. Materials Letters, 58 (20). 2530 - 2536.

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Magnesium niobate (Mg4Nb2O9) powders have been prepared and characterized by thermogravimetric and differential thermal analysis (TG–DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) techniques. The effect of calcination temperature, dwell time and heating/cooling rates on phase formation, morphology and chemical composition of the powders are examined. The calcination temperature and dwell time have been found to have a pronounced effect on the phase formation and morphology of the calcined magnesium niobate powders. It has been found that the minor phases of nano-sized MgO inclusion and the columbite-type MgNb2O6 phase tend to form together with the corundum-type Mg4Nb2O9 phase, depending on calcination conditions. It is seen that optimisation of calcination conditions can lead to a single-phase Mg4Nb2O9 in a hexagonal phase.

Item Type:Article
Uncontrolled Keywords:Magnesium niobate; Mg4Nb2O9; Powder synthesis; Phase formation; Calcination; X-ray diffraction
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:6876
Deposited By:SPI
Deposited On:24 Sep 2009 17:24
Last Modified:24 Sep 2009 17:24

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