Preparation and characterisation of tungstate scheelite structured nanoparticles
A series of tungstate scheelite structured MWO 4 (M=Ca, Sr, Pb and Ba) were synthesised using the sucrose solution evaporation method. Characterisation of these materials revealed that nanoparticles were formed, with the calcination temperature >400°C. The nanoparticle powders formed are cry...
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| Main Authors: | , , , |
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| Format: | Article |
| Published: |
2011
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| Subjects: | |
| Online Access: | http://eprints.um.edu.my/6745/ |
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| Summary: | A series of tungstate scheelite structured MWO 4 (M=Ca, Sr, Pb and Ba) were synthesised using the sucrose solution evaporation method. Characterisation of these materials revealed that nanoparticles were formed, with the calcination temperature >400°C. The nanoparticle powders formed are crystalline and exist in its pure phase. It is found that the degree of crystalline products is low with the decrease in ionic radius (Ca<Sr<Pb<Ba), and also, diffraction peaks at the plane (112), (004) and (204) are shifted to lower angles (2θ) in accordance to the reduction in dhkl spacing. The S BET value of CaWO 4 gave the highest surface area (277·53 m 2 g -1) in the observed nanosize grain obtained from the field emission scanning electron microscopy image. |
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