Graphite immobilisation in iron phosphate glass composite materials produced by microwave and conventional sintering routes
An investigation of microwave and conventional processing of iron phosphate based graphite glass composite materials as potential wasteforms for the immobilisation of irradiated graphite is reported. For the base iron phosphate glass, full reaction of the raw materials and formation of a glass melt...
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| Main Authors: | , , , |
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| Format: | Article |
| Published: |
Elsevier
2015
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1016/j.jnucmat.2014.08.031 http://dx.doi.org/10.1016/j.jnucmat.2014.08.031 http://eprints.uthm.edu.my/7441/1/mohd_zul_hilmi_mayzan_U.pdf |
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| Summary: | An investigation of microwave and conventional processing of iron phosphate based graphite glass composite
materials as potential wasteforms for the immobilisation of irradiated graphite is reported. For the
base iron phosphate glass, full reaction of the raw materials and formation of a glass melt occurs with
consequent removal of porosity at 8 min microwave processing. When graphite is present, iron phosphate
crystalline phases are formed with higher levels of residual porosity than in the sample prepared
using conventional sintering under argon. It is found that graphite reacts with the microwave field when
in powder form but this reaction is minimised when the graphite is incorporated into a pellet, and that
the graphite also impedes sintering of the glass. Mössbauer spectroscopy indicates that reduction of iron
also occurs with concomitant graphite oxidation. Conventionally sintered samples had lower porosities
than the equivalent microwaved ones. |
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