Crystallization of magnesium niobate from mechanochemically derived amorphous phase |
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Authors: | L B Kong J Ma H Huang R F Zhang |
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Affiliation: | School of Materials Engineering, Nanyang Technological University, Singapore 639798, Singapore |
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Abstract: | The effect of high-energy ball milling and subsequent annealing on the mixture of MgO and Nb2O5 has been investigated. X-ray diffraction (XRD) measurement indicates that an amorphous phase is produced after milling for 5 h, while traces of MgNb2O6 crystallized from the amorphous phase during prolonged milling. Significant crystallization of MgNb2O6 from the amorphous state is observed after annealing at 500 °C, while the reaction of the remaining MgO and Nb2O5 does not take place at this temperature. Single phase MgNb2O6 can be achieved for all the milled samples at 700 °C. No significant grain growth is observed when the milled powders were annealed at temperature below 900 °C. Almost fully dense MgNb2O6 ceramics are obtained after annealing at 1100 °C from the as-milled powders. |
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Keywords: | Oxide materials Ceramics Mechanical alloying X-ray diffraction SEM |
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