Influence of calcination conditions on phase formation and particle size of indium niobate powders synthesized by the solid-state reaction
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A wolframite-type phase of indium niobate, InNbO4, has been synthesized by a solid-state reaction via a rapid vibro-milling technique. The formation of the InNbO4 phase in the calcined powders has been investigated as a function of calcination conditions by TG-DTA and XRD techniques. Morphology, particle size and chemical composition have been determined via a combination of SEM and EDX techniques. Single-phase InNbO4 powders have been obtained successfully for calcination condition of 900 °C for 4 h or 950 °C for 2 h with heating/cooling rates of 30 °C/min. Higher temperatures and longer dwell times clearly favoured particle growth and the formation of large and hard agglomerates.
KeywordsCalcination Dwell Time Calcination Temperature Mixed Oxide In2O3
We thank the Thailand Research Fund (TRF) and the Commission on Higher Education (CHE), Graduate School and Faculty of Science, Chiang Mai University for all supports.
- 1.Keller C, Anorg Z (1962) Chem 318:89Google Scholar
- 8.Xu Y (1991) Ferroelectric materials and their applications. Elsevier Science, Amsterdam, The NetherlandsGoogle Scholar
- 21.Powder Diffraction File No. 71-2195 (2000) International Centre for Diffraction Data, Newton Square, PAGoogle Scholar
- 22.Powder Diffraction File No. 30-873 (2000) International Centre for Diffraction Data, Newton Square, PAGoogle Scholar
- 23.Powder Diffraction File No. 83-1780 (2000) International Centre for Diffraction Data, Newton Square, PAGoogle Scholar
- 25.Youmee P, Phanichphant S, Ananta S, Heimann RB (2001) Ceram Forum Int DKG 78:E48Google Scholar
- 29.Powder Diffraction File No. 25-384 (2000) International Centre for Diffraction Data, Newton Square, PAGoogle Scholar
- 31.Powder Diffraction File No. 33-619 (2000) International Centre for Diffraction Data, Newton Square, PAGoogle Scholar
- 32.Reed JS (1995) Principles of ceramics processing, 2nd edn. Wiley, New YorkGoogle Scholar