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Title: | Synthesis and characterization of sol–gel derived ZrO2 doped Al2O3 nanopowder |
Authors: | Sarkar, D Mohapatra, Deepak Ray, S Bhattacharyya, S Adak, S Mitra, N |
Keywords: | Alumina–zirconia Hydrogel Crystallization FTIR TEM |
Issue Date: | 2006 |
Publisher: | Elsevier |
Citation: | Ceramics International (Accepted) |
Abstract: | Al2O3–ZrO2 composite gel precursor powder containing 5–15 mol% ZrO2 was prepared by wet chemical route. The washed gel containing pseudoboehmite and amorphous zirconia was characterized with respect to DTA/TG, XRD and IR spectroscopy. The DTA/TG result indicates three-stage decomposition for pseudoboehmite and single stage decomposition for amorphous zirconia. In the calcined powder phase evolution of Al2O3 follows the sequence pseudoboehmite → bayerite → boehmite → γ-Al2O3 → θ-Al2O3 → α-Al2O3, while that of ZrO2 follows amorphous ZrO2 → t-ZrO2 → (t + m)ZrO2. FTIR studies revealed that the number of M–OH and M–O bond increase on increasing mol% of ZrO2 due to a change in the cationic charge of the composite powder. TEM photograph of calcined powder showed both dispersed nano-size spherical particle as well as agglomerated particles. EPMA confirmed the near uniform distribution of zirconia particles in the alumina matrix. |
Description: | Copyright for this article belongs to Elsevier doi:10.1016/j.ceramint.2006.05.002 |
URI: | http://hdl.handle.net/2080/339 |
Appears in Collections: | Journal Articles |
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