TEM Characterization of Nanostructured MgAl2O4 Synthesized by a Direct Conversion Process from γ-Al2O3
Nanostructured MgAl2O4 spinel was synthesized by a direct conversion process from cubic γ‐Al2O3. The effect of post‐annealing temperature (300°, 500°, and 800°C) on MgAl2O4 phase formation was investigated using transmission electron microscopy, selected area electron diffraction (SAED), electron en...
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| Veröffentlicht in: | Journal of the American Ceramic Society 2006-07, Vol.89 (7), p.2279-2285 |
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| creator | Al-Sharab, Jafar F. Cosandey, Frederic Singhal, Amit Skandan, Ganesh Bentley, James |
| description | Nanostructured MgAl2O4 spinel was synthesized by a direct conversion process from cubic γ‐Al2O3. The effect of post‐annealing temperature (300°, 500°, and 800°C) on MgAl2O4 phase formation was investigated using transmission electron microscopy, selected area electron diffraction (SAED), electron energy loss spectroscopy (EELS), and energy‐dispersive spectroscopy (EDS). Relative diffraction intensities as well as lattice parameter measurements from SAED revealed that MgAl2O4 spinel structure starts forming at temperatures as low as 300°C. EELS and EDS spectrum images also revealed an increase in elemental homogeneity with increasing annealing temperature. The degree of ordering of Mg and Al between octahedral and tetrahedral sites has been determined from relative diffraction intensities. Results show that annealing to 800°C leads to a spinel phase with an order parameter of 0.78. |
| doi_str_mv | 10.1111/j.1551-2916.2006.01020.x |
| format | Article |
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(ORNL), Oak Ridge, TN (United States)</creatorcontrib><description>Nanostructured MgAl2O4 spinel was synthesized by a direct conversion process from cubic γ‐Al2O3. The effect of post‐annealing temperature (300°, 500°, and 800°C) on MgAl2O4 phase formation was investigated using transmission electron microscopy, selected area electron diffraction (SAED), electron energy loss spectroscopy (EELS), and energy‐dispersive spectroscopy (EDS). Relative diffraction intensities as well as lattice parameter measurements from SAED revealed that MgAl2O4 spinel structure starts forming at temperatures as low as 300°C. EELS and EDS spectrum images also revealed an increase in elemental homogeneity with increasing annealing temperature. The degree of ordering of Mg and Al between octahedral and tetrahedral sites has been determined from relative diffraction intensities. Results show that annealing to 800°C leads to a spinel phase with an order parameter of 0.78.</description><identifier>ISSN: 0002-7820</identifier><identifier>EISSN: 1551-2916</identifier><identifier>DOI: 10.1111/j.1551-2916.2006.01020.x</identifier><identifier>CODEN: JACTAW</identifier><language>eng</language><publisher>Malden, USA: Blackwell Publishing Inc</publisher><subject>ANNEALING ; Applied sciences ; Building materials. Ceramics. 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(ORNL), Oak Ridge, TN (United States)</creatorcontrib><title>TEM Characterization of Nanostructured MgAl2O4 Synthesized by a Direct Conversion Process from γ-Al2O3</title><title>Journal of the American Ceramic Society</title><description>Nanostructured MgAl2O4 spinel was synthesized by a direct conversion process from cubic γ‐Al2O3. The effect of post‐annealing temperature (300°, 500°, and 800°C) on MgAl2O4 phase formation was investigated using transmission electron microscopy, selected area electron diffraction (SAED), electron energy loss spectroscopy (EELS), and energy‐dispersive spectroscopy (EDS). Relative diffraction intensities as well as lattice parameter measurements from SAED revealed that MgAl2O4 spinel structure starts forming at temperatures as low as 300°C. EELS and EDS spectrum images also revealed an increase in elemental homogeneity with increasing annealing temperature. The degree of ordering of Mg and Al between octahedral and tetrahedral sites has been determined from relative diffraction intensities. Results show that annealing to 800°C leads to a spinel phase with an order parameter of 0.78.</description><subject>ANNEALING</subject><subject>Applied sciences</subject><subject>Building materials. Ceramics. Glasses</subject><subject>Ceramic industries</subject><subject>Chemical industry and chemicals</subject><subject>DIFFRACTION</subject><subject>ELECTRON DIFFRACTION</subject><subject>ELECTRONS</subject><subject>ENERGY-LOSS SPECTROSCOPY</subject><subject>Exact sciences and technology</subject><subject>LATTICE PARAMETERS</subject><subject>MATERIALS SCIENCE</subject><subject>Miscellaneous</subject><subject>ORDER PARAMETERS</subject><subject>SPECTROSCOPY</subject><subject>SPINELS</subject><subject>Technical ceramics</subject><subject>TRANSMISSION ELECTRON MICROSCOPY</subject><issn>0002-7820</issn><issn>1551-2916</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNqNkctuEzEUhi0EEqHtO1hIsJupL2N7vEJhCClVb1KLWFqOx24cJjOt7UDS1-I9eCY8TVW29cY-Pt_5daQPAIhRifM5XpWYMVwQiXlJEOIlwoigcvsKTJ4br8EEIUQKURP0FryLcZVLLOtqAm5vZuewWeqgTbLBP-jkhx4ODl7ofogpbEzaBNvC89tpRy4reL3r09JG_5D_Fjuo4RcfrEmwGfpfNsRx-CoMxsYIXRjW8O-fYhykh-CN0120R0_3Afj-dXbTnBRnl_NvzfSs8ETWqJC4Fa1AwjEnOF0wZ0nFjahaRilGLbe61po5Y3GFhdFUMoIXDlu-aCvLZE0PwPt9bl7eq2h8smZphr7PSyqMEOWEZ-jjHroLw_3GxqTWPhrbdbq3wyYqImklZE1eACKJ6opl8MMTqKPRnQu6Nz6qu-DXOuwUFjIHUpm5T3vut-_s7n8fqVGmWqnRmRqdqVGmepSptup02swe3zmh2Cf4mOz2OUGHn4oLKpj6cTFXjSTz-fXnWl3Rf93Bo3w</recordid><startdate>200607</startdate><enddate>200607</enddate><creator>Al-Sharab, Jafar F.</creator><creator>Cosandey, Frederic</creator><creator>Singhal, Amit</creator><creator>Skandan, Ganesh</creator><creator>Bentley, James</creator><general>Blackwell Publishing Inc</general><general>Blackwell</general><scope>BSCLL</scope><scope>IQODW</scope><scope>7QQ</scope><scope>8FD</scope><scope>JG9</scope><scope>7QF</scope><scope>OTOTI</scope></search><sort><creationdate>200607</creationdate><title>TEM Characterization of Nanostructured MgAl2O4 Synthesized by a Direct Conversion Process from γ-Al2O3</title><author>Al-Sharab, Jafar F. ; Cosandey, Frederic ; Singhal, Amit ; Skandan, Ganesh ; Bentley, James</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i2980-91d7d707f5f763b5fe246c74d53310d6ea8aa5fce1417ca39521bf1e6bd4e5983</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>ANNEALING</topic><topic>Applied sciences</topic><topic>Building materials. 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(ORNL), Oak Ridge, TN (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>TEM Characterization of Nanostructured MgAl2O4 Synthesized by a Direct Conversion Process from γ-Al2O3</atitle><jtitle>Journal of the American Ceramic Society</jtitle><date>2006-07</date><risdate>2006</risdate><volume>89</volume><issue>7</issue><spage>2279</spage><epage>2285</epage><pages>2279-2285</pages><issn>0002-7820</issn><eissn>1551-2916</eissn><coden>JACTAW</coden><abstract>Nanostructured MgAl2O4 spinel was synthesized by a direct conversion process from cubic γ‐Al2O3. The effect of post‐annealing temperature (300°, 500°, and 800°C) on MgAl2O4 phase formation was investigated using transmission electron microscopy, selected area electron diffraction (SAED), electron energy loss spectroscopy (EELS), and energy‐dispersive spectroscopy (EDS). Relative diffraction intensities as well as lattice parameter measurements from SAED revealed that MgAl2O4 spinel structure starts forming at temperatures as low as 300°C. EELS and EDS spectrum images also revealed an increase in elemental homogeneity with increasing annealing temperature. The degree of ordering of Mg and Al between octahedral and tetrahedral sites has been determined from relative diffraction intensities. Results show that annealing to 800°C leads to a spinel phase with an order parameter of 0.78.</abstract><cop>Malden, USA</cop><pub>Blackwell Publishing Inc</pub><doi>10.1111/j.1551-2916.2006.01020.x</doi><tpages>7</tpages></addata></record> |
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| subjects | ANNEALING Applied sciences Building materials. Ceramics. Glasses Ceramic industries Chemical industry and chemicals DIFFRACTION ELECTRON DIFFRACTION ELECTRONS ENERGY-LOSS SPECTROSCOPY Exact sciences and technology LATTICE PARAMETERS MATERIALS SCIENCE Miscellaneous ORDER PARAMETERS SPECTROSCOPY SPINELS Technical ceramics TRANSMISSION ELECTRON MICROSCOPY |
| title | TEM Characterization of Nanostructured MgAl2O4 Synthesized by a Direct Conversion Process from γ-Al2O3 |
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