Synthesis and crystal chemical evolution of fresnoite powders
(Ba,Sr)2TiSi2O8 fresnoite powders were prepared via a Pechini process in which citric acid and ethylene glycol were used as complexing agents. The resulting gel contained a homogeneous distribution of the metal ions that suppressed the formation of (Ba,Sr)TiO3 perovskite as a secondary phase during...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/95818 http://hdl.handle.net/10220/11273 |
| _version_ | 1826112971934269440 |
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| author | Wong, Chui L. Madhavi, Srinivasan Phonthammachai, N. White, Timothy John |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Wong, Chui L. Madhavi, Srinivasan Phonthammachai, N. White, Timothy John |
| author_sort | Wong, Chui L. |
| collection | NTU |
| description | (Ba,Sr)2TiSi2O8 fresnoite powders were prepared via a Pechini process in which citric acid and ethylene glycol were used as complexing agents. The resulting gel contained a homogeneous distribution of the metal ions that suppressed the formation of (Ba,Sr)TiO3 perovskite as a secondary phase during calcination. Phase development was examined as by isochronal and isothermal reaction analysis. A combination of thermo- and differential gravimetric analysis (TGA–DGA), quantitative X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed that calcination at 900 °C/12 h yielded finely crystalline (∼70 nm) Ba2TiSi2O8 (BTS) and Sr2TiSi2O8 (STS). The endmembers and compositional intermediates crystallized directly from the Pechini resin and indirectly through reaction of (Ba,Sr)CO3, (Ba,Sr)TiO3 and a silica-rich glass intermediates. This new method for preparing fresnoite yields materials suitable for consolidation as dense monolithic dielectrics or for use as high surface area catalytic powders. |
| first_indexed | 2024-10-01T03:15:33Z |
| format | Journal Article |
| id | ntu-10356/95818 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:15:33Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/958182020-06-01T10:26:36Z Synthesis and crystal chemical evolution of fresnoite powders Wong, Chui L. Madhavi, Srinivasan Phonthammachai, N. White, Timothy John School of Materials Science & Engineering (Ba,Sr)2TiSi2O8 fresnoite powders were prepared via a Pechini process in which citric acid and ethylene glycol were used as complexing agents. The resulting gel contained a homogeneous distribution of the metal ions that suppressed the formation of (Ba,Sr)TiO3 perovskite as a secondary phase during calcination. Phase development was examined as by isochronal and isothermal reaction analysis. A combination of thermo- and differential gravimetric analysis (TGA–DGA), quantitative X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed that calcination at 900 °C/12 h yielded finely crystalline (∼70 nm) Ba2TiSi2O8 (BTS) and Sr2TiSi2O8 (STS). The endmembers and compositional intermediates crystallized directly from the Pechini resin and indirectly through reaction of (Ba,Sr)CO3, (Ba,Sr)TiO3 and a silica-rich glass intermediates. This new method for preparing fresnoite yields materials suitable for consolidation as dense monolithic dielectrics or for use as high surface area catalytic powders. 2013-07-12T02:54:20Z 2019-12-06T19:22:01Z 2013-07-12T02:54:20Z 2019-12-06T19:22:01Z 2012 2012 Journal Article Wong, C. L., Madhavi, S., Phonthammachai, N., & White, T. J. (2012). Synthesis and crystal chemical evolution of fresnoite powders. Journal of solid state chemistry, 187, 165-171. 0022-4596 https://hdl.handle.net/10356/95818 http://hdl.handle.net/10220/11273 10.1016/j.jssc.2011.12.031 en Journal of solid state chemistry © 2012 Elsevier Inc. |
| spellingShingle | Wong, Chui L. Madhavi, Srinivasan Phonthammachai, N. White, Timothy John Synthesis and crystal chemical evolution of fresnoite powders |
| title | Synthesis and crystal chemical evolution of fresnoite powders |
| title_full | Synthesis and crystal chemical evolution of fresnoite powders |
| title_fullStr | Synthesis and crystal chemical evolution of fresnoite powders |
| title_full_unstemmed | Synthesis and crystal chemical evolution of fresnoite powders |
| title_short | Synthesis and crystal chemical evolution of fresnoite powders |
| title_sort | synthesis and crystal chemical evolution of fresnoite powders |
| url | https://hdl.handle.net/10356/95818 http://hdl.handle.net/10220/11273 |
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