Synthesis and characterization of three-dimensionally ordered macroporous ternary oxide
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-B4-10, 50 Nanyang Avenue, Singapore 639798 (Singapore)
A three-dimensionally ordered macroporous (3DOM) ternary oxide, CsAlTiO{sub 4}, with a framework related to 'stuffed-tridymite' has been synthesized at temperatures 500-700 deg. C using a sol-gel precursor solution and templating with polystyrene spheres. The 3DOM material displayed pore diameters of 0.5-0.8 {mu}m with the walls composed of anhedral and acicular CsAlTiO{sub 4} crystals whose dimensions ranged from 16 to 25 nm. Microanalysis confirmed near-stoichiometric proportions (1:1:1) of Cs, Al and Ti. The effect of sintering temperature on the macroporous structure and on the CsAlTiO{sub 4} walls was studied. As the sintering temperature increased from 500 to 600 deg. C the unit cell parameters varied through dilation (a and b) and contraction (c-axis), followed by a reversal of these trends from 700 to 900 deg. C. This behaviour in non-equilibrated CsAlTiO{sub 4} can be attributed to distortion of the (Al, Ti)O{sub 4} tetrahedral framework, however at the highest temperature the cell constants stabilized close to those reported for single crystal CsAlTiO{sub 4}. X-ray amorphous content was significant in all materials varying from 73 wt% after 500 deg. C and reducing to 44 wt% at 900 deg. C.
- OSTI ID:
- 20784931
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 3; Other Information: DOI: 10.1016/j.jssc.2005.12.010; PII: S0022-4596(05)00601-8; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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