Synthesis and characterization of nanosized SrBi{sub 2}Ta{sub 2}O{sub 9} powder by a novel sol-gel process
Chemically homogeneous SrBi{sub 2}Ta{sub 2}O{sub 9} (SBT) sol was synthesized using ethoxy tantalum, strontium acetate, and bismuth subnitrate as starting materials, methoxyethylene as a solvent and acetic acid (HOAc) as a catalyst. Single-phased perovskite phase SBT ferroelectric ultrafine powder was obtained after the dried gel was treated at 350 deg. C for 30 min and calcined at 800 deg. C for 1 h. FT-IR, XRD, TEM and TG-DTA were employed to investigate the transformation processes of sol to gel and gel to ultrafine SBT powder. Acetic acid not only acts as an acid catalyst, but also changes the alkoxide precursor as a ligand at a molecular level. Bidentate acetates replace OR groups and are directly bounded to the tantalum, leading to the formation of Ta (OR){sub x}(OAc){sub 5-x}. The perovskite SBT phase formed via intermediate phase Bi{sub 3}TaO{sub 7} and a Bi-deficient pyrocholore phase.
- OSTI ID:
- 20883118
- Journal Information:
- Materials Research Bulletin, Vol. 37, Issue 15; Other Information: PII: S0025540801007863; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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