Formation of SrBi{sub 2}Ta{sub 2}O{sub 9}: Part II. Evidence of a bismuth-deficient pyrochlore phase

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Journal of Materials Research

DOI:https://doi.org/10.1557/JMR.1996.0290· OSTI ID:383761

Rodriguez, M A; Boyle, T J; Hernandez, B A; Buchheit, C D; Eatough, M O ^[1]

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1. Sandia National Laboratories, P.O. Box 5800, MS 1405, Albuquerque, New Mexico 87185-1405 (United States)

A bismuth-deficient pyrochlore phase has been observed in both powder and film samples fired at 775{degree}C. The estimated stoichiometry of this pyrochlore (based on calculated diffraction patterns) was Sr{sub 0.2}(Sr{sub 0.5}Bi{sub 0.7})Ta{sub 2}O{sub 6.75}. This bismuth-deficient pyrochlore phase may be considered deleterious to the formation of the SrBi{sub 2}Ta{sub 2}O{sub 9} {open_quote}{open_quote}SBT{close_quote}{close_quote} ferroelectric compound since a significant presence of this pyrochlore compound implies a large deviation from the desired cation ratios. Additionally, films prepared on platinized silicon substrates indicate the SBT phase formation may be encouraged by the substrate; there appears to be some 00{ital l} preferential orientation for stoichiometric SBT thin films. {copyright} {ital 1996 Materials Research Society.}

• Research Organization: Sandia National Laboratory
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 383761
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 9 Vol. 11; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CERAMICS
FERROELECTRIC MATERIALS
PHASE STUDIES
POWDERS
SOL-GEL PROCESS
STOICHIOMETRY
STRONTIUM OXIDES
SUBSTRATES
TANTALUM OXIDES
THIN FILMS