Fluctuation-swamped discontinuous phase changes in lightly doped ferroelectric barium titanate

C N W Darlington, R J Cernik

    Research output: Contribution to journalArticlepeer-review

    Abstract

    X-ray scattering expts. on lightly doped powders of BaTiO3 using the diffractometer on line 9.1, SRS, Daresbury, have been extended to investigate transitions in barium-rich solid solns. of (Ba,Sr)TiO3 and (Ba,Pb)TiO3. Samples studied earlier were "impure systems", that is pure material doped with ions with a valency different from those they replaced. Qual. the ferroelec. transitions near 130° in the solid solns. and impure systems are similar (they are "smeared out" and appear continuous, but are in fact fluctuation-swamped, discontinuous changes). There are important quant. differences between the transitions in the two categories. Anal. shows that impure systems behave as "host" (pure BaTiO3) plus point-like defects, with parameters independent of the dopant and concn. However, for (Ba,Sr)TiO3 the parameters describing the crit. behavior depend on the concn. of Sr. [on SciFinder(R)]
    Original languageEnglish
    Pages (from-to)4387-98
    Number of pages4288
    JournalJ. Phys. Condens. Matter
    Volume4
    Issue number18
    DOIs
    Publication statusPublished - 1992

    Keywords

    • Ferroelectricity (transitions of, in lightly doped barium titanate)
    • ferroelec barium titanate doping phase
    • tantalum doping barium titanate phase
    • strontium doping barium titanate phase
    • samarium doping barium titanate phase

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