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  • Electric-field-induced non-ergodic relaxor to ferroelectric transition in ▫$BiFeO_3xSrTiO_3$▫ ceramics
    Oliveira, Leonardo Soares de ...
    While BiFeO3-based solid solutions show great promise for applications in energy conversion and storage, realizing this promise necessitates understanding the structure–property relationship in ... particular pertaining to the relaxor-like characteristics often exhibited by solid solutions with polar-to-non-polar morphotropic phase boundaries. To this end, we investigated the role of the compositionally-driven relaxor state in (100 − x)BiFeO3–xSrTiO3 [BFO–xSTO], via in situ synchrotron X-ray diffraction under bipolar electric-field cycling. The electric-field induced changes to the crystal structure, phase fraction and domain textures were monitored via the {111}pc, {200}pc, and 1/2{311}pc Bragg peaks. The dynamics of the intensities and positions of the (111) and (11[1 with combining macron]) reflections reveal an initial non-ergodic regime followed by long-range ferroelectric ordering after extended poling cycles. The increased degree of random multi-site occupation in BFO–42STO compared to BFO–35STO is correlated with an increase of the critical electric field needed to induce the non-ergodic-to-ferroelectric transition, and a decrease in the degree of domain reorientation. Although both compositions show an irreversible transition to a long-range ferroelectric state, our results suggest that the weaker ferroelectric response in BFO–42STO is related to an increase in ergodicity. This, in turn, serves to guide the development of BFO-based systems into promising platform for further property engineering towards specific capacitor applications.
    Vir: Journal of materials chemistry. C, Materials for optical and electronic devices [Elektronski vir]. - ISSN 2050-7534 (Vol. 11, iss. 21, Jun. 2023, str. 6902-6911)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 149592579

    Povezava(-e):

    https://pubs.rsc.org/en/content/articlelanding/2023/TC/D2TC05100A
    DOI

Vnos na polico