English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

The effect of a third type of B-site cation on the temperature- and pressure-induced structural changes in ABO 3 -type relaxors has been studied by in-situ Raman scattering and X-ray diffraction on 0.72PbSc 0.5 Ta 0.5 O 3 —0.28PbSc 0.5 Nb 0.5 O 3  (PSTN) and 0.78PbSc 0.5 Ta 0.5 O 3 —0.22PbSnO 3  (PSTS). The incorporation of Nb into the PST matrix is an isovalent substitution for Ta 5+  on the ferroelectrically active B-site, whereas the incorporation of Sn 4+  is a coupled aliovalent substitution for both types of B-cations in the host system. Both PSTN and PSTS exhibit the characteristic temperature  T *, which for PSTS is shifted to slightly lower temperatures. The incorporation of Nb and Sn into the PST matrix smears the transformation processes near and below  T * and suppresses the ferroelectric long-range order at low temperatures. Both PSTN and PSTS exhibit a continuous pressure-induced phase transition. The high-pressure phases have the same structural features as for pure PST: suppressed B-cation off-centre shifts, enhancement of coupled Pb—O ferroic species, and long-range order of anti-phase tilts of the BO 6  octahedra. Nb-doping shifts the critical pressure  p  c  from 1.9 GPa for pure PST to 2.5 GPa, whereas Sn-doping lowers  p  c  to 1.3 GPa. The incorporation of both Nb and Sn decreases the degree of the overall pressure-induced structural distortion, with the effect of Sn being more pronounced than Nb. The dilution of the B-site cation system with Sn 4+  results in local electric and elastic fields which reduce the coherence between nanoregions with anti-phase octahedral tilting and shifts the pressure at which long-range order of the tilts occurs to ∼4 GPa.

Transformation processes in relaxor ferroelectric PbSc 0.5 Ta 0.5 O 3 heavily doped with Nb and Sn