Structure of Pb(Fe2/3W1/3)O3 single crystals with partial cation order

Ivanov, S.A.; Stash, A.I.; Riekehr, L.; Chen, Y.S.; Ye, Z.G.

Авторы: Ivanov S.A., Stash A.I., Riekehr L., Chen Y.S., Ye Z.G.
Журнал: Scientific reports
Том: 10
Номер: 1
Год издания: 2020
Издательство: Nature Publishing Group
Местоположение издательства: United Kingdom
Номер статьи: 14567
DOI: 10.1038/s41598-020-71438-4
Аннотация: Despite intensive studies on the complex perovskite Pb(Fe2/3W1/3)O3 (PFWO) relaxor, understandingthe exact nature of its multifunctional properties has remained a challenge for decades. In thiswork we report a comprehensive structural study of the PFWO single crystals using a combinationof synchrotron X-ray diffraction and high-resolution electron microscopy. The set of {h + ½, k + ½,l + ½} superlattice reflections was observed for the first time based on single-crystal synchrotronX-ray experiments (100–450 K) and transmission electron microscopy investigations, which indicatessome kind of B-cation ordering in PFWO which had been thought to be totally disordered. It wasfound that (1) the crystal structure of PFWO should be described by a partly ordered cubic perovskite(i.e. Fm − 3m), (2) the weak ferromagnetic properties and excess magnetic moment of PFWO can beunderstood based on non-random distribution of Fe cations between the 4a and 4b sites, and (3) thePb displacement disorder is present in this material and the cations are probably displaced along the<100> directions. The X-ray diffraction results of this investigation show that partial cation orderingindeed exists in PFWO, which makes it necessary to revisit the generally accepted interpretations ofthe results obtained up to date. In agreement with X-ray diffraction study the main results of TEMstudy include: (1) a long range order that can be described with the Fm − 3m symmetry is reliablydetected, (2) the coherence length of that long range order is in the order of 1–2 nm and (3) noremarkable chemical inhomogeneity is found in the tested PFWO crystal, excluding the possibility of acompositional ordering arising from substitutional defects in the perovskite structure.
Добавил в систему: Сташ Адам Игаркович

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Structure of Pb(Fe2/3W1/3)O3 single crystals with partial cation orderстатья

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