Sample chamber for synchrotron based <i>in-situ</i> X-ray diffraction experiments under electric fields and temperatures between 100 K and 1250 K

Nentwich, Melanie; Weigel, Tina; Richter, Carsten; Stöcker, Hartmut; Mehner, Erik; Jachalke, Sven; Новиков, Д. В.; Zschornak, Matthias; Meyer, Dirk C.

doi:10.1107/s1600577520014344

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…The dome material was chosen due to its high X-ray transmission properties compared to other widely available polymers. 26 Spectra for all samples on the library were acquired by moving the dome within the diffractometer using an x – y stage. For each sample spectra, a reference spectra recorded using an empty dome was subtracted.…”

Section: Methodsmentioning

confidence: 99%

Advancing high-throughput combinatorial aging studies of hybrid perovskite thin films via precise automated characterization methods and machine learning assisted analysis

Wieczorek,

Kuba,

Sommerhäuser

et al. 2024

J. Mater. Chem. A

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Section: Methodsmentioning

confidence: 99%

Advancing high-throughput combinatorial aging studies of hybrid perovskite thin films via precise automated characterization methods and machine learning assisted analysis

Wieczorek,

Kuba,

Sommerhäuser

et al. 2024

J. Mater. Chem. A

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“…Due to the large unit cell of YMn 2 O 5 and the high photon energy, the Renninger eect [58] of multiple diraction was a major issue contaminating the data. We performed an azimuthal scan (rotation about the normal of the diracting lattice plane) at each reection and each energy to eliminate contributions of the Renninger eect from the measured energy dependence [59] (more details SM Sec. S V).…”

Section: Synchrotron Experimentsmentioning

confidence: 99%

Picometer atomic displacements behind ferroelectricity in the commensurate low-temperature phase in multiferroic YMn2O5

Weigel,

Richter,

Nentwich

et al. 2024

Phys. Rev. B

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The material system YMn 2 O 5 has several low temperatures phases, where magnetism and ferroelectricity occur. Especially, the origin of ferroelectricity in the commensurate phase is an open question. Literature agrees upon a magnetically driven principal mechanism from changes in the Mn spin conguration, which may be based either on magnetostriction due to symmetric exchange, the antisymmetric inverse Dzyaloshinskii-Moriya interaction or a combination of the two. These mechanisms are accompanied by specic atomic displacements of ions in the structure. The space group P bam (55) of the paraelectric phase does not allow the respective polar displacements and a renement of the charge structure in a lower symmetric phase has not been successful so far, mostly because conventional structure analysis lacks the sensitivity required to resolve the expected positional displacements. We applied the new Resonantly Suppressed Diraction (RSD) method, which is sensitive to minuscule structural changes in the sub-pmrange, in order to resolve potential ionic displacements within a polar space group and shed new light on this controversial discussion.We measured the energy dependent RSD spectra of carefully selected reections above and below the phase transition temperature T CM = 39 K. With the data above T CM , we rened the static and dynamic displacements of the paraelectric phase to receive an improved initial model for the structural characterization of the ferroelectric phase. Subsequently, we rened 50 static displacement parameters in the lower symmetric space group P b2 1 m, which allows polarization in b-direction and present the rst structure renement of the commensurate phase in YMn 2 O 5 .We found a signicant displacement of Mn ions and the O partial structure, which results in a calculated absolute spontaneous polarization P s = (1.3 ± 0.4) mC m −2 , in good agreement with a measured value P s = (0.88 ± 0.06) mC m −2 . With the presented investigation, we nally conrm that P s has an ionic contribution and is predominately induced by magnetostriction.

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“…However, especially for hard X-rays, large unit cells, and weak or even 'forbidden' reflections, the measured intensities can be dominated by MBD (Gabrielyan & Kohn, 1981), also called the Renninger effect (Newville, 2021) or Umweganregung. The investigation of the fine structure oscillations in resonant elastic X-ray spectroscopy (REXS) experiments (Richter et al, 2018;Weigel et al, 2023;Nentwich et al, 2016) suffers particularly from these effects (see Section 2), which have been either overlooked or perceived as disruptive and hence avoided (Laligant et al, 1989;Baruchel, 1993;Massa, 2007;Petcov, 1989). Lately, increasing concomitant interpretation facilitates additional information about the material (Hayashi et al, 1999;dos Santos et al, 2019;Borcha et al, 2017;Mikula et al, 2021;Freitas et al, 2007;Chang, 2004Chang, , 1982Weckert & Hu ¨mmer, 1997).…”

Section: Introductionmentioning

confidence: 99%

Treatment of multiple-beam X-ray diffraction in energy-dependent measurements

Nentwich,

Zschornak,

Weigel

et al. 2024

J Synchrotron Radiat

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During X-ray diffraction experiments on single crystals, the diffracted beam intensities may be affected by multiple-beam X-ray diffraction (MBD). This effect is particularly frequent at higher X-ray energies and for larger unit cells. The appearance of this so-called Renninger effect often impairs the interpretation of diffracted intensities. This applies in particular to energy spectra analysed in resonant experiments, since during scans of the incident photon energy these conditions are necessarily met for specific X-ray energies. This effect can be addressed by carefully avoiding multiple-beam reflection conditions at a given X-ray energy and a given position in reciprocal space. However, areas which are (nearly) free of MBD are not always available. This article presents a universal concept of data acquisition and post-processing for resonant X-ray diffraction experiments. Our concept facilitates the reliable determination of kinematic (MBD-free) resonant diffraction intensities even at relatively high energies which, in turn, enables the study of higher absorption edges. This way, the applicability of resonant diffraction, e.g. to reveal the local atomic and electronic structure or chemical environment, is extended for a vast majority of crystalline materials. The potential of this approach compared with conventional data reduction is demonstrated by the measurements of the Ta L 3 edge of well studied lithium tantalate LiTaO3.

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Sample chamber for synchrotron based in-situ X-ray diffraction experiments under electric fields and temperatures between 100 K and 1250 K

Cited by 5 publications

References 37 publications

Advancing high-throughput combinatorial aging studies of hybrid perovskite thin films via precise automated characterization methods and machine learning assisted analysis

Advancing high-throughput combinatorial aging studies of hybrid perovskite thin films via precise automated characterization methods and machine learning assisted analysis

Picometer atomic displacements behind ferroelectricity in the commensurate low-temperature phase in multiferroic YMn2O5

Treatment of multiple-beam X-ray diffraction in energy-dependent measurements

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