Tag Archives: chemical physics

Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7

Ferroic materials are well known to exhibit heterogeneity in the form of domain walls. Understanding the properties of these boundaries is crucial for controlling functionality with external stimuli and for realizing their potential for ultra-low power memory and logic devices as well as novel computing architectures.*

In the article “Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7” K. A. Smith, E. A. Nowadnick, S. Fan, O. Khatib, S. J. Lim, B. Gao, N. C. Harms, S. N. Neal, J. K. Kirkland, M. C. Martin, C. J. Won, M. B. Raschke, S.-W. Cheong, C. J. Fennie, G. L. Carr, H. A. Bechtel and J. L. Musfeldt employ synchrotron-based near-field infrared nano-spectroscopy to reveal the vibrational properties of ferroelastic (90∘ ferroelectric) domain walls in the hybrid improper ferroelectric Ca3Ti2O7 . By locally mapping the Ti-O stretching and Ti-O-Ti bending modes, they reveal how structural order parameters rotate across a wall. Thus, they link observed near-field amplitude changes to underlying structural modulations and test ferroelectric switching models against real space measurements of local structure. This initiative opens the door to broadband infrared nano-imaging of heterogeneity in ferroics.*

NANOSENSORS™ Platinum Silicide PtSi-NCH AFM probes were used for the Near-field infrared spectroscopy. Atomic force and piezoforce imaging reveal the different orientations of directional order parameters and domain wall character, providing a physical playground for graph theory. *

Fig. 2 from: «Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7» K. A. Smith et al. 2019
Combining scanning techniques to locate domain walls. a, b Atomic force microscopic (AFM) images of the crystal surfaces showing the two ferroelastic domain walls of interest (at the edges of the dark blue stripes). These ferroelastic walls separate domains of different spontaneous strain and are also 90∘ ferroelectric walls. DW 1 and DW 2 refer to domain walls 1 and 2. Red arrows indicate direction and path of the line scans. The nano-spectroscopic line scans are taken perpendicular to the wall, and the contact angle from one domain to another is 90∘. c AFM topography of a smooth area near an identified surface defect (indicated by a green circle) and step edge of approximately 100 nm height (indicated with a red arrow) compared with d the piezoresponse force microscopic (PFM) image of the same area revealing the placement and orientation of the 180∘ ferroelectric domains, indicated by yellow(+) or blue(−) regions with black or white arrows to indicate the polarization direction. All of these structures are present at room temperature

*K. A. Smith, E. A. Nowadnick, S. Fan, O. Khatib, S. J. Lim, B. Gao, N. C. Harms, S. N. Neal, J. K. Kirkland, M. C. Martin, C. J. Won, M. B. Raschke, S.-W. Cheong, C. J. Fennie, G. L. Carr, H. A. Bechtel and J. L. Musfeldt
Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7
Nature Communications volume 10, Article number: 5235 (2019)
DOI: https://doi.org/10.1038/s41467-019-13066-9

Please follow this external link to read the full article: https://rdcu.be/b2rPq

Open Access: The article “Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7” by K. A. Smith, E. A. Nowadnick, S. Fan, O. Khatib, S. J. Lim, B. Gao, N. C. Harms, S. N. Neal, J. K. Kirkland, M. C. Martin, C. J. Won, M. B. Raschke, S.-W. Cheong, C. J. Fennie, G. L. Carr, H. A. Bechtel and J. L. Musfeldt is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

Nucleation in confinement generates long-range repulsion between rough calcite surfaces

Fluid-induced alteration of rocks and mineral-based materials often starts at confined mineral interfaces where nm-thick water films can persist even at high overburden pressures and at low vapor pressures. These films enable transport of reactants and affect forces acting between mineral surfaces. However, the feedback between the surface forces and reactivity of confined solids is not fully understood.*

In “Nucleation in confinement generates long-range repulsion between rough calcite surfaces» Joanna Dziadkowiec, Bahareh Zareeipolgardani, Dag Kristian Dysthe and Anja Røyne describe how they used the surface forces apparatus (SFA) to follow surface reactivity in confinement and measure nm-range forces between two rough calcite surfaces in NaCl, CaCl2, or MgCl2 solutions with ionic strength of 0.01, 0.1 or 1 M.*

Roughness evolution with time of single, unconfined calcite films in salt solutions was analyzed by Atomic Force Microscopy using NANOSENSORS™ uniqprobe qp-SCONT AFM probes to image the surfaces in contact mode.*

 Supplementary Information S8. showing the Atomic Force Microscopy (AFM)ALD films roughness characterization from «Nucleation in confinement generates long-range repulsion between rough calcite surfaces” by Joanna Dziadkowiec et al.:
 Figure S7 show the AFM height maps (A, B, E, F, G, J) and histograms of surface heights (C, D, H, I) of the initial set 1 (A-E) and set 2 (F-J) ALD calcite surfaces for two scan sizes of 15x15 μm2(A, C, F, H)and 2x2 μm2(B, D, E, G, I, J). The images E and J show 3D height maps of the B, G height maps, respectively

Supplementary Information S8. Atomic Force Microscopy (AFM)ALD films roughness characterization from «Nucleation in confinement generates long-range repulsion between rough calcite surfaces” by Joanna Dziadkowiec et al.:
Figure S7.AFM height maps (A, B, E, F, G, J) and histograms of surface heights (C, D, H, I) of the initial set 1 (A-E) and set 2 (F-J) ALD calcite surfaces for two scan sizes of 15×15 μm2(A, C, F, H)and 2×2 μm2(B, D, E, G, I, J). The images E and J show 3D height maps of the B, G height maps, respectively

*Joanna Dziadkowiec, Bahareh Zareeipolgardani, Dag Kristian Dysthe and Anja Røyne
Nucleation in confinement generates long-range repulsion between rough calcite surfaces
Nature, Scientific Reports, volume 9, Article number: 8948 (2019)
doi: https://doi.org/10.1038/s41598-019-45163-6

Please follow this external link for the full article: https://rdcu.be/bMhZb

Open Access: The article “Nucleation in confinement generates long-range repulsion between rough calcite surfaces” by Joanna Dziadkowiec, Bahareh Zareeipolgardani, Dag Kristian Dysthe and Anja Røyne is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/