skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Microstructural features and domain formation in (Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites

Abstract

The formation and co-existence of crystallographically modulated and non-modulated regions in (Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites is reviewed, particularly the dependence on local composition. It is shown that perturbations of the average fresnoite structure, determined from appreciable single crystals, are in some cases better described as nanometric domain intergrowths where departures from ideal stoichiometry are characteristics of incommensuration, while modulation is absent from volumes that are less perturbed chemically. Evidence for this differentiation is obtained from selected area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) images. The domains are readily distinguished by their unique contrast in bright field electron micrographs. Fourier reconstructions of HRTEM images collected from areas with darker contrast show that modulation can change within relatively small volumes. Nearby areas with lighter contrast were found by SAED to be free of structural disorder and incommensurate reflections. - Graphical abstract: Fresnoite layers contain SiO{sub 4} and TiO{sub 5} polyhedra that undergo run rotation and tilting to create 3D, 4D and 5D structural modulations that can be directly observed by electron diffraction and high resolution imaging. Highlights: {yields}(Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites contain commensurate and incommensurate domains. > Departures in stoichiometry promote the formation of nanostructured domains.more » > Domains formation may provide a means for reducing strain in single crystals.« less

Authors:
 [1];  [2];  [1];  [3]
  1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
  2. Laboratoire de Mineralogie et Cosmchimie du Museum National d'Historie Naturelle, UMR-CNRS 7202, CP 52, 61 Rue Buffon, 75005 Paris (France)
  3. (Australia)
Publication Date:
OSTI Identifier:
21580148
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 184; Journal Issue: 7; Other Information: DOI: 10.1016/j.jssc.2011.05.009; PII: S0022-4596(11)00230-1; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DISTURBANCES; ELECTRON DIFFRACTION; ELECTRONS; IMAGES; LAYERS; MICROSTRUCTURE; MODULATION; MONOCRYSTALS; NANOSTRUCTURES; PERTURBATION THEORY; RESOLUTION; ROTATION; SILICATES; SILICON OXIDES; STOICHIOMETRY; TRANSMISSION ELECTRON MICROSCOPY; CHALCOGENIDES; COHERENT SCATTERING; CRYSTALS; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTARY PARTICLES; FERMIONS; LEPTONS; MICROSCOPY; MOTION; OXIDES; OXYGEN COMPOUNDS; SCATTERING; SILICON COMPOUNDS

Citation Formats

Wong, Chui Ling, E-mail: wong0233@e.ntu.edu.sg, Ferraris, Cristiano, White, T.J., and Centre for Advanced Microscopy, The Australian National University, Canberra ACT 0200. Microstructural features and domain formation in (Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites. United States: N. p., 2011. Web. doi:10.1016/j.jssc.2011.05.009.
Wong, Chui Ling, E-mail: wong0233@e.ntu.edu.sg, Ferraris, Cristiano, White, T.J., & Centre for Advanced Microscopy, The Australian National University, Canberra ACT 0200. Microstructural features and domain formation in (Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites. United States. doi:10.1016/j.jssc.2011.05.009.
Wong, Chui Ling, E-mail: wong0233@e.ntu.edu.sg, Ferraris, Cristiano, White, T.J., and Centre for Advanced Microscopy, The Australian National University, Canberra ACT 0200. Fri . "Microstructural features and domain formation in (Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites". United States. doi:10.1016/j.jssc.2011.05.009.
@article{osti_21580148,
title = {Microstructural features and domain formation in (Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites},
author = {Wong, Chui Ling, E-mail: wong0233@e.ntu.edu.sg and Ferraris, Cristiano and White, T.J. and Centre for Advanced Microscopy, The Australian National University, Canberra ACT 0200},
abstractNote = {The formation and co-existence of crystallographically modulated and non-modulated regions in (Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites is reviewed, particularly the dependence on local composition. It is shown that perturbations of the average fresnoite structure, determined from appreciable single crystals, are in some cases better described as nanometric domain intergrowths where departures from ideal stoichiometry are characteristics of incommensuration, while modulation is absent from volumes that are less perturbed chemically. Evidence for this differentiation is obtained from selected area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) images. The domains are readily distinguished by their unique contrast in bright field electron micrographs. Fourier reconstructions of HRTEM images collected from areas with darker contrast show that modulation can change within relatively small volumes. Nearby areas with lighter contrast were found by SAED to be free of structural disorder and incommensurate reflections. - Graphical abstract: Fresnoite layers contain SiO{sub 4} and TiO{sub 5} polyhedra that undergo run rotation and tilting to create 3D, 4D and 5D structural modulations that can be directly observed by electron diffraction and high resolution imaging. Highlights: {yields}(Ba,Sr){sub 2}TiSi{sub 2}O{sub 8} fresnoites contain commensurate and incommensurate domains. > Departures in stoichiometry promote the formation of nanostructured domains. > Domains formation may provide a means for reducing strain in single crystals.},
doi = {10.1016/j.jssc.2011.05.009},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 7,
volume = 184,
place = {United States},
year = {2011},
month = {7}
}